PUBLICATIONS FROM THE ADB BRANCH

2023

  1. Das, S. S., Kishore Kumar, K.,Subrahmanyam, K. V., Venkat Ratnam,M., Suneeth, K. V., Sunilkumar, S. V., et al., Impact of annular solar eclipse on the trace gases and dynamics of the lower and middle atmosphere: Results inferred from an integrated campaign “Suryagrahan-2019”. Earth and Space Science, 10, e2023EA003044. https://doi.org/10.1029/2023EA003044, 2023.

  2. Prijith S. S. and K. Kishore Kumar, 2023, On the genesis of multi-peak vertical structure of quasi-two-day waves in the mesosphere lower thermosphere, Earth, Planets and Space (2023) 75:119, https://doi.org/10.1186/s40623-023-01875-8

  3. Jayadev Pradeep and S. V. Sunilkumar, "Solar Occultation Experiments (SOE) in the Venusian Atmosphere: Effect of Orbital Parameters on the Spatiotemporal Distribution of Measurements", Royal Astronomical Society Techniques and Instruments (RASTAI), 2, 324-344, https://doi.org/10.1093/rasti/rzad019, 2023.
  4. Veenus, V., S. S. Das, and L. M. David, "Ozone changes due to sudden stratospheric warming-induced variations in the intensity of Brewer-Dobson Circulation: A composite analysis using observations and chemical-transport model", Geophysical Research Letters, 50, e2023GL103353, https://doi.org/10.1029/2023GL103353, 2023.
  5. Prijith, S. S., & Kumar, K. K., "Investigation on the anomalous weakening of diurnal tides in the mesosphere-lower thermosphere", J. Geophys. Res., 128, https://doi.org/10.1029/2022JA030725, 2023.

2022

 

  1. Das Siddarth Shankar, K. N. Uma, K. V. Suneeth and V. Veenus, "Diurnal variability of lower and middle atmospheric water vapour over the Asian summer monsoon region: first results from COSMIC‑1 and TIMED‑SABER measurements", Climate Dynamics, 2022.
  2. Das, S.S., M.Venkat Ratnam, M. Durga Rao, and K.N.Uma, "Volume imaging of aspect sensitivity in VHF radar backscatters: First results inferred from the Advanced Indian MST radar (AIR)", International Journal of Remote Sensing, 4517-4540, 43 (12), https://doi.org/10.1080/01431161.2022.2111667, 2022.
  3. Jasmine, M. K., M. Aloysius, J. Reethu, C.P. Fathima, S.S. Prijith, M. Mohan, ‘Investigation on the role of aerosols on precipitation enhancement over Kerala during August 2018’, Atmospheric Environment, 279, 119101, 2022.
  4. Veenus, V., Siddarth Shankar Das, Bukya Sama, and K. N. Uma, 2022. "Assessment of COSMIC-2 radio occultation measured temperature and relative humidity with radiosonde observations over the Asian summer monsoon region", Remote Sensing Letters,13 (4), 394–405. 
  5. Emmanuel Maria, S.V. Sunilkumar, P.R. Satheesh Chandran, M. Muhsin, Spatio-temporal distribution of tropospheric water vapour over Arabian Sea and Equatorial Indian Ocean in boreal winter of 2018. Dynamics of Atmopsheres and Oceans, 97, 101285, 2022.
  6. Nandakumar, P., D. Jana, S. V. Sunilkumar , P.R. Satheesh Chandran, R. Vishnu, T. Das, Maria Emmanuel, G. Singh, S. Majumder, J. Y. Siddiqui, and A. Paul, "Validation of wind measurements from a 53 MHz ST Radar Pilot Array located at University of Calcutta with collocated radiosonde launches." Radio Science, 57, e2020RS007246, 2022.
  7. Prijith S. S., Sesha Sai, M.V.R., "Enhancement in free-tropospheric aerosol loading over India". Atmospheric Environment, 276, 2022.

2021

 

  1. Pramitha, N., K.K. Kumar and M.V. Ratnam, 2021. "Observations and model predictions of vertical wave-number spectra of gravity waves in the troposphere and lower stratosphere over a tropical station", Journal of Atmospheric and Solar-Terrestrial Physics. 
  2. Ranganayakulu, S.V., K. V. Subrahmanyam and A. Niranjan, A Novel Algorithm for Convective cell Identification and Tracking based on Optical Character Recognition Neural Network, Journal of Electromagnetic Waves and Applications, 2021.
  3. Satheesh Chandran P.R., S.V. Sunilkumar, M. Muhsin, M. Emmanuel, G. Ramkumar, P. R. Nair, "Effect of meteorology on the variability of ozone in the troposphere and lower stratosphere over a tropical station Thumba (8.5°N, 76.9°E)", Journal of Atmospheric and Solar-Terrestrial Physics.
  4. Subrahmanyam, K. V., C. Ramsenthil, A. Girach Imran, A. Chakravorty, R. Sreedhar, E. Ezhilrajan, D. Bala Subrahamanyam, Radhika Ramachandran, K. Kishore Kumar, M. Rajasekhar and C. S. Jha, Prediction of heavy rainfall days over a peninsular Indian station using the machine learning algorithms, J. Earth. Sys. Sci., 2021

2020

 

  1. Kumar,K.K., K. V. Subrahmanyam, C. P. Kumar, J. Shanmugasundari, N. Koushik, R. P. Ajith, L Girija Devi, "C-band dual-polarization Doppler weather
    radar at Thumba (8.50 N, 770 E): initial results and validation," J. Appl. Remote Sens. 14(4), 044509 (2020), doi: 10.1117/1.JRS.14.044509.

  2. Subrahmanyam, K. V. and N.V.P. Kirankumar, Characteristics of Mesoscale Convective Systems over the Indian summer monsoon using IRBRT data, Science Spectrum: Quarterly Journal of AP Akedamy of Science, ISSN no. 2455-5053.2020, 2020.

  3. Kumar, K. K. Is Mesospheric Quasi-Biennial Oscillation Ephemeral?. Geophysical Research Letters, e2020GL091033. https://doi.org/10.1029/2020GL091033

  4. Ramesh, K., Smith, A. K., Garcia, R. R., Marsh, D. R., Sridharan, S., & Kishore Kumar, K. (2020). Long-term variability and tendencies in migrating diurnal tide from WACCM6 simulations during 1850–2014. Journal of Geophysical Research: Atmospheres, 125, e2020JD033644. https://doi.org/10.1029/2020JD033644

  5. Ramesh, K., Smith, A. K., Garcia, R. R., Marsh, D. R., Sridharan, S., & Kishore Kumar, K. (2020). Long-term variability and tendencies in middle atmosphere temperature and zonal wind from WACCM6 simulations during 1850–2014. Journal of Geophysical Research: Atmospheres, 125, e2020JD033579. https://doi.org/10.1029/2020JD033579

  6. Kumar, K. N., Phanikumar, D. V., Sharma, S., Basha, G., Naja, M., Ouarda, T. B., & Ratnam, M. V. (2019). Influence of tropical-extratropical interactions on the dynamics of extreme rainfall event: A case study from Indian region. Dynamics of Atmospheres and Oceans, 85, 28- 40. https://doi.org/10.1016/j.dynatmoce.2018.12.002

  7. Jose, L., Vineeth, C., Pant, T. K., & Kumar, K. K. (2020). Response of the equatorial ionosphere to the annular solar eclipse of 15 January 2010. Journal of Geophysical Research: Space Physics, 125(8), e2019JA027348. https://doi.org/10.1029/2019JA027348

  8. Uma, K.N., S.S. Das, M.V.Ratnam, and K.V. Suneeth, 2021: Assessment of vertical air motion among reanalyses and qualitative comparison with direct VHF radar measurements over the two tropical stations, Atmospheric Chemistry and Physics (in-press), doi: 10.5194/acp-2020-18.

  9. Emmanuel, M., Sunilkumar, S. V., Muhsin, M., Chandran, P. S., Parameswaran, K., Kumar, B. S., ... & Nagendra, N. (2020). Effect of monsoon dynamics and deep convection on the upper troposphere lower stratosphere water vapour over Indian monsoon region. Atmospheric Research, 105336, https://doi.org/10.1016/j.atmosres.2020.105336
  10. Das, S.S., G. Ramkumar, N. Koushik, D. J. Murphy, I. A. Girach,  K. V. Suneeth, K.V. Subrahmanyam,  V. K. Soni, Vivek Kumar, and M. Nazeer (2020), Multiplatform observations of stratosphere-troposphere exchange over the Bharati (69.41oS, 76oE), Antarctica during ISEA-35, Journal  of Solar and Terrestrial Physics, 211, 105455. https://doi.org/10.1016/j.jastp.2020.105455
  11. Krishnaprasad, C., Thampi, S. V., Bhardwaj, A., Lee, C. O., Kumar, K. K., & Pant, T. K. (2020). Recurrent Solar Energetic Particle Flux Enhancements Observed near Earth and Mars. The Astrophysical Journal, 902(1), 13. https://doi.org/10.3847%2F1538-4357%2Fabb137

  12. Vishnu, R., Y. Bhavani Kumar & Anish Kumar M. Nair (2020), An Investigation of the Elevated Aerosol Layer Using a Polarization Lidar Over a Tropical Rural Site in India, Boundary-Layer Meteorology, https://doi.org/10.1007/s10546-020-00573-2

  13. Boreddy S. K. R., Hegde P., Aswini A. R., Girach I. A., Koushik N., Nalini K. (2020), Impact of ice-free oases on particulate matter over the East Antarctic: Inferences from the carbonaceous, water-soluble species and trace metals", Polar Science, 24, 100520, http://dx.doi.org/10.1016/j.polar.2020.100520

  14. Koushik, N., Kumar, K. K., Vineeth, C., Ramkumar, G., & Subrahmanyam, K. V. (2020). Meteor radar observations of lunar semidiurnal oscillations in the
    mesosphere lower thermosphere over low and equatorial latitudes and their variability during sudden stratospheric warming events. Journal of Geophysical Research: Space Physics, 125, e2019JA027736. https://doi.org/ 10.1029/2019JA027736

