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Rao, P. B. ; Beig, G. ; Dabas, R. S. ; Ramkumar, Geetha ; Gurubaran, S. ; Rao, Kusuma G. ; Manoharan, P. K. ; Patra, A. K. ; Ravindran, Sudha ; Pant, Tarun K. ; Venkat Ratnam, M. ; Chakravartyi, S. C. ; Sridharan, R. (2012) An overview of CAWSES - India program with emphasis to equatorial atmospheric coupling processes Journal of Atmospheric and Terrestrial Physics, 75-76 . pp. 98-114. ISSN 0021-9169

Lakshmi Narayanan, V. ; Taori, A. ; Patra, A. K. ; Emperumal, K. ; Gurubaran, S. (2012) On the importance of wave-like structures in the occurrence of equatorial plasma bubbles: a case study Journal of Geophysical Research, 117 . A01306_1-A01306_8. ISSN 0148-0227

Patra, A. K. ; Pavan Chaitanya, P. ; Tiwari, D. (2011) Characteristics of 150 km echoes linked with solar eclipse and their implications to the echoing phenomenon Journal of Geophysical Research, 116 . A05319_1-A05319_9. ISSN 0148-0227

Patra, A. K. (2011) Descending ion layer property in the Gadanki radar observations of 150 km echoes and its implication to the echoing phenomenon Journal of Geophysical Research, 116 . A11322_1-A11322_6. ISSN 0148-0227

Taori, A. ; Patra, A. K. ; Joshi, L. M. (2011) Gravity wave seeding of equatorial plasma bubbles: an investigation with simultaneous F region, E region, and middle atmospheric measurements Journal of Geophysical Research, 116 . A05310_1-A05310_7. ISSN 0148-0227

Li, Guozhu ; Ning, Baiqi ; Patra, A. K. ; Wan, Weixing ; Hu, Lianhuan (2011) Investigation of low-latitude E and valley region irregularities: their relationship to equatorial plasma bubble bifurcation Journal of Geophysical Research, 116 . A11319_1-A11319_8. ISSN 0148-0227

Thampi, Smitha V. ; Yamamoto, Mamoru ; Liu, Huixin ; Saito, Susumu ; Otsuka, Yuichi ; Patra, Amit Kumar (2010) Night time-like quasi periodic echoes induced by a partial solar eclipse Geophysical Research Letters, 37 . L09107_1-L09107_6. ISSN 0094-8276

Jayaraman, A. ; Venkat Ratnam, M. ; Patra, A. K. ; Narayana Rao, T. ; Sridharan, S. ; Rajeevan, M. ; Gadhavi, H. ; Kesarkar, A. P. ; Srinivasulu, P. ; Raghunath, K. (2010) Study of atmospheric forcing and responses (SAFAR) campaign: overview Annales Geophysicae, 28 . pp. 89-101. ISSN 0992-7689

Venkat Ratnam, M. ; Patra, A. K. ; Krishna Murthy, B. V. (2010) Tropical mesopause: is it always close to 100 km? Journal of Geophysical Research, 115 . D06106_1-D06106_8. ISSN 0148-0227

Nath, Debashis ; Venkat Ratnam, M. ; Patra, A. K. ; Krishna Murthy, B. V. ; Vijaya Bhaskar Rao, S. (2010) Turbulence characteristics over tropical station Gadanki (13.5°N, 79.2°E) estimated using high-resolution GPS radiosonde data Journal of Geophysical Research, 115 . D07102_1-D07102_13. ISSN 0148-0227

Patra, A. K. ; Venkateswara Rao, N. ; Choudhary, R. K. (2009) Daytime low-altitude quasi-periodic echoes at Gadanki: understanding of their generation mechanism in the light of their Doppler characteristics Geophysical Research Letters, 36 . L05107_1-L05107_5. ISSN 0094-8276

Sridharan, S. ; Patra, A. K. ; Venkateswara Rao, N. ; Ramkumar, G. (2009) First simultaneous lidar observations of sodium layers and VHF radar observations of E-region field-aligned irregularities at the low-latitude station Gadanki Annales Geophysicae, 27 (9). pp. 3411-3419. ISSN 0992-7689

