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G. Ramkumar · SciRah

Researcher profile · Semantic Scholar

G. Ramkumar

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G. Ramkumar — researcher profile on SciRah

h-index: 25
Works: 92
Citations: 1,546

Most-cited papers

Planetary wave coupling (5-6-day waves) in the low-latitude atmosphere-ionosphere system
D. Pancheva, P. Mukhtarov, N. Mitchell, D. Fritts +6 more
200877 citations Open access
Semantic Scholar
Meteor wind radar observations of gravity wave momentum fluxes and their forcing toward the Mesospheric Semiannual Oscillation
T. M. Antonita, G. Ramkumar, Karanam Kishore Kumar, Vinay Deepa
200869 citations
Semantic Scholar
Mean winds and tidal components during counter electrojet events
V. V. Somayajulu, L. Cherian, K. Rajeev, G. Ramkumar +1 more
199354 citations
Semantic Scholar
Initial results from SKiYMET meteor radar at Thumba (8.5°N, 77°E): 1. Comparison of wind measurements with MF spaced antenna radar system
Karanam Kishore Kumar, G. Ramkumar, S. T. Shelbi
200751 citations Open access
Semantic Scholar
Influence of tropical cyclones on tropospheric ozone: possible implications
S. Das, M. Ratnam, K. N. Uma, K. Subrahmanyam +8 more
201647 citations Open access
Semantic Scholar
Tropical tropopause dynamics (TTD) campaigns over Indian region: An overview
M. Ratnam, S. V. Sunilkumar, K. Parameswaran, B. V. Krishna Murthy +9 more
201445 citations
Semantic Scholar
Characteristics of turbulence in the troposphere and lower stratosphere over the Indian Peninsula
S. V. Sunilkumar, M. Muhsin, K. Parameswaran, M. Ratnam +7 more
201543 citations
Semantic Scholar
Long‐term variability of the low latitude mesospheric SAO and QBO and their relation with stratospheric QBO
M. Ratnam, G. K. Kumar, B. V. Krishna Murthy, A. Patra +4 more
200840 citations Open access
Semantic Scholar
Mesosphere and lower thermosphere zonal wind variations over low latitudes: Relation to local stratospheric zonal winds and global circulation anomalies
G. K. Kumar, K. K. Kumar, W. Singer, C. Zülicke +5 more
201437 citations
Semantic Scholar
Altitude profiles of temperature from 4 to 80 km over the tropics from MST radar and lidar
K. Parameswaran, M. Sasi, G. Ramkumar, P. Nair +11 more
200037 citations
Semantic Scholar
Local Time Dependence of the Thermal Structure in the Venusian Equatorial Upper Atmosphere: Comparison of Akatsuki Radio Occultation Measurements and GCM Results
H. Ando, M. Takagi, T. Fukuhara, T. Imamura +15 more
2018Journal of Geophysical Research - Planets35 citations Open access
Semantic Scholar
Vertical propagation characteristics and seasonal variability of tidal wind oscillations in the MLT region over Trivandrum (8.5° N, 77° E): first results from SKiYMET Meteor Radar
V. Deepa, G. Ramkumar, M. Antonita, Karanam Kishore Kumar +1 more
200635 citations Open access
Semantic Scholar
Gravity wave signatures in the dip equatorial ionosphere‐thermosphere system during the annular solar eclipse of 15 January 2010
G. Manju, M. K. Madhav Haridas, G. Ramkumar, T. Pant +2 more
201431 citations
Semantic Scholar
A quantitative study on the role of gravity waves in driving the tropical Stratospheric Semiannual Oscillation
T. Maria Antonita, G. Ramkumar, Karanam Kishore Kumar, K. S. Appu +1 more
200731 citations
Semantic Scholar
Stratospheric intrusion into the troposphere during the tropical cyclone Nilam (2012)
S. Das, M. Ratnam, K. N. Uma, A. Patra +5 more
201630 citations
Semantic Scholar
Temporal modulations of the longitudinal structure in F2 peak height in the equatorial ionosphere as observed by COSMIC
Gui-Ping Liu, T. Immel, S. England, Karanam Kishore Kumar +1 more
200930 citations Open access
Semantic Scholar
Signatures of low latitude–high latitude coupling in the tropical MLT region during sudden stratospheric warming
C. Vineeth, T. Pant, Karanam Kishore Kumar, G. Ramkumar +1 more
200930 citations
Semantic Scholar
On the signature of the quasi‐3‐day wave in the thermosphere during the January 2010 URSI World Day Campaign