  15. Pramitha, M., Kumar, K. K., Ratnam, M. V., Praveen, M., & Rao, S. V. B. Gravity Wave Source Spectra Appropriation for Mesosphere Lower Thermosphere using Meteor Radar Observations and GROGRAT Model Simulations. Geophysical Research Letters, e2020GL089390.https://doi.org/10.1029/2020GL089390

  16. Jose, L., Vineeth, C., Pant, T. K., & Kumar, K. K. (2020). Response of the Equatorial Ionosphere to the Annular Solar Eclipse of 15 January 2010. Journal of Geophysical Research: Space Physics, 125(8), e2019JA027348. https://doi.org/10.1029/2019JA027348

  17. Subrahmanyam, K. V. and K. Kishore Kumar, The vertical structure of latent heating and its association with cloud types during the Indian summer monsoon, REMOTE SENSING LETTERS, https://doi.org/10.1080/2150704X.2020.1820615, 2020

  18. Subrahmanyam, K. V., and Sruthy Rose Baby, C-band Doppler weather radar observations during the passage of tropical cyclone ‘Ockhi’, Natural Hazards, 2020, https://doi.org/10.1007/s11069-020-04268-2

  19. Subrahmanyam, K. V. and N.V.P. Kirankumar, Characteristics of Mesoscale Convective Systems over the Indian summer monsoon using IRBRT data, Science Spectrum: Quarterly Journal of AP Akedamy of Science,ISSN no. 2455-5053.2020 (in-press)
  20. Das, S.S., K. V. Suneeth, M. V. Ratnam, K. N. Uma, M. D. Rao, and A. N. Babu (2020), Long-term observations of stratosphere-troposphere exchange using MST Radar and Aura MLS measurements over a tropical station Gadanki, Radio Science, https://doi.org/10.1029/2019RS006969.
  21. Suneeth, K.V., S.S.Das (2020), Zonally resolved water vapour coupling with tropical tropopause temperature: Seasonal and interannual variability, and influence of the Walker circulation, Climate Dynamics, https://doi.org/10/1007/s00328-020-05255-w.

  22. Koushik, N., K.K. Kumar, Geetha Ramkumar, K. V. Subrahmanyam, G. Kishore Kumar, W. K. Hocking (2020), Maosheng He & Ralph Latteck Planetary waves in the mesosphere lower thermosphere during stratospheric sudden warming: observations using a network of meteor radars from high to equatorial latitudes. Climate Dynamics . https://doi.org/10.1007/s00382-020-05214-5

  23. Das, S. S., and K.V. Suneeth (2020), Seasonal and interannual variations of water vapor in the upper troposphere and lower stratosphere over the Asian Summer Monsoon region- in perspective of the tropopause and ocean-atmosphere interactions, Journal of Atmospheric and Solar-Terrestrial Physics, doi : 10.1016/j.jastp.2020.105244
  24. Kumar., A. H. and S. V. Sunilkumar (2020), Assessment of INSAT-3D Retrieved Temperature and Water Vapour With Collocated Radiosonde Measurements Over Indian Region, IEEE Transactions on Geoscience and Remote Sensing.doi : 10.1109/TGRS.2019.2960277
  25. Koushik, N., K. K. Kumar, Tarique A. Siddiqui (2020), Westward Acceleration of Tropical Stratopause Zonal Winds during Major Sudden Stratospheric Warming Events, Geophyical Research Letters, https://doi.org/10.1029/2019GL086857.
  26. Nair A., S.S.Das,A. Thomas, C. Sarangi, V.P. Kanawade (2020), Role of Cyclone “Ockhi” in the re-distribution of aerosols and its impact on the precipitation over the Arabian Sea, Atmospheric Research, 235, https://doi.org/10.1016/j.atmosres.2019.104797.
  27. Muhsin, M., S.V. Sunilkumar, M. Venkat Ratnam,K. Parameswaran, K. Mohankumar, S. Mahadevan, K. Murugadass, P.M. Muraleedharan, B. Suneel Kumar, N. Nagendra, Maria Emmanuel, P.R.Satheesh Chandran, N. Koushik, Geetha Ramkumar, B.V.Krishna Murthy (2020),Contrasting features of tropospheric turbulence over the Indian peninsula,Journal of Atmospheric and Solar-Terrestrial Physics,197,https://doi.org/10.1016/j.jastp.2019.105179.

 

2019

 

  1. Subrahmanyam, K. V. and K. Kishore Kumar (2020), Multi-Layered Cloud Distribution Over Tropical Station Using Radiosonde Humidity Observations and CloudSat Measurements, Environment and Natural Resources Research, https://doi.org/10.5539/enrr.v9n3p9 .
  2. Subrahmanyam, Kandula K.V., Karanam Kishore Kumar & Nelli Narendra Reddy (2019): New Insights into the Convective System Characteristics Over the Indian Summer Monsoon Region Using Space-Based Passive and Active Remote Sensing Techniques, IETE Technical Review, DOI: 10.1080/02564602.2019.1593890
  3. Koushik, N., K. K. Kumar, K. V. Subrahmanyam, G. Ramkumar, I. A. Girach , M. Santosh, K. Nalini, M. Nazeer, P. R. Shreedevi (2019), Characterization of inertia gravity waves and associated dynamics in the lower stratosphere over the Indian Antarctic station, Bharati (69.4°S, 76.2°E) during austral summers, Climate Dynamics, https://doi.org/10.1007/s00382-019-04665-9
  4. Lavanya, S., N.V.P. Kirankumar, S. Aneesh, K.V. Subrahmanyam, S.Sijikumar (2019),Seasonal variation of raindrop size distribution over a coastal station Thumba: A quantitative analysis, Atmospheric Research, https://doi.org/10.1016/j.atmosres.2019.06.004.
  5. Mathew, S.S., Kumar, K.K. (2019), Characterization of the long-term changes in moisture, clouds and precipitation in the ascending and descending branches of the Hadley Circulation, Journal of Hydrology, doi: https://doi.org/10.1016/j.jhydrol.2018.12.047
  6. Niranjan Kumar, K., D.V. Phanikumar, S. Sharma, G. Basha, M. Naja, T.B.M.J. Ouarda, M.V. Ratnam, K. Kishore kumar (2019), Influence of tropical-extratropical interactions on the dynamics of extreme rainfall event: A case study from Indian region, Dynamics of Atmospheres and Oceans, Volume 85,Pages 28-40, https://doi.org/10.1016/j.dynatmoce.2018.12.002.
  7. Mridula N, T.K. Pant, Manju G, K V Subrahmanyam and K.K. Kumar (2019), On the role of F3 layers as well as solar flux in modulating the topside ionization over Indian region:an analysis, Journal of Atmospheric and Solar-Terrestrial Physics, 189, 52-64, doi:10.1016/j.jastp.2019.04.004

  8. Ojha N., Girach I., Sharma K., Nair P., Singh J., Sharma N., Singh N., Flemming J., Inness A., Subrahmanyam K. V. (2019), Surface ozone in the Doon Valley of the Himalayan foothills during spring", Environmental Science and Pollution Research, 2019. doi:10.1007/s11356-019-05085-2.

  9. Shukla, K.K., D Phanikumar, K. Niranjan Kumar, N. Singh, N. Ojha, R.K. Newsom, S. K. Sharma, V. Kotamarthi, K. Kishore Kumar (2019), Investigations of vertical wind variations at a mountain top in the Himalaya using Doppler Lidar observations and model simulations, Journal of Atmospheric and Solar-Terrestrial Physics, 183, 76-85, doi : 10.1016/j.jastp.2018.12.011.
  10. Uma, K. N., S.S. Das , K. K. Kumar, K. V. Subrahmanyam, G. Ramkumar ,(2019),Characterization of internal inertia gravity wave over the low latitude: results from the RONAC-2012 campaign, Meteorology and Atmospheric Physics, doi : 10.1007/s00703-019-0658-1.

 

2018

 

  1. Anurose, T. J., Subrahamanyam, D.B. & Sunilkumar, S.V. (2018), Two years observations on the diurnal evolution of coastal atmospheric boundary layer features over Thiruvananthapuram (8.5° N, 76.9° E), India, Theoretical & Applied Climatology, 131: 77. http://dx.doi.org/10.1007/s00704-016-1955-y
  2. Ajesh, A., T.K. Pant, C. Vineeth, N. Mridula, K.K. Kumar (2018), Vertical coupling between the mesopause region and sporadic-E layer during equatorial counter electrojet events – A case study, Adv. Space Res.,, 62,1787-1799
  3. Ando, H., Takagi, M., Fukuhara, T., Imamura, T., Sugimoto, N., Sagawa, H., Noguchi, K., Tellmann, S., Pšatzold, M., Hšausler, B., Murata, Y., Takeuchi, H., Yamazaki, A., Toda, T., Tomiki, A., Choudhary, R.K., Kishore Kumar, K., Ramkumar, G., Antonita, M., (2018), Local time dependence of the thermal structure in the Venusian equatorial upper atmosphere: Comparison of Akatsuki radio occultation measurements and GCM results, Journal of Geophysical Research: Planets, https://doi.org/10.1029/2018JE005640
  4. Das, S.S., K.V.Suneeth, , M.V.Ratnam, I.A. Girach and S.K.Das (2018) Upper tropospheric ozone transport from the sub-tropics to tropics over the Indian region during Asian summer monsoon, Climate Dynamics. https://doi.org/10.1007/s00382-018-4418-6

  5. Das, S.K., S.S.Das, K. Saha, U.V. M. Krishna, K.K. Dania (2018), Investigation of Kelvin-Helmholtz Instability in the boundary layer using Doppler lidar and radiosonde data, 202, 105-111, Atmospheric Research, https://doi.org/10.1016/j.atmosres.2017.11.013