Patra, A. K. ; Phanikumar, D. V. ; Pant, T. K. (2009) Gadanki radar observations of F region field-aligned irregularities during June solstice of solar minimum: first results and preliminary analysis Journal of Geophysical Research, 114 . A12305_1-A12305_10. ISSN 0148-0227

Patra, A. K. ; Phanikumar, D. V. (2009) Intriguing aspects of F-region plasma irregularities revealed by the Gadanki radar observations during the SAFAR campaign Annales Geophysicae, 27 (10). pp. 3781-3790. ISSN 0992-7689

Phani Kumar, D. V. ; Patra, A. K. ; Kwak, Y. -S. ; Kim, K. -H. ; Yellaiah, G. (2009) Low latitude E-region irregularities studied using Gadanki radar, ionosonde and in situ measured electron density Astrophysics and Space Science, 323 (3). pp. 225-233. ISSN 0004-640X

Venkateswara Rao, N. ; Patra, A. K. ; Rao, S. V. B. (2009) Low-altitude quasi-periodic echoes studied using a large database of Gadanki radar observations Journal of Geophysical Research, 114 . A01313_1-A01313_11. ISSN 0148-0227

Patra, A. K. ; Choudhary, R. K. ; St. -Maurice, J. -P. (2009) Solar eclipse-induced E-region plasma irregularities observed by the Gadanki radar Geophysical Research Letters, 36 . L13105_1-L13105_5. ISSN 0094-8276

Yokoyama, T. ; Hysell, D. L. ; Patra, A. K. ; Otsuka, Y. ; Yamamoto, M. (2009) Zonal asymmetry of daytime 150-km echoes observed by Equatorial Atmosphere Radar in Indonesia Annales Geophysicae, 27 (3). pp. 967-974. ISSN 0992-7689

Patra, A. K. ; Venkateswara Rao, N. ; Phanikumar, D. V. ; Chandra, H. ; Das, U. ; Sinha, H. S. S. ; Pant, T. K. ; Sripathi, S. (2009) A study on the low-latitude daytime E region plasma irregularities using coordinated VHF radar, rocket-borne, and ionosonde observations Journal of Geophysical Research, 114 . A11301_1-A11301_10. ISSN 0148-0227

Patra, A. K. (2008) Some aspects of electrostatic coupling between E and F regions relevant to plasma irregularities: a review based on recent observations Journal of Atmospheric and Solar-Terrestrial Physicsh, 70 (17). pp. 2159-2171. ISSN 1364-6826

Patra, A. K. ; Yokoyama, T. ; Otsuka, Y. ; Yamamoto, M. (2008) Daytime 150-km echoes observed with the Equatorial Atmosphere Radar in Indonesia: first results Geophysical Research Letters, 35 . L06101_1-L06101_5. ISSN 0094-8276

Sekar, R. ; Chakrabarty, D. ; Narayanan, R. ; Patra, A. K. (2008) Equatorial spread F structures and associated airglow intensity variations observed over Gadanki Annales Geophysicae, 26 (12). pp. 3863-3873. ISSN 0992-7689

Chandra, H. ; Sinha, H. S. S. ; Das, U. ; Misra, R. N. ; Das, S. R. ; Datta, J. ; Chakravarty, S. C. ; Patra, A. K. ; Venkateswara Rao, N. ; Narayana Rao, D. (2008) First mesospheric turbulence study using coordinated rocket and MST radar measurements over Indian low latitude region Annales Geophysicae, 26 (9). pp. 2725-2738. ISSN 0992-7689

Venkat Ratnam, M. ; Kishore Kumar, G. ; Krishna Murthy, B. V. ; Patra, A. K. ; Jagannadha Rao, V. V. M. ; Vijaya Bhaskar Rao, S. ; Kishore Kumar, K. ; Ramkumar, Geetha (2008) Long-term variability of the low latitude mesospheric SAO and QBO and their relation with stratospheric QBO Geophysical Research Letters, 35 . L21809_1-L21809_5. ISSN 0094-8276

Kishore Kumar, G. ; Venkat Ratnam, M. ; Patra, A. K. ; Jagannadha Rao, V. V. M. ; Vijaya Bhaskar Rao, S. ; Kishore Kumar, K. ; Gurubaran, S. ; Ramkumar, Geetha ; Narayana Rao, D. (2008) Low-latitude mesospheric mean winds observed by Gadanki mesosphere stratosphere troposphere (MST) radar and comparison with rocket, High Resolution Doppler Imager (HRDI), and MF radar measurements and HWM93 Journal of Geophysical Research, 113 . D19117_1-D19117_12. ISSN 0148-0227

