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Parameswaran, K., S. V.  Sunil Kumar and B. V. Krishna Murthy ,K. Satheesan, “Lidar observations of high altitude cirrus near the tropical tropopause”, in trace  constituents in the troposphere and lower stratosphere, Advances in Space Research, 34, 845-850, doi:10.1016/j.asr.2003.08.064, 2004.

Padma Kumari, B., A. L. Londhe, H. K. Trimbake and D. B. Jadhav, Comparison of aerosol vertical profiles derived by a passive and active remote sensing  techniques-a case study, Atmospheric Environment, 38, 6679-6685, 2004

Varadarajan, S., K. Jithendra Reddy and G. Ramachandra Reddy, Wind profile detection of atmospheric radar signal using wavelets and harmonic decomposition techniques, Atmospheric Science Letter, 5, 152-161, 2004

Chakravarty, S. C., Jayati Datta, S. Kamala, S. P. Gupta, High-resolution mesospheric layer structures from MST radar back scatter echoes over low latitude, J. Atmos. Solar Terr. Phys., 66,Issue 10, 859-866, 2004.

Choudhary, R. K., and J.-P. St.-Maurice., Observation of coherent echoes with narrow spectra near 150 km altitude during daytime away from the dip equator., Geophy. Res. Lett., 31., L19801, doi :10. 1029/2004GL020299, 2004

Sivakumar, V., B. Morel, H. Bencherif, J. L. Baray, S. Baldy, A. Hauchecorne and P. B. Rao, Rayleigh lidar observations of a warm stratopause over a tropical station, Gadanki (13.5oN; 79.2o)., Atmos. Chem. Phys., 4, 1989-1996, 2004

Pan, C. J., and P. B. Rao, Morphological study of the field-aligned E-layer irregularities observed by the Gadanki VHF radar, Ann. Geophys., 22, 3799-3804, 2004

Tiwari, D., A. K. Patra, C. V. Devasia, R. Sridhran, N. Jyothi, K. S. Viswanathan and K.S.V. Subbarao, Radar observations of 8.3 m scale equatorial spread F over Trivandrum, Ann. Geophys., 22, 911-922, 2004

Ghosh, A. K., Siddarth Shankar Das, A. K. Patra, D. Narayana Rao and A. R. Jain, Aspect sensitivity in the VHF radar backscatters studied using simultaneous observations of Gadanki MST radar and GPS-sonde, Ann. Geophys., 22, 4013-4023, 2004

Anandan, V. K., C. J. Pan, T. Rajalakshmi and G. Ramchandra Reddy, Multitaper spectral analysis of atmospheric radar signal, Ann. Geophys., 22, 3995-4003, 2004

Kagan, L. M., S. Fukao, M. Yamamoto and P. B. Rao, Observations of neutral winds and electric fields using backscatter from field-aligned irregularities., Int. J. Geomagn. Aeron., 5, GI1003, doi:10.1029/2003GI000056,2004

Patra, A. K., S. Sripathi, V. Sivakumar and P. B. Rao, Statistical characteristics of VHF radar observations of low latitude E region field-aligned irregularities over Gadanki, J. Atmos. Sol.. Terr. Phys., 66, 1615-1626, 2004

Sekar, R., D. Chakrabarty, R. Narayanan, S. Sripathi, A. K. Patra and K. S. V. Subbarao, Characterization of VHF radar structures associated with equatorial spread-F by narrow-band optical observations, Ann. Geophys, 22, 3129-3136, 2004

Patra, A. K., S.  Sripathi and D. Tiwari, Coupling effect of the equatorial F region irregularities on the low latitude E region instability processes, Geophys. Res. Lett., 31, L17803, doi: 10.1029/2004GL020486, 2004

Venkat Ratnam, M., G. Tetzlaff and Christoph Jacobi, Global and seasonal variations of stratospheric gravity wave activity deduced from the CHAMP/GPS satellite, JAS, 61, 1610-1620, 2004

Siddarth Shankar Das, K. Kishore Kumar, A. R. Jain, D. Narayana Rao and K. Nakamura, Observations of trapped humidity layer and Kelvin-Helmholtz instability using UHF radar and GPS sonde, Radio Sci., 39, doi: 10.1029/RS003003, 2004.