First-authored, refereed papers of Rajkumar Hajra

A list of first-authored, refereed publications of Rajkumar Hajra, derived from the SAO/NASA Astrophysics Data System (ADS). The number in brackets after each title indicates the number of citations that the paper has received.

Orcid ID: 0000-0003-0447-1531

List of publications ordered by citations
Number of papers: 40
No. of citations: 876

2025

1. Solar Cycle and Seasonal Dependences of Field-Aligned Currents [2]
   Hajra, Rajkumar, Tsurutani, Bruce T., Lu, Quanming, Du, Aimin, Lu, San & Echer, Ezequiel, Space Weather, 23, e2025SW004441
2. Field-Aligned Currents During High-Intensity Long-Duration Continuous Auroral Electrojet Activity Events: Seasonal Dependences [0]
   Hajra, Rajkumar, Tsurutani, Bruce T., Lu, Quanming & Du, Aimin, Space Weather, 23, e2025SW004354
3. Field-Aligned Currents During High-Intensity Long-Duration Continuous Auroral Electrojet Activity Events: A Statistical Study [0]
   Hajra, Rajkumar, Tsurutani, Bruce T., Lu, Quanming, Du, Aimin, Lu, San & Gao, Xinliang, Space Weather, 23, e2025SW004353
4. Supersubstorms during the May 2024 superstorm [0]
   Hajra, Rajkumar, Tsurutani, Bruce T., Lu, Quanming, Du, Aimin & Lakhina, Gurbax S., Journal of Space Weather and Space Climate, 15, 51

2024

1. The April 2023 SYM-H = −233 nT Geomagnetic Storm: A Classical Event [17]
   Hajra, Rajkumar, Tsurutani, Bruce Tsatnam, Lu, Quanming, Horne, Richard B., Lakhina, Gurbax Singh, Yang, Xu, Henri, Pierre, Du, Aimin, Gao, Xingliang, Wang, Rongsheng & Lu, San, Journal of Geophysical Research (Space Physics), 129, e2024JA032986
2. Interplanetary Causes and Impacts of the 2024 May Superstorm on the Geosphere: An Overview [38]
   Hajra, Rajkumar, Tsurutani, Bruce Tsatnam, Lakhina, Gurbax Singh, Lu, Quanming & Du, Aimin, ApJ, 974, 264
3. Ultra-relativistic Electron Acceleration during High-intensity Long-duration Continuous Auroral Electrojet Activity Events [6]
   Hajra, Rajkumar, Tsurutani, Bruce T., Lu, Quanming, Lakhina, Gurbax S., Du, Aimin, Echer, Ezequiel, Franco, Adriane M. S., Bolzan, Mauricio J. A. & Gao, Xinliang, ApJ, 965, 146

2023

1. Near-Earth High-Speed and Slow Solar Winds: A Statistical Study on Their Characteristics and Geomagnetic Impacts [5]
   Hajra, Rajkumar, Solar Physics, 298, 53
2. Extreme Rarefaction of Solar Wind: A Study on Origin and Characteristics Using Ulysses Observations [1]
   Hajra, Rajkumar, Tsurutani, Bruce T., Lu, Quanming, Shan, Lican, Du, Aimin, Wang, Rongsheng, Lu, San & Gao, Xinliang, ApJ, 955, 120
3. Interplanetary Shocks between 0.3 and 1.0 au: Helios 1 and 2 Observations [10]
   Hajra, Rajkumar, Tsurutani, Bruce T., Lakhina, Gurbax S., Lu, Quanming, Du, Aimin & Shan, Lican, ApJ, 951, 75
4. Earth's magnetotail variability during supersubstorms (SSSs): A study on solar wind-magnetosphere-ionosphere coupling [6]
   Hajra, Rajkumar, Echer, Ezequiel, Franco, Adriane Marques de Souza & Bolzan, Mauricio José Alves, Advances in Space Research, 72, 1208