Kishore Kumar, G. ; Venkat Ratnam, M. ; Patra, A. K. ; Vijaya Bhaskara Rao, S. ; Russell, James (2008) Mean thermal structure of the low-latitude middle atmosphere studied using Gadanki Rayleigh lidar, Rocket, and SABER/TIMED observations Journal of Geophysical Research, 113 . D23106_1-D23106_10. ISSN 0148-0227

Phanikumar, D. V. ; Patra, A. K. ; Devasia, C. V. ; Yellaiah, G. (2008) Seasonal variation of low-latitude E-region plasma irregularities studied using Gadanki radar and ionosonde Annales Geophysicae, 26 (7). pp. 1865-1876. ISSN 0992-7689

Sripathi, S. ; Bose, S. ; Patra, A. K. ; Pant, T. K. ; Kakad, B. ; Bhattacharyya, A. (2008) Simultaneous observations of ESF irregularities over Indian region using radar and GPS Annales Geophysicae, 26 (11). pp. 3197-3213. ISSN 0992-7689

Venkateswara Rao, N. ; Patra, A. K. ; Rao, S. V. B. (2008) Some new aspects of low-latitude E-region QP echoes revealed by Gadanki radar: are they due to Kelvin-Helmholtz instability or gravity waves? Journal of Geophysical Research, 113 . A03309_1-A03309_13. ISSN 0148-0227

Das, S. S. ; Patra, A. K. ; Narayana Rao, D. (2008) VHF radar echoes in the vicinity of tropopause during the passage of tropical cyclone: first observations from the Gadanki MST radar Journal of Geophysical Research, 113 . D09113_1-D09113_10. ISSN 0148-0227

Kishore Kumar, G. ; Venkat Ratnam, M. ; Patra, A. K. ; Jagannadha Rao, V. V. M. ; Vijaya Bhaskara Rao, S. ; Narayana Rao, D. (2007) Climatology of low-latitude mesospheric echo characteristics observed by Indian mesosphere, stratosphere, and troposphere radar Journal of Geophysical Research, 112 . D06109_1-D06109_9. ISSN 0148-0227

Patra, A. K. ; Venkateswara Rao, N. (2007) Further investigations on 150-km echoing riddle using simultaneous observations of 150-km and E region echoes from off-electrojet location Gadanki Journal of Geophysical Research, 112 . A09301_1-A09301_10. ISSN 0148-0227

Sekar, R. ; Chakrabarty, D. ; Sarkhel, S. ; Patra, A. K. ; Devasia, C. V. ; Kelley, M. C. (2007) Identification of active fossil bubbles based on coordinated VHF radar and airglow measurements Annales Geophysicae, 25 (10). pp. 2099-2102. ISSN 0755-0685

Patra, A. K. ; Venkateswara Rao, N. (2007) Low-latitude valley region irregularities studied using the Gadanki radar Journal of Geophysical Research, 112 . A03303_1-A03303_9. ISSN 0148-0227

Patra, A. K. ; Yokoyama, T. ; Yamamoto, M. ; Nakamura, T. ; Tsuda, T. ; Fukao, S. (2007) Lower E region field-aligned irregularities studied using the Equatorial Atmosphere Radar and meteor radar in Indonesia Journal of Geophysical Research, 112 . A01301_1-A01301_10. ISSN 0148-0227

Chakrabarty, D. ; Sekar, R. ; Narayanan, R. ; Patra, A. K. ; Devasia, C. V. (2006) Effects of interplanetary electric field on the development of an equatorial spread F event Journal of Geophysical Research, 111 . A12316_1-A12316_7. ISSN 0148-0227

Patra, A. K. ; Sripathi, S. ; Rao, P. B. ; Choudhary, R. K. (2006) Gadanki radar observations of daytime E region echoes and structures extending down to 87 km Annales Geophysicae (1988), 24 (7). pp. 1861-1869. ISSN 0992-7689