  6. Emmanuel, Maria, S. V. Sunilkumar , M. Muhsin, B. Suneel Kumar, N. Nagendra, P. R. Satheesh Chandran, Geetha Ramkumar, and K. Rajeev, (2018), Intercomparison of Cryogenic Frost-Point Hygrometer Observations With Radiosonde, SAPHIR, MLS, and Reanalysis Datasets Over Indian Peninsula, IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, http://dx.doi.org/10.1109/TGRS.2018.2834154.
  7. Emmanuel, M., S.V. Sunilkumar, M. Venkat Ratnam, M. Muhsin, K. Parameswaran, B.V. Krishna Murthy (2018), Diurnal variation of the tropospheric water vapour over a coastal and an inland station in Southern Indian Peninsula, J. Atmos. Sol.-Terr. Phys., 179, 11-21, http://dx.doi.org/10.1016/j.jastp.2018.06.007
  8. Gogoi M.M., Babu S.S., Pandey S.K., Nair V.K., Vaishya A., Girach I., Koushik N. (2018), Snow Darkening due to Black Carbon in the Arctic and the Antarctic, Polar Science, http://dx.doi.org/10.1016/j.polar.2018.03.002.
  9. Hemanth Kumar, A, M. Venkat Ratnam, S.V. Sunilkumar, K. Parameswaran, B.V. Krishna Murthy (2018), Cross tropopause flux observed at sub-daily scales over the south Indian monsoon regions, Atmospheric Research, 201, 72-85,https://doi.org/10.1016/j.atmosres.2017.10.017.
  10. Koushik, N & K.K.Kumar, Ramkumar, Geetha & Subrahmanyam, Kandula. (2018). Response of equatorial and low latitude mesosphere lower thermospheric dynamics to the northern hemispheric sudden stratospheric warming events. Journal of Atmospheric and Solar-Terrestrial Physics. http://dx.doi.org/10.1016/j.jastp.2018.01.021.
  11. Mathew, Sneha Susan & Karanam Kishore Kumar (2018), On the role of precipitation latent heating in modulating the strength and width of the Hadley circulation, Theoretical and Applied Climatology, http://dx.doi.org/10.1007/s00704-018-2515-4.
  12. Mathew Sneha Susan and Karanam Kishore Kumar (2018), Estimation of Zonally Resolved Edges of the Tropical Belt Using GPS-RO Measurements, IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING, http://dx.doi.org/10.1109/JSTARS.2018.2828342.
  13. Muhsin, M., Sunilkumar, S. V., Venkat Ratnam, M., Krishna Murthy, B. V., & Parameswaran, K. (2018). Seasonal and diurnal variations of tropical tropopause layer (TTL) over the Indian peninsula. Journal of Geophysical Research,122. https://doi.org/10.1002/2017JD027056.
  14. Muhsin, M., S.V. Sunilkumar, M. Venkat Ratnam, K. Parameswaran, B.V. Krishna Murthy, Maria Emmanuel (2018), Effect of convection on the thermal structure of the troposphere and lower stratosphere including the tropical tropopause layer in the South Asian monsoon region, Journal of Atmospheric and Solar-Terrestrial Physics, 169, 52-65, https://doi.org/10.1016/j.jastp.2018.01.016.
  15. Premkumar, B., K. Chenna Reddy, G. Yellaiah, K. Kishore Kumar (2018), Seasonal variations in vertical distribution of meteor decay time as observed from meteor radars at 8.5°N and 80°N, Adv. Space Res., https://doi.org/10.1016/j.asr.2018.11.019.
  16. Subrahmanyam, Kandula & K.K.Kumar & D. Tourville, Natalie, (2018), CloudSat Observations of Three-Dimensional Distribution of Cloud Types in Tropical Cyclones. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing. PP. 339-344. http://dx.doi.org/10.1109/JSTARS.2017.2786666.
  17. Subrahmanyam, Kandula Venkata, Karanam Kishore Kumar (2018), Vertical structure of stratocumulus clouds and associated dynamics over the Arabian Sea during Indian summer monsoon season, J. Appl. Remote Sens. 12(1), 016018, http://dx.doi.org/10.1117/1.JRS.12.016018.

 

2017

 

  1. Das, S. K., S.S.Das, K. Saha, U.V.M. Krishna, and K. K. Dani (2017), Investigation of Kelvin-Helmholtz Instability in the boundary layer using Doppler lidar and radiosonde data, Atmospheric Research, 202, 105-111, doi : 10.1016/j.atmosres.2017.11.013.
  2. Selvaraj D, A.K. Patra, S. Sathishkumar and K. K. Kumar and D.N. Rao. (2016). On the governing dynamics of the VHF radar echoes from the mesosphere and collision dominated lower E region over Gadanki (13.5°N, 79.2°E). Journal of Geophysical Research: Space Physics. . 10.1002/2016JA023297.
  3. Guha, Anirban, Kumarjit Saha, Barin K De, K. V. Subrahmanyam, Shreedevi P. R. (2017), Space weather effects on lower ionosphere: First investigation from Bharati station during 34th Indian scientific expedition to Antarctica, Advances in Space Research.
  4. Kumar, K.K. & Mathew, Sneha & Subrahmanyam, Kandula. (2017). Anomalous tropical planetary wave activity during 2015/2016 quasi biennial oscillation disruption. Journal of Atmospheric and Solar-Terrestrial Physics. . 10.1016/j.jastp.2017.12.004.
  5. Kumar, K.K. & Subrahmanyam, Kandula & Mathew, Sneha & Koushik, N & Ramkumar, Geetha. (2017). Simultaneous observations of the quasi 2-day wave climatology over the low and equatorial latitudes in the mesosphere lower thermosphere. Climate Dynamics. 1-13. 10.1007/s00382-017-3916-2.
  6. Muhsin, M., Sunilkumar, S. V., Venkat Ratnam, M., Krishna Murthy, B. V., & Parameswaran, K. (2017). Seasonal and diurnal variations of tropical tropopause layer (TTL) over the Indian peninsula. Journal of Geophysical Research: Atmospheres, 122, 12,672–12,687. https://doi.org/10.1002/2017JD027056
  7. Mehta, S. K., Ratnam, M. V., Sunilkumar, S. V., Rao, D. N., and Krishna Murthy, B. V.: Diurnal variability of the atmospheric boundary layer height over a tropical station in the Indian monsoon region, Atmos. Chem. Phys., 17, 531-549, https://doi.org/10.5194/acp-17-531-2017, 2017.
  8. Narukull, Venkateswara Rao & Madineni, Venkat Ratnam & Vedavathi, C & Tsuda, Toshitaka & Krishna Murthy, B.V. & Sundararaman, Sathishkumar & Gurubaran, Subramanian & kishore kumar, Karanam & Subrahmanyam, Kandula & Vijaya Bhaskara Rao, S. (2016). Seasonal, inter-annual and solar cycle variability of the quasi two day wave in the low-latitude mesosphere and lower thermosphere. Journal of Atmospheric and Solar-Terrestrial Physics. 152. . 10.1016/j.jastp.2016.11.005.
  9. Subrahmanyam, K.V. & Kumar, K.K.(2017) CloudSat observations of multi layered clouds across the globe, Climate Dynamics, 49: 327. https://doi.org/10.1007/s00382-016-3345-7
  10. Suneeth, K.V., Siddarth Shankar Das, and S. K. Das (2017), Diurnal variability of the global tropical tropopause: results inferred from COSMIC observations, Climate Dynamics, 49,3277-3292, doi : 10.1007/s00382-016-3512-x.
  11. Sunilkumar, S. V., M. Muhsin, M. Venkat Ratnam, K. Parameswaran, B. V. Krishna Murthy, and M. Emmanuel (2017), Boundaries of tropical tropopause layer (TTL): A new perspective based on thermal and stability profiles, J. Geophys. Res. Atmos., 122, 741–754, doi:10.1002/2016JD025217.
  12. Vineeth, C & Neelakantan, Mridula & Muralikrishna, Polinaya & kishore kumar, Karanam & Pant, Tarun. (2016). First observational evidence for the connection between the meteoric activity and occurrence of equatorial counter electrojet. Journal of Atmospheric and Solar-Terrestrial Physics. 147. 71-75. 10.1016/j.jastp.2016.07007.
  13. Yadav, Sneha & Pant, Tarun & Choudhary, Raj & Vineeth, C & Sunda, Surendra & kishore kumar, Karanam & Radhakrishna, Shreedevi & Mukherjee, S. (2017). Impact of Sudden Stratospheric Warming of 2009 on the Equatorial and Low-Latitude Ionosphere of the Indian Longitudes: A Case Study. Journal of Geophysical Research: Space Physics. . 10.1002/2017ja024392.