S. England, Gui-Ping Liu, Qihou Zhou, T. Immel +2 more
201229 citations
Semantic Scholar
On the tropospheric origin of Mesosphere Lower Thermosphere region intraseasonal wind variability
Karanam Kishore Kumar, T. M. Antonita, G. Ramkumar, Vinay Deepa +2 more
200729 citations Open access
Semantic Scholar
Diurnal variation of atmospheric stability and turbulence during different seasons in the troposphere and lower stratosphere derived from simultaneous radiosonde observations at two tropical stations, in the Indian Peninsula
M. Muhsin, S. V. Sunilkumar, M. Ratnam, K. Parameswaran +3 more
201628 citations
Semantic Scholar
Signatures of the 3-day wave in the low-latitude and midlatitude ionosphere during the January 2010 URSI World Day campaign
Gui-Ping Liu, S. England, T. Immel, Karanam Kishore Kumar +2 more
201228 citations
Semantic Scholar
Meteor radar observations of short‐term variability of quasi 2 day waves and their interaction with tides and planetary waves in the mesosphere–lower thermosphere region over Thumba (8.5°N, 77°E)
Veena Suresh Babu, Karanam Kishore Kumar, S. R. John, K. Subrahmanyam +1 more
201127 citations
Semantic Scholar
Temporal modulation of the four‐peaked longitudinal structure of the equatorial ionosphere by the 2 day planetary wave
Gui-Ping Liu, T. Immel, S. England, Karanam Kishore Kumar +1 more
201026 citations
Semantic Scholar
Inertia‐gravity waves associated with the tropical easterly jet over the Indian subcontinent during the South West Monsoon Period
M. Sasi, G. Ramkumar, Vinay Deepa, B. V. K. Murthy
200026 citations
Semantic Scholar
Equatorial waves in temperature in the altitude range 4 to 70 km
B. V. Krishna Murthy, K. Satheesan, K. Parameswaran, M. Sasi +4 more
200225 citations
Semantic Scholar
Nonmigrating diurnal tides in the troposphere and lower stratosphere over Gadanki (13.5°N, 79.2°E)
M. Sasi, G. Ramkumar, V. Deepa
199825 citations
Semantic Scholar
Seasonal variation of gravity waves in the Equatorial Middle Atmosphere: results from ISRO's Middle Atmospheric Dynamics (MIDAS) program
G. Ramkumar, T. M. Antonita, Y. Kumar, H. Kumar +1 more
200624 citations Open access
Semantic Scholar
A comparative study of daytime mesopause temperatures obtained using unique ground based optical and meteor wind radar techniques over the magnetic equator
C. Vineeth, T. Pant, M. Antonita, G. Ramkumar +2 more
200524 citations
Semantic Scholar
Impacts of atmospheric ultrafast Kelvin waves on radio scintillations in the equatorial ionosphere
Gui-Ping Liu, T. Immel, Scott L. England, H. U. Frey +3 more
201323 citations Open access
Semantic Scholar
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
G. K. Kumar, M. Ratnam, A. Patra, V. V. M. Jagannadha Rao +5 more
200823 citations Open access
Semantic Scholar
Four‐decadal climatological intercomparison of rocketsonde and radiosonde with different reanalysis data: results from Thumba Equatorial Station
S. Das, K. N. Uma, V. N. Bineesha, K. V. Suneeth +1 more
201622 citations
Semantic Scholar
Simultaneous observations of SAO and QBO in winds, temperature and ozone in the tropical middle atmosphere over Thumba (8.5°N, 77°E)
Karanam Kishore Kumar, D. Swain, S. R. John, G. Ramkumar
201122 citations
Semantic Scholar
Planetary waves in the mesosphere lower thermosphere during stratospheric sudden warming: observations using a network of meteor radars from high to equatorial latitudes
N. Koushik, K. Kumar, G. Ramkumar, K. Subrahmanyam +4 more
2020Climate Dynamics21 citations
Semantic Scholar
Simultaneous observation of quasi 16 day wave in the mesospheric winds and temperature over low latitudes with the SKiYMET radar
S. Das, K. K. Kumar, S. B. Veena, G. Ramkumar
201021 citations Open access
Semantic Scholar
Temperature perturbations in the troposphere-stratosphere over Thumba (8.5 N, 76.9 E) during the solar eclipse 2009/2010
K. Subrahmanyam, G. Ramkumar, K. Kumar, D. Swain +8 more
201118 citations Open access
Semantic Scholar
Climatologies of tidal winds in the radio-meteor region over Trivandrum (8°N)