2022

1. Intense, Long-Duration Geomagnetically Induced Currents (GICs) Caused by Intense Substorm Clusters [13]
   Hajra, Rajkumar, Space Weather, 20, e2021SW002937
2. Interplanetary Sheaths and Corotating Interaction Regions: A Comparative Statistical Study on Their Characteristics and Geoeffectiveness [10]
   Hajra, Rajkumar, Sunny, Jibin V., Babu, Megha & Nair, Archana Giri, Solar Physics, 297, 97
3. Corotating Interaction Regions during Solar Cycle 24: A Study on Characteristics and Geoeffectiveness [28]
   Hajra, Rajkumar & Sunny, Jibin V., Solar Physics, 297, 30
4. Intense Geomagnetically Induced Currents (GICs): Association with Solar and Geomagnetic Activities [10]
   Hajra, Rajkumar, Solar Physics, 297, 14
5. Near-Earth Sub-Alfvénic Solar Winds: Interplanetary Origins and Geomagnetic Impacts [22]
   Hajra, Rajkumar & Tsurutani, Bruce T., ApJ, 926, 135

2021

1. September 2017 Space-Weather Events: A Study on Magnetic Reconnection and Geoeffectiveness [9]
   Hajra, Rajkumar, Solar Physics, 296, 50
2. Weakest Solar Cycle of the Space Age: A Study on Solar Wind-Magnetosphere Energy Coupling and Geomagnetic Activity [27]
   Hajra, Rajkumar, Solar Physics, 296, 33
3. Long Term Variations of the Geomagnetic Activity: A Comparison Between the Strong and Weak Solar Activity Cycles and Implications for the Space Climate [24]
   Hajra, Rajkumar, Marques de Souza Franco, Adriane, Echer, Ezequiel & José Alves Bolzan, Mauricio, Journal of Geophysical Research (Space Physics), 126, e28695
4. Variation of the Interplanetary Shocks in the Inner Heliosphere [13]
   Hajra, Rajkumar, ApJ, 917, 91
5. Seasonal dependence of the Earth's radiation belt ─ new insights [6]
   Hajra, Rajkumar, Annales Geophysicae, 39, 181

2020

1. The Complex Space Weather Events of 2017 September [44]
   Hajra, Rajkumar, Tsurutani, Bruce T. & Lakhina, Gurbax S., ApJ, 899, 3
2. Ionospheric total electron content of comet 67P/Churyumov-Gerasimenko [3]
   Hajra, Rajkumar, Henri, Pierre, Vallières, Xavier, Galand, Marina, Rubin, Martin, Tsurutani, Bruce T., Gilet, Nicolas, Bucciantini, Luca & Nemeth, Zoltan, A&A, 635, A51

2018

1. Cometary plasma response to interplanetary corotating interaction regions during 2016 June-September: a quantitative study by the Rosetta Plasma Consortium [29]
   Hajra, Rajkumar, Henri, Pierre, Myllys, Minna, Héritier, Kevin L., Galand, Marina, Simon Wedlund, Cyril, Breuillard, Hugo, Behar, Etienne, Edberg, Niklas J. T., Goetz, Charlotte, Nilsson, Hans, Eriksson, Anders I., Goldstein, Raymond, Tsurutani, Bruce T., Moré, Jerome, Vallières, Xavier & Wattieaux, Gaetan, MNRAS, 480, 4544
2. Dynamic unmagnetized plasma in the diamagnetic cavity around comet 67P/Churyumov-Gerasimenko [19]
   Hajra, Rajkumar, Henri, Pierre, Vallières, Xavier, Moré, Jerome, Gilet, Nicolas, Wattieaux, Gaetan, Goetz, Charlotte, Richter, Ingo, Tsurutani, Bruce T., Gunell, Herbert, Nilsson, Hans, Eriksson, Anders I., Nemeth, Zoltan, Burch, James L. & Rubin, Martin, MNRAS, 475, 4140
3. Interplanetary Shocks Inducing Magnetospheric Supersubstorms (SML < -2500 nT): Unusual Auroral Morphologies and Energy Flow [44]
   Hajra, Rajkumar & Tsurutani, Bruce T., ApJ, 858, 123

2017

1. Impact of a cometary outburst on its ionosphere. Rosetta Plasma Consortium observations of the outburst exhibited by comet 67P/Churyumov-Gerasimenko on 19 February 2016 [27]
   Hajra, R., Henri, P., Vallières, X., Galand, M., Héritier, K., Eriksson, A. I., Odelstad, E., Edberg, N. J. T., Burch, J. L., Broiles, T., Goldstein, R., Glassmeier, K. H., Richter, I., Goetz, C., Tsurutani, B. T., Nilsson, H., Altwegg, K. & Rubin, M., A&A, 607, A34
2. High-speed solar wind stream effects on the topside ionosphere over Arecibo: A case study during solar minimum [14]
   Hajra, Rajkumar, Tsurutani, Bruce T., Brum, Christiano G. M. & Echer, Ezequiel, Geophysical Research Letters, 44, 7607