2016

 

  1. Das, S.S., M. V. Ratnam, K. N. Uma, K. V. Subrahmanyam, I.A.Girach, A. K. Patra,S. Aneesh, K.V. Suneeth, K. K. Kumar, A.P.Kesarkar, S. Sijikumar and G. Ramkumar (2016),Geetha Ramkumar, Influence of Tropical Cyclones on Tropospheric Ozone: Possible Implications (2016), Atmospheric Chemistry and Physics, 16, 1-11, doi : 10.5194/acp-16-1-2016.
  2. Das, S.S., M. V. Ratnam, K. N. Uma, A. K. Patra, K. V. Subrahmanyam, I. A. Girach, K.V. Suneeth, K. K. Kumar and G. Ramkumar (2016), Stratospheric intrusion into the troposphere during the tropical cyclone Nilam (2012), Quarterly Journal of Royal Meteorological Society,doi: 10.1002/qj.2810.
  3. John, S.R., and K. K.Kumar (2016), HIRDLS observations of global gravity wave absolute momentum fluxes: A wavelet based approach, Journal of Atmospheric and Solar-Terrestrial Physics, 138,4-86, ISSN 1364-6826, http://dx.doi.org/10.1016/j.jastp.2015.12.004.
  4. John, S.R., K.K. Kumar (2016), Global normal mode planetary wave activity: a study using TIMED/SABER observations from the stratosphere to the mesosphere-lower thermosphere, Climate Dynamics, doi :10.1007/s00382-016-3046-2.
  5. Mathew, S.S., K.K.Kumar , K. V.Subrahmanyam (2016), Hadley cell dynamics in Japanese Reanalys is-55 dataset: evaluation using other reanalysis datasets and global radiosonde network observations, Climate Dynamics, doi : 10.1007/s00382-016-3051-5.
  6. Muhsin M, Sunilkumar S. V, M. Venkat Ratnam, K. Parameswaran, B. V. Krishna Murthy, Geetha Ramkumar, K. Rajeev, "Diurnal variation of turbulence in the troposphere and lower stratosphere derived from simultaneous radiosonde observations at two tropical stations, in the Indian Peninsula", Atmospheric Research, (2016) doi:10.1016/j.atmosres.2016.04.021, 180, 12-23.
  7. Subrahmanyam, K. V., Kishore Kumar, K., Kiran Kumar, N. V. P. and Viswanathan, G. (2016), Evaluation of Doppler weather radar MEGHA-2700 observations using Gematronik Doppler weather radar and TRMM Precipitation Radar. Met. Apps, 23: 470–476. doi:10.1002/met.1571
  8. Subrahmanyam, K.V. and Karanam Kishore Kumar (2016), TRMM observations of Latent heat distribution over the Indian summer monsoon region and associated dynamics, Proc. of SPIE Vol. 9876, 98762W, doi:10.1117/12.2223905
  9. Sunilkumar, S.V., M. Muhsin, Maria Emmanuel, Geetha Ramkumar, K. Rajeev, S. Sijikumar, Balloon-borne cryogenic frost-point hygrometer observations of water vapour in the tropical upper troposphere and lower stratosphere over India: First results(2016), Journal of Atmospheric and Solar-Terrestrial Physics, 140,86-93, http://dx.doi.org/10.1016/j.jastp.2016.02.014.
  10. Uma, K. N., and S. S. Das, "Quantitative and Qualitative Assessment of Diurnal Variability in the Tropospheric Humidity using SAPHIR on-board Megha-Tropiques", Journal of Atmospheric Solar-Terrestrial Physics, 146, 89-100, (2016) doi: 10.1016/j.jastp.2016.05.009.
  11. Venkat Ratnam, M., S.R.Babu, S. S. Das, G. Basha, B.V.Krishnamurthy, and B. Venkateswararao (2016): Effect of tropical cyclones on the Stratosphere-Troposphere Exchange observed using satellite observations over north Indian Ocean, Atmos. Chem. Phys., http://dx.doi.org/10.5194/acp-2015-988.

2015

 

  1. Das, S.S., M. V. Ratnam, K. N. Uma, K. V. Subrahmanyam, I.A.Girach, A. K. Patra,S. Aneesh, K.V. Suneeth, K. K. Kumar, A.P.Kesarkar, S. Sijikumar and G. Ramkumar (2015),Geetha Ramkumar, Influence of Tropical Cyclones on Tropospheric Ozone: Possible Implication, Atmospheric Chemistry and Physics-Discussion, 15, 19305-19323,http://dx.doi.org/10.5194/acpd-15-19305-2015.
  2. Das, S.S., K. N. Uma, V.N.Bineesha, K.V.Suneeth, and G. Ramkumar (2015), Four decadal climatological intercomparison of Rocketsonde and Radiosonde with different reanalysis data : Results from Thumba Equatorial Station, Quarterly Journal of Royal Meteorological Society, http://dx.doi.org/10.1002/qj.2632.
  3. Das, S.K., S. M. Deshpande, S.S.Das, M. Konwar, K.Chakravarty and M. C.R.Kalapureddy (2015), Temporal and structural evolution of a tropical monsoon cloud system: A case study using X-band radar observations, Journal of Atmosphere and Solar-Terrestrial Physics, doi : 10.1016/j.jastp.2015.08.009.
  4. Kishore Kumar, G., K. Kishore Kumar, G. Baumgarten, and Geetha Ramkumar, "Validation of MERRA reanalysis upper-level winds over low latitudes with independent rocket sounding data", Journal of Atmospheric and Solar-Terrestrial Physics, 123, 48-54, 2015, doi:10.1016/j.jastp.2014.12.001.
  5. Kumar, AH, MV Ratnam, S.V. Sunilkumar, K. Parameswaran, B.V.K. Murthy,"Role of deep convection on the tropical tropopause characteristics at sub-daily scales over the South India monsoon region", Atmospheric Research 161, 14-24 Volumes 161–162,14–24, 2015.
  6. Subrahmanyam, K.V., K. K. Kumar and N. B. Alur,"Phase relation between CAPE and precipitation at diurnal scales over the Indian summer monsoon region" Atmospheric Science Letters, http://dx.doi.org/10.1002/asl2.566, 2015.
  7. Sunilkumar, S.V., M. Muhsin, K. Parameswaran, M. Venkat Ratnam, Geetha Ramkumar, K. Rajeev, B.V. Krishna Murthy, K.V. Sambhu Namboodiri, K.V. Subrahmanyam, K. Kishore Kumar, Siddarth Shankar Das (2015), Characteristics of turbulence in the troposphere and lower stratosphere over the Indian Peninsula, Journal of Atmosphere and Solar-Terrestrial Physics,http://dx.doi.org/10.1016/j.jastp.2015.07.015.
  8. SarkhelS, John D. Mathews, Shikha Raizada, R Sekar, D. Chakrabarty, A. Guharay, Robert B. Kerr, Geetha Ramkumar, S. Sridharan, Qian. Wu, and Martin G. Mlynczak,"A case study on occurrence of an unusual structure in the sodium layer over India", Earth Planet & Space,2015, http://dx.doi.org/10.1186/s40623-015-0183-5.
  9. Singh, C., L. Thomas, K. K. Kumar (2015),Impact of aerosols and cloud parameters on Indian summer monsoon rain at intraseasonal scale: a diagnostic study, Theoretical and Applied Climatology, http://dx.doi.org/10.1007/s00704-015-1640-6.

2014

 

  1. Babu, S.B, and G. Ramkumar, “Planetary waves – major forcing agent in generating stratospheric and mesospheric quasi biennial oscillation”, Current Science, 106(9), 2014.
  2. Ravindra Babu, S., Ratnam, M.V, S.V. Sunilkumar, K.Parameswaran, B.V.KrishnaMurthy, Detection of tropopause altitude using Indian MST radar data and comparison with simultaneous radiosonde observations. J. Atmos. Sol -Terr. Phys. 121,240–247, 2014.
  3. Das, S.S., K. K. Kumar, K. N. Uma, M. V. Ratnam, A. K. Patra, S. K. Das, A. K. Ghosh, and A. R. Jain, "Modulation of thermal structure in the upper troposphere and lower stratosphere (UTLS) region by inertia-gravity waves : A case study inferred from simultaneous MST radar and GPS sonde observations", Indian Journal Radio and Space Physics (NISCAIR-CSIR), 43, 2014, PACS No. 92.60.hd;92.60.hf,92.60.hh
  4. Kishore Kumar, G., K. Kishore Kumar, W. Singer, C. Zülicke, S. Gurubaran, G. Baumgarten, G. Ramkumar, S. Sathishkumar, and M. Rapp, "Mesosphere and lower thermosphere zonal wind variations over low latitudes: Relation to local stratospheric zonal winds and global circulation anomalies, Journal Geophysical Research Atmosphere", Journal of Geophysical Research.,2014, http://dx.doi.org/10.1002/2014JD021610.
  5. Manju G., Madhav Haridas M. K., G. Ramkumar, Tarun K. Pant, R. Sridharan and Sreelatha P, “Gravity wave signatures in the dip equatorial ionosphere -thermosphere system during the annular solar eclipse of 15 January 2010”, Journal of Geophysical Research-Space Physics, 2014, http://dx.doi.org/10.1002/2014JA019865.
  6. Uma, K.N., S. K. Das, and S. S. Das, “A climatological perspective of water vapor at the UTLS region over different global monsoon regions: observations inferred from the Aura-MLS and reanalysis data”, Climate Dynamics, 2014, http://dx.doi.org/10.1007/s00382-014-2085-9.
  7. Venkat Ratnam, M., S. V. Sunilkumar, K. Parameswaran, B. V. Krishna Murthy, Geetha Ramkumar, K. Rajeev, Ghouse Basha, S. Ravindra Babu, M. Muhsin, Manoj Kumar Mishra, A. Hemanth Kumar, S. T. Akhil Raj, and M. Pramitha, "Tropical tropopause dynamics (TTD) campaigns over Indian region: An overview", Journal of Atmospheric and Solar-Terrestrial Physics, 121, Part B, 229-239, doi:10.1016/j.jastp.2014.05.007, 2014.