Patra, A. K. ; Venkateswara Rao, N. (2006) Radar observations of daytime 150-km echoes from outside the equatorial electrojet belt over Gadanki Geophysical Research Letters, 33 . L03104_1-L03104_4. ISSN 0094-8276

Patra, A. K. ; Yokoyama, T. ; Yamamoto, M. ; Saito, S. ; Maruyama, T. ; Fukao, S. (2005) Disruption of E region echoes observed by the EAR during the development phase of equatorial spread F: a manifestation of electrostatic field coupling Geophysical Research Letters, 32 . L17104_1-L17104_4. ISSN 0094-8276

Patra, A. K. ; Tiwari, D. ; Devasia, C. V. ; Pant, T. K. ; Sridharan, R. (2005) East-west asymmetries of the equatorial electrojet 8.3 m type-2 echoes observed over Trivandrum and a possible explanation Journal of Geophysical Research, 110 . A11305_1-A11305_7. ISSN 0148-0227

Yokoyama, T. ; Patra, A. K. ; Fukao, S. ; Yamamoto, M. (2005) Ionospheric irregularities in the low-latitude valley region observed with the Equatorial Atmosphere Radar Journal of Geophysical Research, 110 . A10304_1-A10304_8. ISSN 0148-0227

Patra, A. K. ; Sripathi, S. ; Rao, P. B. ; Subbarao, K. S. V. (2005) Simultaneous VHF radar backscatter and ionosonde observations of low-latitude E region Annales Geophysicae, 23 (3). pp. 773-779. ISSN 0992-7689

Patra, A. K. ; Tiwari, D. ; Sripathi, S. ; Rao, P. B. ; Sridharan, R. ; Devasia, C. V. ; Viswanathan, K. S. ; Subbarao, K. S. V. ; Sekar, R. ; Kherani, E. A. (2005) Simultaneous radar observations of meter-scale F region irregularities at and off the magnetic equator over India Journal of Geophysical Research, 110 (A2). A02307_1-A02307_11. ISSN 0148-0227

Patra, A. K. ; Sripathi, S. ; Sivakumar, V. ; Rao, P. B. (2004) Statistical characteristics of VHF radar observations of low latitude E-region field-aligned irregularities over Gadanki Journal of Atmospheric and Solar-Terrestrial Physics, 66 (17). pp. 1615-1626. ISSN 1364-6826

Ghosh, A. K. ; Das, S. S. ; Patra, A. K. ; Rao, D. N. ; Jain, A. R. (2004) Aspect sensitivity in the VHF radar backscatters studied using simultaneous observations of Gadanki MST radar and GPS sonde Annales Geophysicae, 22 (11). pp. 4013-4023. ISSN 0755-0685

Sekar, R. ; Chakrabarty, D. ; Narayanan, R. ; Sripathi, S. ; Patra, A. K. ; Subbarao, K. S. V. (2004) Characterization of VHF radar observations associated with equatorial Spread F by narrow-band optical measurements Annales Geophysicae, 22 (9). pp. 3129-3136. ISSN 0992-7689

Patra, A. K. ; Sripathi, S. ; Tiwari, D. (2004) Coupling effect of the equatorial F region irregularities on the low latitude E region instability processes Geophysical Research Letters, 31 . L17803_1-L17803_4. ISSN 0094-8276

Tiwari, D. ; Patra, A. K. ; Devasia, C. V. ; Sridharan, R. ; Jyoti, N. ; Viswanathan, K. S. ; Subbarao, K. S. V. (2004) Radar observations of 8.3-m scale equatorial spread F irregularities over Trivandrum Annales Geophysicae, 22 (3). pp. 911-922. ISSN 0992-7689

Sripathi, S. ; Patra, A. K. ; Sivakumar, V. ; Rao, P. B. (2003) Shear instability as a source of the daytime quasi-periodic radar echoes observed by the Gadanki VHF radar Geophysical Research Letters, 30 (22). SSC5_1-SSC5_4. ISSN 0094-8276

Tiwari, Diwakar ; Patra, A. K. ; Viswanathan, K. S. ; Jyoti, N. ; Devasia, C. V. ; Subbarao, K. S. V. ; Sridharan, R. (2003) Simultaneous radar observations of the electrojet plasma irregularities at 18 and 54.95 MHz over Trivandrum, India Journal of Geophysical Research, 108 (A10). SIA3_1-SIA3_13. ISSN 0148-0227