C. Reddi, G. Ramkumar
199718 citations
Semantic Scholar
Validation of MERRA reanalysis upper-level winds over low latitudes with independent rocket sounding data
G. K. Kumar, K. Kumar, G. Baumgarten, G. Ramkumar
201517 citations
Semantic Scholar
A case study on occurrence of an unusual structure in the sodium layer over Gadanki, India
S. Sarkhel, J. Mathews, S. Raizada, Ramanathan Sekar +10 more
2015Earth, Planets and Space17 citations Open access
Semantic Scholar
Effects of annular solar eclipse of 15 January 2010 on meteorological parameters in the 0 to 65 km region over Thumba, India
K. V. S. Namboodiri, P. K. Dileep, Koshy Mammen, G. Ramkumar +4 more
201117 citations
Semantic Scholar
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
Vinay Deepa, G. Ramkumar, T. M. Antonita, Karanam Kishore Kumar
200816 citations
Semantic Scholar
A study of equatorial wave characteristics using rockets, balloons, lidar and radar
M. Sasi, B. V. Krishna Murthy, G. Ramkumar, K. Satheesan +13 more
200316 citations
Semantic Scholar
Response of equatorial and low latitude mesosphere lower thermospheric dynamics to the northern hemispheric sudden stratospheric warming events
N. Koushik, Karanam Kishore Kumar, G. Ramkumar, K. Subrahmanyam
201815 citations
Semantic Scholar
Long period wind oscillations in the meteor region over Trivandrum (8°N, 77°E)
C. Reddi, G. Ramkumar
199515 citations
Semantic Scholar
Gravity waves observed from the Equatorial Wave Studies (EWS) campaign during 1999 and 2000 and their role in the generation of stratospheric semiannual oscillations
Vinay Deepa, G. Ramkumar, B. V. K. Murthy
200614 citations Open access
Semantic Scholar
Quantification of gravity wave forcing in driving the stratospheric Quasi‐Biennial Oscillation
T. Maria Antonita, G. Ramkumar, Karanam Kishore Kumar, S. Sunil Kumar
200813 citations Open access
Semantic Scholar
First observations of quasi 120 day oscillation in Mesospheric winds and temperature: Observations inferred from Meteor Radar
S. Das, Karanam Kishore Kumar, G. Ramkumar
201312 citations Open access
Semantic Scholar
Tidal wind oscillations in the tropical lower atmosphere as observed by Indian MST Radar
M. Sasi, G. Ramkumar, V. Deepa
200112 citations Open access
Semantic Scholar
Seasonal variation of planetary wave momentum flux and the forcing towards mean flow acceleration in the MLT region
Veena Suresh Babu, G. Ramkumar, S. R. John
201211 citations
Semantic Scholar
Observations of peculiar sporadic sodium structures and their relation with wind variations
S. Sridharan, P. V. Prasanth, Y. Kumar, G. Ramkumar +2 more
200911 citations
Semantic Scholar
The annual and semi-annual wind fields in low latitudes
C. Reddi, G. Ramkumar
199711 citations
Semantic Scholar

Frequent co-authors

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Karanam Kishore Kumar×16
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Karanam Kishore Kumar — researcher profile on SciRah
S. Das×7
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S. Das — researcher profile on SciRah
M. Ratnam×7
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M. Ratnam — researcher profile on SciRah
K. Subrahmanyam×7
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K. Subrahmanyam — researcher profile on SciRah

B. V. Krishna Murthy

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M. Sasi — researcher profile on SciRah

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Vinay Deepa — researcher profile on SciRah

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K. Rajeev — researcher profile on SciRah

K. Parameswaran×5

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K. Parameswaran — researcher profile on SciRah

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K. Kumar — researcher profile on SciRah

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G. K. Kumar — researcher profile on SciRah

Gui-Ping Liu×5

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Gui-Ping Liu — researcher profile on SciRah