2013

 

  1. Das, S. K., S. S. Das, C. W. Chiang, and J. B. Nee, “Descending cirrus associated with planetary scale disturbance: An observational study from lidar, radiosonde and reanalysis data”, Journal of Atmosphere Solar-Terrestrial Physics, 104, 137-147, 2013, http://dx.doi.org/10.1016/j.jastp.2013.08.019.
  2. Das, S. S., K. Kishore Kumar, and G. Ramkumar, “First observations of quasi 120 day oscillation in Mesospheric winds and temperature: Observations inferred from Meteor Radar”, Radio Science, 48, 2013, http://dx.doi.org/10.1002/rds.20037.
  3. John, S. R., and K. K. Kumar, “A discussion on the methods of extracting gravity wave perturbations from space-based measurements”, Geophysical Research Letters, 40, http://dx.doi.org/10.1002/grl.50451.
  4. Liu, G., T. J. Immel, S. L. England, H. U. Frey, S. B. Mende, K. K. Kumar, and G. Ramkumar, “Impacts of atmospheric ultrafast Kelvin waves on radio scintillations in the equatorial ionosphere”, Journal of Geophysical Research-Space Physics, 118, 885 - 891, 2013, http://dx.doi.org/10.1002/jgra.50139.
  5. Ramkumar, G., K. V. Subrahmanyam, K. Kishore Kumar, S.S.Das, Debadatta Swain, S. V. Sunilkumar, K. V. S. Namboodiri, K.N.Uma , Veena Suresh Babu,Sherine Rache John and Asha Babu, “First observational study during a solar eclipse event on variations in the horizontal winds simultaneously in the troposphere-stratosphere-mesosphere-lower thermosphere region over the equatorial station Thumba (8.5 N, 77 E)”, Earth, Planets and Space, 65, 781-790, 2013, http://dx.doi.org/10.5047/eps.2012.12.007.
  6. Sunilkumar, S. V., A. Babu, and K. Parameswaran, “Mean structure of the tropical tropopause and its variability over Indian longitude sector”, Climate Dynamics, 1125-1140, 2013, http://dx.doi.org/10.1007/s00382-012-1496-8,
  7. Subrahmanyam, K.V., and K. K. Kumar, “CloudSat observations of cloud-type distribution over the Indian summer monsoon region”, Annales Geophysicae, 31, http://dx.doi.org/10.5194/angeo-31-1-2013.
  8. Subrahmanyam, K.V. and K.Kumar, “Megha-Tropiques/SAPHIR measurements of humidity profiles: validation with AIRS and global radiosonde network”, Atmospheric Measurement Techniques-Discussion., 6, 1–32., 2013, http://dx.doi.org/10.5194/amtd-6-11405-201
  9. Subrahmanyam, K.V., K.K.Kumar and G. Ramkumar, “Delayed effects of annular solar eclipse of 15 January 2010 on the tropospheric and lower stratospheric winds along the eclipse path”, Atmospheric Research, 122, 1 - 7, 2013, http://dx.doi.org/10.1016/atmosres.2012.10.034
  10. Swain D, N. V. P. Kiran Kumar, K. K. Kumar, M.M. Hossain, M. Rajasekhar, G. Ramkumar, Application of Wavelet De-noising for Wind Speed Retrieval from a 2.5 MHz Partial Reflection Radar, Current Trends in Signal Processing, 3, 2, 2013, ISSN: 2277-6176.
  11. Uma, K N, K.K.Kumar, S. S. Das, “Migrating and non-migrating diurnal and semi-diurnal tides over a tropical and an equatorial station”, Indian Journal of Radio and Space Physics, 42 (5), 340-355, 2013
  12. Uma, K.N., S.K.Das, S.S.Das, and K.K. Kumar, “Aura-MLS Observations of Water Vapor Entering the Stratosphere over the Northern Bay of Bengal and East Equatorial Indian Ocean”, Terrestrial, Atmosphere and Ocean., 24, 3, 357-368, 2013, http://dx.doi.org/10.3319/TAO.2012.11.06.01(A).

2012

 

  1. Babu, V. S., G. Ramkumar, and S.R John, “Seasonal variation of planetary wave momentum flux and its forcing towards the mean flow acceleration in the MLT region”, Journal of Atmosphere Solar-Terrestrial Physics, 78-79, 53-61, 2012, http://dx.doi.org/10.1016/j.jastp.2011.05.010.
  2. Das, S. S., K. K. Kumar, S. K. Das, C. Vineeth, T. K. Pant, and G.Ramkumar, “Variability of mesopause temperature derived from two independent methods using meteor radar and its comparison with SABER and EOS-MLS and a co-located multi-wavelength day-glow photometer over an equatorial station Thumba (8.5N, 76.5E)”, International Journal of Remote Sensing, 33,14, 4634-4647, 2012, http://dx.doi.org/10.1080/0141161.2011.643461.
  3. Das, S. K., S. S. Das, C.W. Chiang, K. K. Kumar, J. B. Nee, “Variability in tropopause height and its temperature on different time scales: An observational study over Banqiao, Taiwan” , Journal of Atmosphere Solar-Terrestrial Physics,81-82, 1-8, 2012, http://dx.doi.org/10.1016/j.jastp.2012.03.013
  4. Das, S. S., K. N. Uma, and S. K. Das , “MST radar observations of short-period gravity wave during overhead tropical cyclone”, Radio Science, 47, 2, 2012, http://dx.doi.org/10.1029/2011RS004840.
  5. England, S. L., G. Liu, Q. Zhou, T. J. Immel, K. K. Kumar, and G. Ramkumar , “On the signature of the quasi-three-day wave in the thermosphere during the January 2010 URSI World Day Campaign”, Journal of Geophysical Research, 117, A06304, 2012, http://dx.doi.org/10.1029/2012JA017558.
  6. John, S.R and K.K. Kumar , “TIMED/SABER Observations of Global Gravity Wave climatology and their interannual variability from stratosphere to mesosphere lower thermosphere”, Climate Dynamics, 39, 1489 - 1505, 2012,http://dx.doi.org/10.1007/s00382-012-1329-9.
  7. John, S.R and K.K. Kumar , “The concept of wave -turbopause layer and its signature in the global mesosphere-Lower Thermospheric gravity wave activity”, Journal of Geophysical Research, 117, A10310,2012, http://dx.doi.org/10.1029/2012JA018172.
  8. Kumar, K.K., and K.V.Subrahmanyam , “A discussion on the assumption of ambipolar diffusion of meteor trails in the upper atmosphere”, Monthly Notices of the Royal Astronomical Society., 425(1), L1-L5. 2012, http://dx.doi.org/10.1111/j.1745-3933.2012.01279.x
  9. Liu, G., S. L. England, T. J. Immel, K. K. Kumar, G. Ramkumar, and L. P. Goncharenko , “Signatures of the 3-day wave in the low- and mid-latitude ionosphere during the January 2010 URSI World Day campaign”, Journal of Geophysical Research, 117, A06305, 2012, http://dx.doi.org/10.1029/2012JA017588.
  10. Namboodiri, K.V.S., P.K.Dileep, K. Mammen, G. Ramkumar, N.V.P.Kirankumar, S. Sreenivasan, B. Suneel Kumar, and R. K. Manchanda , “Effect of annular solar eclipse of 15 January 2010 on meteorological parameters in the 0 to 65 km region over Thumba”, India, Meteo Zeits., 20, 635-647,2012, http://dx.doi.org/10.1127/0942-2948/2011/0253.
  11. Rao, P. B, G. Beig, R. S. Dabas, G. Ramkumar, S. Gurubaran, K. G Rao, P. K. Manoharan, A. K. Patra, S. Ravindran, T. K. Pant, M. V. Ratnam, S. C. Chakravarty, R. Sridharan , “An Overview of CAWSES - India Program with emphasis on Equatorial Atmospheric Coupling”, Journal of Atmosphere Solar-Terrestrial Physics, 75-76, 2012, http://dx.doi.org/10.16/j/jastp.2011.08.005.
  12. Sumod, S.G., T. K. Pant, M. Lijo, M. Hossain, and K. K. Kumar, “Signatures of Sudden Stratospheric Warming on the Equatorial Ionosphere-Thermosphere System”, Planet, Space Science, 63-64, 49-55. 2012.
  13. Uma, K. N., K. K. Kumar, S. S. Das, T. N. Rao, and T. M. Satyanarayana , “On the vertical distribution of mean vertical velocities in the convective regions during wet and dry spells of Indian summer monsoon over Gadanki”, Monthly Weather Review, 140, 398-410, 2012, http://dx.doi.org/10.1175/MWR-D-11-00044.1.
  14. Vineeth, C., T. K. Pant, K. K. Kumar, Lijo Jose, S. G. Sumod, S. Alex,” Counter equatorial electrojet: Analysis of the variability in daytime mesopause temperature and winds”, Journal of Atmosphere Solar-Terrestrial Physics, http://dx.doi.org/10.1016/j.jastp.2011.07.005.

Book Publications

 

  1. Das, S. S , “Characteristics of the quasi 16 day wave in the mesosphere and lower thermosphere (MLT) region: A review over an equatorial station Thumba (8.5oN, 76.5oE)”, Chapter in Book entitled, Modern Climatology, InTech-Ope. Acc. Pub., 2012, ISBN 979-953-307-337-7, http://dx.doi.org/10.5772/33641.
  2. Sunilkumar, S.V., Parameswran. K., Thampi, B.V., Distribution of particulates in the tropical UTLS over the Asian Summer Monsoon region and its association with Atmospheric dynamics, Chapter in Book titled "Atmospheric Aerosols: Regional Characteristics - Chemistry and Physics" (ISBN 979-953-307-897-6) Edited by Hayder Abdul-Razzak; Published by Intech, 114-162, 2012, http://dx.doi.org/10.5772/50552

2011

 