Raghavarao, R. ; Patra, A. K. ; Sripathi, S. (2002) Equatorial E region irregularities: a review of recent observations Journal of Atmospheric and Solar-Terrestrial Physics, 64 (12-14). pp. 1435-1443. ISSN 1364-6826

Patra, A. K. ; Rao, P. B. ; Anandan, V. K. ; Jain, A. R. ; Viswanathan, G. (2002) Evidence of intermediate layer characteristics in the Gadanki radar observations of the upper E region field-aligned irregularities Geophysical Research Letters, 29 . pp. 1696-1699. ISSN 0094-8276

Patra, A. K. ; Sripathi, S. ; Siva Kumar, V. ; Rao, P. B. (2002) Evidence of kilometer-scale waves in the lower E region from high resolution VHF radar observations over Gadanki Geophysical Research Letters, 29 . pp. 1499-1500. ISSN 0094-8276

Patra, A. K. (2002) On the interpretation of the VHF radar echoes from the equatorial lower E region Geophysical Research Letters, 29 . pp. 1695-1698. ISSN 0094-8276

Sekar, R. ; Kherani, E. A. ; Rao, P. B. ; Patra, A. K. (2001) Interaction of two long-wavelength modes in the nonlinear numerical simulation model of equatorial spread F Journal of Geophysical Research, 106 (A11). pp. 24765-24775. ISSN 0148-0227

Jain, A. R. ; Rao, Y. Jaya ; Patra, A. K. ; Rao, P. B. ; Viswanathan, G. ; Subramanian, S. K. (2000) Observations of tropical convection events using Indian MST radar: First results Quarterly Journal of the Royal Meteorological Society, 126 (570). pp. 3097-3115. ISSN 0035-9009

Jain, A. R. ; Jaya Rao, Y. ; Patra, A. K. ; Rao, P. B. ; Viswanathan, G. ; Subramanian, S. K. (2000) Observations of tropical convection events using Indian MST radar: first results The Quarterly Journal of the Royal Meteorological Society, 126 (570). pp. 3097-3115. ISSN 0035-9009

Sekar, R. ; Kherani, E. A. ; Viswanathan, K. S. ; Devasia, C. V. ; Subbarao, K. S. V. ; Tiwari, D. ; Ramachandran, N. ; Patra, A. K. ; Rao, P. B. (2000) Preliminary results on equatorial spread F irregularities by VHF and HF radars Indian Journal of Radio and Space Physics, 29 (4). pp. 262-271. ISSN 0367-8393

Patra, A. K. ; Rao, P. B. (1999) High-resolution radar measurements of turbulent structure in the low-latitude E region Journal of Geophysical Research, 104 (A11). pp. 24667-24673. ISSN 0148-0227

Rao, P. B. ; Patra, A. K. (1998) Recent advances on equatorial spread F Proceedings of the Indian National Science Academy - Part A: Physical Sciences, 64A (3). pp. 365-375. ISSN 0370-0046

Krishna Murthy, B. V. ; Ravindran, Sudha ; Viswanathan, K. S. ; Subbarao, K. S. V. ; Patra, A. K. ; Rao, P. B. (1998) Small-scale (~3 m) E region irregularities at and off the magnetic equator Journal of Geophysical Research, 103 (A9). pp. 20761-20773. ISSN 0148-0227

Patra, A. K. ; Rao, P. B. ; Anandan, V. K. ; Jain, A. R. (1997) Radar observations of 2.8 m equatorial spread-F irregularities Journal of Atmospheric and Solar-Terrestrial Physics, 59 (13). pp. 1633-1641. ISSN 1364-6826

Rao, P. B. ; Patra, A. K. ; Chandrasekhar Sarma, T. V. ; Krishna Murthy, B. V. ; Subba Rao, K. S. V. ; Hari, S. S. (1997) Radar observations of updrafting and downdrafting plasma depletions associated with the equatorial spread F Radio Science, 32 (3). pp. 1215-1227. ISSN 0048-6604

Patra, A. K. ; Anandan, V. K. ; Rao, P. B. ; Jain, A. R. (1995) First observations of equatorial spread F from Indian MST radar Radio Science, 30 (4). pp. 1159-1165. ISSN 0048-6604