2016

1. An empirical model of ionospheric total electron content (TEC) near the crest of the equatorial ionization anomaly (EIA) [30]
   Hajra, Rajkumar, Chakraborty, Shyamal Kumar, Tsurutani, Bruce T., DasGupta, Ashish, Echer, Ezequiel, Brum, Christiano G. M., Gonzalez, Walter D. & Sobral, José Humberto Andrade, Journal of Space Weather and Space Climate, 6, A29
2. Supersubstorms (SML < -2500 nT): Magnetic storm and solar cycle dependences [55]
   Hajra, Rajkumar, Tsurutani, Bruce T., Echer, Ezequiel, Gonzalez, Walter D. & Gjerloev, Jesper W., Journal of Geophysical Research (Space Physics), 121, 7805

2015

1. Relativistic electron acceleration during HILDCAA events: are precursor CIR magnetic storms important? [30]
   Hajra, Rajkumar, Tsurutani, Bruce T., Echer, Ezequiel, Gonzalez, Walter D., Brum, Christiano Garnett Marques, Vieira, Luis Eduardo Antunes & Santolik, Ondrej, Earth, Planets and Space, 67, 109
2. Relativistic (e > 0.6, > 2.0, and > 4.0 MeV) Electron Acceleration at Geosynchronous Orbit during High-intensity, Long-duration, Continuous AE Activity (HILDCAA) Events [68]
   Hajra, Rajkumar, Tsurutani, Bruce T., Echer, Ezequiel, Gonzalez, Walter D. & Santolik, Ondrej, ApJ, 799, 39

2014

1. Solar wind-magnetosphere energy coupling efficiency and partitioning: HILDCAAs and preceding CIR storms during solar cycle 23 [48]
   Hajra, Rajkumar, Echer, Ezequiel, Tsurutani, Bruce T. & Gonzalez, Walter D., Journal of Geophysical Research (Space Physics), 119, 2675
2. Superposed epoch analyses of HILDCAAs and their interplanetary drivers: Solar cycle and seasonal dependences [31]
   Hajra, Rajkumar, Echer, Ezequiel, Tsurutani, Bruce T. & Gonzalez, Walter D., Journal of Atmospheric and Solar-Terrestrial Physics, 121, 24
3. Relativistic electron acceleration during high-intensity, long-duration, continuous AE activity (HILDCAA) events: Solar cycle phase dependences [58]
   Hajra, Rajkumar, Tsurutani, Bruce T., Echer, Ezequiel & Gonzalez, Walter D., Geophysical Research Letters, 41, 1876

2013

1. Solar cycle dependence of High-Intensity Long-Duration Continuous AE Activity (HILDCAA) events, relativistic electron predictors? [101]
   Hajra, R., Echer, E., Tsurutani, B. T. & Gonzalez, W. D., Journal of Geophysical Research (Space Physics), 118, 5626

2012

1. Evolution of equatorial irregularities under varying electrodynamical conditions: A multitechnique case study from Indian longitude zone [9]
   Hajra, R., Chakraborty, S. K., Mazumdar, S. & Alex, S., Journal of Geophysical Research (Space Physics), 117, A08331

2011

1. Equatorial ionospheric responses in relation to the occurrence of main phase of intense geomagnetic storms in the local dusk sector [4]
   Hajra, R. & Chakraborty, S. K., Journal of Atmospheric and Solar-Terrestrial Physics, 73, 760

2010

1. Ionospheric effects near the magnetic equator and the anomaly crest of the Indian longitude zone during a large number of intense geomagnetic storms [4]
   Hajra, R., Chakraborty, S. K. & Dasgupta, A., Journal of Atmospheric and Solar-Terrestrial Physics, 72, 1299

2009

1. Electrodynamical control of the ambient ionization near the equatorial anomaly crest in the Indian zone during counter electrojet days [11]
   Hajra, R., Chakraborty, S. K. & Paul, A., Radio Science, 44, RS3009