  1. Babu, V. S., K. K. Kumar, S. R. John, and G.Ramkumar, “Meteor radar observations of short-term variability of quasi 2-day waves and their interaction with tides/planetary waves in the Mesosphere-Lower Thermosphere region over Thumba (8.50N, 770 E)”, Journal of Geophysical Research, 116, 2011, http://dx.doi.org/10.1029/2010JD015390.
  2. Bijoy, V. T., K. Parameswaran, and S. V. Sunilkumar, “Semitransparent cirrus clouds in the upper tropopshere and their contribution to the particulate scattering in the Tropical UTLS region”, Journal of Atmosphere Solar-Terrestrial Physics, 2011, http://dx.doi.org/10.1016/j/jastp.2011.09.005.
  3. Das, S. S., S. Sijikumar, and K. N. Uma, “Further investigation on stratospheric air intrusion into the troposphere during the episode of tropical cyclone: Numerical simulation and MST radar observations”, Atmospheric Research, 101, 928-937, 2011, http://dx.doi.org/10.1016/j.atmosres.2011.05.023 .
  4. John, S.R and K.K.Kumar, “TIMED/SABER Observations of Global Cold-Point Mesopause Variability at Diurnal and Planetary Wave Scales”, Journal of Geophysical Research,116, A06314, 2011, http://dx.doi.org/10.1029/2010JA015945.
  5. John, S.R., K.K. Kumar, K. V. Subrahmanyam, G. Manju, and Q. Wu, “Meteor radar measurements of MLT winds near the equatorial electro jet region over Thumba (8.50N, 770E): comparison with TIDI observations”, Annales Geophysicae., 29, 1214, 2011,
  6. Kumar, K.K, K. V. Subrahmanyam and S. R. John, “New insights on the response of stratospheric and mesosphere-lower thermospheric ozone to abrupt changes in solar forcing”, Annales Geophysicae., 29, 1093-1099, 2011, http://dx.doi.org/10.5194/angeo-29-1093-2011.
  7. Kumar, K.K, D. Swain, S. R. John, and G. Ramkumar, “Simultaneous observations of SAO and QBO in winds, temperature and ozone in the tropical middle atmosphere over Thumba (8.50N, 770E)”, Climate Dynamics, 2011, http://dx.doi.org/10.1007/s00382-010-0991-z.
  8. Ramkumar, G., V.S. Babu and K.V.Subrahmanyam, Characteristics of winds in the equatorial MLT region-A Review, Asia. J. Phys.,19, No.4, 457-474, 2011;
  9. Sunilkumar, S. V., K. Parameswaran, B. V. Thampi, and G. Ramkumar, “Variability in background stratospheric aerosols over the tropics and its association with atmospheric dynamics”, Journal of Geophysical Research, 116, 2011, http://dx.doi.org/10.1029/2010JD015213.
  10. Subrahmanyam, K. V., G. Ramkumar, K. K. Kumar, D. Swain, S. Sunilkumar, S. S. Das, R. K. Choudhary, K. V. S. Namboodiri, K. N. Uma, S. B. Veena,S. R. John, and A. Babu, “Temperature perturbation in the troposphere-stratosphere over Trivandrum during Solar eclipse 2009/2010”, Annales Geophysicae., 29, 275-282, 2011, http://dx.doi.org/ 10.5194/angeo-29-275-2011.
  11. Uma, K. N., K.K. Kumar, and T. N. Rao, “VHF radar observed characteristics of convectively generated gravity waves during wet and dry spells of Indian monsoon”. Journal of Atmosphere Solar-Terrestrial Physics, 73, 815-824, 2011, http://dx.doi.org/10.1016/j.jastp.2010.07.016.
  12. Vineeth, C.,T. K. Pant,S.G.Sumod,K.K.Kumar,S.Gurubaran,R.Sridharan, “Planetary wave-tidal interactions over the equatorial mesosphere-lower thermosphere region and their possible implications for the equatorial electrojet” ,Journal Geophysical Research, 116, 2011, http://dx.doi.org/10.1029/2010JA015895.

Book Publication

 

  1. Ramkumar G., ‘Dynamical Coupling Between Different Regions of Equatorial Atmosphere’, chapter 3, in the book “Aeronomy of the Earth’s Atmosphere and Ionosphere”, Springer publications, ISBN 978-94-007-0325-4, ed. M A Abdu et al., March 2011

2010

 

  1. Abhilash, S., K. Mohankumar, S. S. Das, and K. K. Kumar , “Vertical structure of tropical mesoscale convective systems : observations using VHF radar and cloud resolving model simulations”, Meteorology and Atmospheric Physics., 109, 73 - 90, 2010, doi :10.1007/s00703-010-0087-7.
  2. Chandra, N R., G. Yellaiah, S. V. B. Rao, and G. RamKumar , “MST radar observations of meteor showers and trail induced irregularities in the Ionospheric E-region”, Indian Journal of Radio and Space Physics., 39,138-143. 2010,
  3. Das, S. S., A.K.Ghosh, K. Satheesan, A.R. Jain, and K. N. Uma , “Characteristics of atmospheric turbulence in terms of background atmospheric parameters inferred using MST radar at Gadanki (13.5 N, 79.2E)”, Radio Science, 45, RS4008, 2010, http://dx.doi.org/10.1029/2009RS004256.
  4. Das, S. S., K. K. Kumar, S. B. Veena, and G. Ramkumar , “Simultaneous observation of quasi 16-day wave in the mesospheric winds and temperature over low-latitudes with the SKiYMET radar”, Radio Science,45, RS6014, 2010, http://dx.doi.org/10.1029/2009RS004300.
  5. Das, S. S., K. K. Kumar, and K. N. Uma , “MST radar investigation on inertia-gravity waves associated with tropical depression in the upper troposphere and lower stratosphere over Gadanki (13.5N, 79.2E)”, Journal of Atmosphere Solar-Terrestrial Physics, 72, 1184-1194, 2010, http://dx.doi.org/10.1016/j.jastp.2010.07.016.
  6. Rao, T. N., K. N. Uma, T. M. Satyanarayana, and D. N. Rao , “Differences in draft core statistics from wet spell to dry spell over Gadanki (13.5 N, 79.2 E). India”, Monthly Weather Review., 2010, http://dx.doi.org/ 10.1175/2009MWR3057.1.
  7. Jain, A. R., V. Panwar, T. K. Mandal, V. R. Rao, A. Goel, R. Gautam, S. S. Das, and S. K. Dhaka , “Influence of monsoon associated mesoscale convection systems on the tropical tropopause region”, Annales Geophysicae., 28, 927-940, 2010,
  8. Jena, B., D. Swain and A. Tyagi , “Application of artificial neural networks for sea surface wind speed retrieval from IRS-P4 (MSMR) brightness temperature”, IEEE-Geo and Remote Sensing Letters, 7 (3), 567-571, 2010,
  9. Liu, G., T. J. Immel, S. L. England, K. K. Kumar, and G. Ramkumar , “Temporal modulation of the four-peaked longitudinal structure of the equatorial ionosphere by the 2 day planetary wave”, Journal of Geophysical Research, 115, A12338, 2010, http://dx.doi.org/ 10.1029/2010JA016071.
  10. Liu, G., Immel T.J., S.L.England, K.K.Kumar, and G. Ramkumar , “Temporal modulations of the longitudinal structure in F2 peak height in the equatorial ionosphere as observed by COSMIC”, Journal of Geophysical Research, 115, A04303, 2010, http://dx.doi.org/10.1029/2009JA014829.
  11. Narendra Babu, A., J. B. Nee, and K. K. Kumar , “Seasonal and diurnal variation of convective available potentialenergy (CAPE) using COSMIC/FORMOSAT-3 observations over the tropics”, Journal of Geophysical Research, 115, D04102, 2010, http://dx.doi.org/10.1029/2009JD012535.
  12. Parameswaran, K., Bijoy V Thampi, S. V. Sunilkumar , “Latitudinal dependence of the seasonal variation of particulate extinction in the UTLS over the Indian longitude sector during volcanically quiescent period based on lidar and SAGE-II observations”, Journal of Atmosphere Solar-Terrestrial Physics, 72, 1024-1035, 2010, http://dx.doi.org/10.1016/j.jastp.2010.06.004.
  13. Sunilkumar, S. V., K. Parameswaran, K. Rajeev, B. V. Krishna Murthy, Sanjay Mehta, and Asha Babu , “Semitransparent Cirrus clouds in the Tropical Tropopause Layer during two contrasting seasons”, Journal of Atmosphere Solar-Terrestrial Physics, http://dx.doi.org/10.1016/j.jastp.2010.03.020, 72, 745-76, 2010,
  14. UdayBhaskar, T. V. S., D. Swain, M. Ravichandran , “Sonic Layer Depth variability in the Arabian Sea”, Int. J. Oce. Oceano.,4, 17-28, 2010,

Book Publication

 

  1. Sreevalsan, E., S. S.Das, R. Sasikumar, T. Arivukkodi, and J. Badger , “Indian Wind Atlas”, Govt. of India, Ministry of New and Renewable Energy, Centre for Wind Energy Technology, 2010, ISBN : 978-81-909823-0-6.

2009

 

  1. Das, S. S. , “A new perspective on MST radar observations of stratospheric intrusions into-troposphere associated with tropical cyclone”, Geophysical Research Letters, 36, L15821, 2009, http://dx.doi.org/10.1029/2009GL039184.
  2. Dolas, P.M. and K. K. Kumar , “Retrieval of static stability parameter from the radiosonde/rawinsonde ascent rare profiles : A wavelet approach”, Annales Geophysicae., 27, 1-7, 2009,
  3. Kumar, K. K., G. Ramkumar, and S. T. Shelbi , “Reply to comment by R. Dhanya and S. Gurubaran on Initial results from SKiYMET meteor radar at Thumba (8.5°N, 77.2°E): 1. Comparison of wind measurements with MF spaced antenna radar system”, Radio Science, 44, RS5005, 2009, http://dx.doi.org/10.1029/2008RS004123.
  4. Kumar, K. K., and K. N. Uma , “High temporal resolution VHF radar observations of stratospheric air intrusion into the upper troposphere during the passage of a mesoscale convective system over Gadanki”, Atmospheric Chemistry and Physics- Discussion, 2009, 9, 1-15.
  5. Rao, T. N., K. N. Uma, T. M. Satyanarayana , and D. N. Rao, “Differences in draft core statistics from wet spell to dry spell over Gadanki (13.5 N, 79.2 E). India”, Monthly Weather Review, 2009, http://dx.doi.org/10.1175/2009MWR3057.1.
  6. Swain, D., H. Rahman and M. Ravichandran , “Comparison of NCEP turbulent heat fluxes with in situ observations over the south-eastern Arabian Sea”, Meteorology and Atmospheric Physics, 104 (3), 2009, http://dx.doi.org/10.1007/s00703-009-0023-x, 163-175.
  7. Sridharan, S., P. V. Prasanth, Y. B. Kumar, G. Ramkumar, S. Satishkumar, K. raghunath , “Observations of peculiar sporadic sodium structures and their relations with wind variations”, Journal of Atmosphere Solar-Terrestrial Physics, 71, 575-582, 2009
  8. Uma, K.N., and T. N. Rao , “Diurnal Variation in Vertical Air Motion over a Tropical Station, Gadanki (13. °N,79.2°E), and its Effect on the Estimation of Mean Vertical Air Motion”, Journal of Geophysical Research, D20106, 2009, http://dx.doi.org/10.1029/2009JD012560.

2008

 

  1. Antonita, T.M., G. Ramkumar, K.K. Kumar and S.V. Sunil Kumar , “Quantification of gravity wave forcing in driving the stratospheric Quasi-Biennial Oscillation”, Geophysical Research Letters, L09805, 2008, http://dx.doi.org/ 10.1029/2008GL033960.
  2. Antonita, T.M., G. Ramkumar, K.K. Kumar and V. Deepa , “Meteor wind radar observations of gravity wave momentum fluxes and their forcing towards the Mesospheric Semiannual Oscillation”, Journal of Geophysical Research, 113, D10115, 2008, http://dx.doi.org/ 10.1029/2007JD009089.
  3. Babu, A.N.., K.K Kumar, G. K. Kumar, M. V. Ratnam, S.V.B Rao and D. N. Rao , “Long-term MST radar observations of vertical wave number spectra of gravity waves in the tropical troposphere over Gadanki (13.50N, 79.20E): comparison with model spectra”, Annales Geophysicae., 26, 1671-1680, 2008
  4. Das, S.S., A. R. Jain, K.K. Kumar, D.N. Rao, “Diurnal variability of the tropical tropopause : significance of VHF Radar measurements” , Radio Science, 43, RS6003, 2008, http://dx.doi.org/ 10.1029/2008RS003824, 2008.
  5. Das,S.S., A. K.Patra, D. Narayana Rao , “VHF Radar echoes in the vicinity of Tropopause during the passage of Tropical Cyclone: First observations from the Gadanki MST radar”, Journal of Geophysical Reseatch,113, D09113, 2008, http://dx.doi.org/10.1029/2007JD009014.
  6. Deepa, V. G. Ramkumar, T.M. Antonita, K.K. Kumar, “Meteor wind Radar Observations of tidal amplitudes over a low latitude station Trivandrum (8..5 °N, 77°E): Interannual variability and the effect of background wind on diurnal tidal amplitudes”, Journal of Atmosphere Solar-Terrestrial Physics, 2008,http://dx.doi.org/ 10.1016/j.jastp.2008.07.017.
  7. Gurubaran, S., D. Narayana Rao, G. Ramkumar, T.K. Ramkumar, Gopa Dutta and B.V. Krishna Murthy , “First results from the CAWSES-INDIA tidal campaign”, Annales Geophysicae. 26, 2323-2331, 2008
  8. Kumar, K.K., C. Vineeth, T.M. Antonita, T.K. Pant and R. Sridharan , “Determination of day-time OH emission heights using simultaneous meteor radar, day-glow photometer and TIMED/SABER observation over Thumba (8.5°N, 77°E)”, Geophysical Research Letters, 35, L18809, http://dx.doi.org/10.1029/2008GL035376.
  9. Kumar, K.K., V. Deepa, T.M. Antonita and G. Ramkumar , “Meteor radar observations of short-term tidal variabilities in the low-latitude Mesosphere-Lower Thermosphere: Evidence for non-linear wave-wave interactions”, Journal of Geophysical Research, 113, D16108, 2008, http://dx.doi.org/ 10.1029/2007JD009610.
  10. Kumar, G.K., M.V. Ratnam, A.K. Patra, V.V.M. Jagannadha Rao, S.V.B. Rao, K.K. Kumar, S. Gurubaran, G. Ramkumar and D.N. Rao , “Low-Latitude Mesospheric Mean Winds Observed by Gadanki MST Radar and comparison with Rocket, HRDI, MF Radar measurements and HWM93”, Journal of Geophysical Research, 113, D19117, 2008, http://dx.doi.org/ 10.1029/2008JD009862.
  11. Ratnam, M.V., G.K. Kumar, B.V.K. Murthy, A.K. Patra, V.V.M. J Rao, S.V.B. Rao, K.K. Kumar, G. Ramkumar , “Long-term variability of the low latitude mesospheric SAO and QBO and their relation with stratospheric QBO”, Geophysical Research Letters, 35, L21809,2008, http://dx.doi.org/ 10.1029/2008GL035390.
  12. Rajeev, K., K. Parameswaran, S. Meenu, S. V. Sunilkumar, Bijoy V Thampi, C. Suresh Raju, B. V. Krishna Murthy, K. S. Jagannath, S. K. Mehta, D. N. Rao, and K. G. Rao, Observational assessment of the potential of satellite-based water vapour and thermal IR brightness temperatures in detecting semitransparent cirrus, Geophysical Research Letters., 35, L08808, 2008, http://dx.doi.org/ 10.1029/2008GL033393.
  13. Swain, D. , “Winds from Fire”, Vatavaran, 32 (1), 1-3, 2008
  14. Swain, D., M.M. Ali and P.N. Sen , “Sensitivity of a one-dimensional ocean mixed layer model to surface meteorological parameters”, Vatavaran, 32 (2), 27-34, 2008
  15. Udaya Bhaskar, T.V.S., D. Swain and M. Ravichandran , “Seasonal Variability of Sonic Layer Depth in the Central Arabian Sea”, Oce. Sci. J., 43(3), 147-152, 2008

2007

 

  1. Antonita, T.M., Geetha Ramkumar, K. K. Kumar and V. Deepa, Meteor wind radar observations of gravity wave momentum fluxes and their forcing towards the Mesospheric Semiannual Oscillation, Journal of Geophysical Research, 113, D10115, 2007, http://dx.doi: 10.1029/2007JD009089
  2. Antonita, T. M., G. Ramkumar, K.K. Kumar, K.S. Appu, K.V.S Namboodiri, “A quantitative study on the role of gravity waves in driving the tropical Stratospheric Semiannual Oscillation”, Journal of Geophysical Research, 112, 2007, http://dx.doi.org/ 10.1029/2006JD008250.
  3. Deepa, Geetha Ramkumar and K.K. Kumar (2007), Observational evidence for the generation of 4-day oscillation in the low-latitude middle atmosphere associated with an anomalous stratospheric cooling, Annales Geophysicae,25,1959-1965
  4. Kalapureddy, M.C.R., K.K. Kumar, V. Siva Kumar, A.K. Ghosh, A.R. Jain and K Krishna Reddy, “Diurnal and seasonal variability of TKE dissipation rate in the ABL over a tropical station using UHF wind profiler”, Journal of Atmosphere Solar-Terrestrial Physics, 2007, http://dx.doi.org/ 10.1016/j.jastp.2006.10.016.
  5. Kumar, K.K, “Temperature profiles in the MLT region using radar-meteor trail decay times: Comparison with TIMED/SABER observations”, Geophysical Research Letters, 34, L16811,2007, http://dx.doi.org/ 10.1029/2007GL030704, 2007.
  6. Kumar K.K, “VHF radar investigation on the role of mechanical oscillator effect in exciting convectively generated gravity waves”, Geophysical Research Letters, 34, L01803, 2007, http://dx.doi.org/ 10.1029/2006 GL027404.
  7. Kumar K.K, Maria Antonita, G. Ramkumar, Deepa, Gurubaran and Rajaram, “On the Tropospheric origin of MLT region Intraseasonal Wind variability”, Journal of Geophysical Research, 112, D07109, 2007, http://dx.doi.org/ 10.1029/2006JD007962.
  8. Kumar, K.K., G. Ramkumar, T Shelbi, “Initial results from SKiYMET meteor radar at Thumba (8.5 °N, 77°E): Comparison of wind measurements with MF spaced antenna radar system”, Radio Science, 42, RS6008, 2007, http://dx.doi.org/10.1029/2006RS003551.
  9. Kumar, K. K., Maria Antonita, T. Shelbi, Initial results from SKiYMET meteor radar at Thumba (8.5°N, 77°E): 2.Gravity wave observations in the MLT region, Radio Sci., 42, RS6009, 2007, http://dx.doi. 10.1029/2006RS003553.
  10. Moorthy, K. K., S. S. Babu, K.V.S. Badarinath, S. V. Sunilkumar, T.R. Kiranchand, Y. Nazeer Ahmed, Latitudinal distributions of aerosol black carbon and its mass fraction to composite aerosols over peninsular India during winter season, Geophysical Research Letters, 34, L08802, 2007, http://dx.doi.org/ 10.1029/2006GL029150.
  11. Pancheva, D.V., P. J. Mukhtarov, N.J. Mitchell, D.C. Fritts, D. M. Riggin, H. Takahashi, P.P. Batista, B. R. Clemesha, S. Gurubaran and G Ramkumar, “Planetary Wave Coupling (5-6 Day Waves) in the Low Latitude Atmosphere-Ionosphere System”, Journal of Atmosphere and Solar-Terrestrial Physics, 2007, http://dx.doi.org/10.1016/j.JASTP.2007.10.003.2007.
  12. Udaya Bhaskar, T.V.S, D. Swain and M. Ravichandran, “Mixed Layer Variability in Northern Arabian Sea as detected by an Argo float”, Ocean Science Journal, 42 (4), 241-246, 2007,http://dx.doi.org/10.1007/BF03020915.

2006

 

  1. Deepa, V., G. Ramkumar, and B. V. Krishna Murthy, Gravity waves observed from the Equatorial Wave Studies (EWS) campaign during 1999 and 2000 and their role in the generation of stratospheric semiannual oscillations, Annales Geophysicae, 24, 2481-2491, 2006,http://dx.doi.org/10.5194/angeo-24-2481-2006.
  2. Deepa, V., Geetha Ramkumar, Maria Antonita, Karanam Kishore Kumar and M N Sasi, Vertical Propagation Characteristics and Seasonal Variability of Tidal Wind Oscillations in the MLT region over Trivandrum (8oN, 77oE): First Results from SKiYMET Meteor Radar, Annales Geophysicae, 24, 2877–2889, 2006,http://dx.doi.org/10.5194/angeo-24-2877-2006.
  3. Kumar, K. K., VHF radar observations of convectively generated gravity waves: some new insights, Geophysical Research Letters, 33, 2006, L01815, http://dx.doi.org/10.1029/2005GL024109.
  4. Kumar, K.K., and A. R. Jain, L-band wind profiler observations of convective boundary layer over Gadanki (13.50 N, 79.20 E), India, Radio Science, 41, 2006, RS2004, http://dx.doi.org/10.1029/2005RS003259.
  5. Mrudula, G., K. Mohan Kumar and K.K. Kumar (2006), Tropospheric circulation changes during the passage of Tropical cyclone over Gadanki, Journal of Atmosphere and Solar-Terrestrial Physics, 68, 869–876, 2006,http://dx.doi.org/ 10.1016/j.jastp.2005.12.006.
  6. Nair, P R., George, S K., Sunilkumar, S V., Parameswaran, K., Jacob, S., Abraham, A., Chemical composition of aerosols over peninsular India during winter, Atmospheric Environment, 40, 6477-6493, 2006, http://dx.doi.org/10.1016/j.atmosenv.2006.02.031.
  7. Ramkumar, G., T. M. Antonita,Y. Bhavani Kumar, H. Venkata Kumar,and D. Narayana Rao, Seasonal variation of gravity waves in the Equatorial Middle Atmosphere: results from ISRO’s Middle Atmospheric Dynamics (MIDAS)program, Annales Geophysicae, 24, 2471-2480, 2006, http://dx.doi.org/10.5194/angeo-24-2471-2006

2005

 

  1. Kumar, K. K., J. Joseph, A. R. Jain, and D. N. Rao, VHF radar observations of weak echo regions in tropical mesoscale convective systems, Geophysical Research Letters, 32, L10804, 2005, http://dx.doi.org/10.1029/2004GL022238.
  2. Kumar, K. K., A. R. Jain, and D. N. Rao, VHF/UHF radar observations of tropical mesoscale convective systems over southern India, Annales Geophysicae, 23, 1673–1683, 2005,http://dx.doi.org/10.5194/angeo-23-1673-2005.
  3. Sasi, M. N., G. Ramkumar and B. V. Krishnamurthy, Studies on equatorial waves over the Indian zone, Current Science, 89, No.3, 475- 487, 2005.
  4. Vineeth, C., T. K. Pant, M. Antonita, G. Ramkumar, C. V. Devasia and R. Sridharan, A comparative study of daytime mesopause temperatures obtained using unique ground based optical and meteor wind radar techniques over the magnetic equator, Geophysical Research Letters, 32, L19101, 2005, http://dx.doi.org/10.1029/2005GL023728.

1988-2004

 

  1. Rajeev, K., K. Parameswaran, M. N. Sasi, G. Ramkumar, and BV Krishna Murthy, Rayleigh lidar observations of quasi-periodic waves in the tropical middle atmosphere, Journal of Geophysical Research, 108, D24, 4749, 2003, http://dx.doi.org/10.1029/2003JD 003682
  2. Rajeev,K., K. Parameswaran, Sasi M. N., G.Ramkumar and B.V. Krishna Murthy, Gravity waves in the tropical middle atmosphere: characteristics and wave-mean flow interaction, Advances in Space Research, Vol.32(5), pp. 807-812, 2003, http://dx.doi.org/10.1016/S0273-1177(03)00403-4 .
  3. Sasi, M. N., B.V. Krishna Murthy, G.Ramkumar, K. Satheesan, K.Parameswaran, K. Rajeev, S. V. Sunilkumar, Prabha R. Nair, K. Krishna Moorthy, Y. Bhavanikumar, K. Raghunath , A. R. Jain, P. B. Rao, M. Krishnaiah, S.R. Prabhakaran Nayar, K. Revathy, S. Devanarayanan, A study of equatorial wave characteristics using rockets, balloons, lidar and radar, Advances in Space Research Vol.32(5), pp. 813-818, 2003, http://dx.doi.org/10.1016/S0273-1177(03)00412-5.
  4. Krishnamurthy, B.V., K. Satheesan, K. Parameswaran, M.N. Sasi, G.Ramkumar, Y. Bhavanikumar and M. Krishnaiah, A Study of equatorial waves in temperature from 4 to 70 km using MST radar and Lidar observations at Gadanki (13.5oN, 79.2oE), Quarterly Journal of Royal Meteorological Society, 128, 819, 2002,http://dx.doi.org/10.1256/0035900021643700
  5. Parameswaran, K. K. Rajeev, M.N. Sasi, G.Ramkumar, and B.V. Krishna Murthy, First observational evidence of the modulation of gravity wave activity in the low latitude middle atmosphere by equatorial waves, Geophysical Research Letters., 29, 2002,http://dx.doi.org/10.1029/2001GL013625
  6. Sasi, M. N., G.Ramkumar and V. Deepa, Tidal wind oscillations in the tropical lower atmosphere as observed by Indian MST radar, Annales Geophysicae, 19, 991, 2001,http://dx.doi.org/10.5194/angeo-19-991-2001
  7. Parameswaran, K., M.N. Sasi, G.Ramkumar, Prabha R. Nair, V. Deepa, B.V. Krishna Murthy, S.R. Prabhakaran Nayar, K. Revathy, G. Mrudula, K. Satheesan, Y. Bhavanikumar, V. Sivakumar, K. Raghunath, T. Rajendraprasad and M. Krishnaiah, Altitude Profiles of Temperature from 4 to 80 km over the tropics from MST Radar and Lidar, Journal of Atmosphere and Solar-Terrestrial Physics., 62, 1327-1337, 2000,http://dx.doi.org/10.1016/S1364-6826(00)00124-3.
  8. Krishnamurthy, B.V., S.R. Prabhakaran Nayar, K. Revathy, G. Mridula, K. Satheesan, K. Parameswaran, M.N. Sasi, Prabha R. Nair, G.Ramkumar, V. Deepa, Y. Bhavanikumar, V. Sivakumar, K. Reghunath, T. Rajendra Prasad, & M. Krishnaiah, Preliminary results of equatorial wave experiment conducted from January 18 to March 5, 1999 with Lidar at Gadanki, Ind. J. Radio and Space Phys., 29, 231-234, 2000.
  9. Sasi, M.N., G.Ramkumar, V. Deepa and B.V. Krishna Murthy, Inertia gravity waves associated with the tropical easterly jet over the Indian subcontinent during the south west monsoon period, Geophysical Research Letters, 27, 3201-3204, 2000,http://dx.doi.org/10.1029/1999GL011216.
  10. Sasi, M.N., G.Ramkumar and V. Deepa, Non-migrating tidal oscillations in the horizontal winds over Gadanki (13oN, 79.2oE), Journal of Geophysical Research, 103, D16, 19485-19494, 1998, http://dx.doi.org/10.1029/98JD01729.
  11. Reddi, R. C., and G.Ramkumar, Climatologies of tidal winds in the meteor region over Trivandrum (8oN), Journal of Atmosphere and Solar-Terrestrial Physics, 59, 1757-1777, 1997, http://dx.doi.org/10.1016/S1364-6826(97)00042-4.
  12. Reddi, R. C., and G.Ramkumar, Climatologies of Quasi 2-day wind oscillations in the meteor region over Trivandrum, Indian J. Radio & Space Phys., 26, 1-14, 1997.
  13. Reddi, R. C., and G.Ramkumar, The annual and semi-annual wind fields in low latitudes, Journal of Atmosphere and Solar-Terrestrial Physics, 59, 487-495, 1997,http://dx.doi.org/10.1016/S1364-6826(96)00051-X.
  14. Reddi, R. C., and G.Ramkumar, Long period wind oscillations in the meteor region over Trivandrum (8oN),Journal of Atmosphere and Solar-Terrestrial Physics, 57, 1-12, 1995.
  15. Reddi, R. C., K Rajeev and G.Ramkumar, Diurnal variation in diffusion coefficient and occurrence rate of radiometeor trails, , Ind. J. Radio & Space Phys., 24, 55-63, 1995.
  16. Somayajulu, V.V., L. Cherian, K. Rajeev, G.Ramkumar & C. Raghava Reddi , Mean winds and tidal components during counter electrojet events, , Geophysical Research Letters. 20, 1443-1446, 1993,http://dx.doi.org/10.1029/93GL00088.
  17. Reddi, R. C., K. Rajeev and G.Ramkumar, Tidal winds in the radio meteor region over Trivandrum, Journal of Atmosphere and Solar-Terrestrial Physics, 55, 1219-1231, 1993.
  18. Reddi, R. C., K Rajeev and G.Ramkumar, Annual and semi-annual temperature oscillations at the mesopause level over Trivandrum, Journal of Geophysical Research, 98, 8925-8931, 1993,http://dx.doi.org/10.1029/92JD02819.
  19. Somayajulu, V.V., L. Cherian, G.Ramkumar and C. Raghava Reddi , Mean winds and tidal components measured with meteor trail radar during summer and winter months, Revista Brasilera de Geofisica, 11 (3), 1993.
  20. Reddi, R. C., K Rajeev and G. Ramkumar, Meteor wind radar system at Trivandrum (8.5oN,77oE), Indian J. Radio & space Phys., 21, 195-211, 1992.
  21. Reddi, R. C. K. Rajeev and G. Ramkumar, Winds in the meteor zone over Trivandrumdian, Ind.. J.Radio & space phys., 20, 82-91, 1991.
  22. Reddi, R. C. and A.G., A self calibrating facility for atmospheric radars,. Ind. J. Rad & space Phys., 18, 61-70, 1989.
  23. Reddi, R. C., A.G.and Lekshmi K.R, Quasi-two day wave in the middle atmosphere over Trivandrum, Annales Goephysicae., 6 (3), 231-238, 1988.