All Stories

  1. Interplanetary Shocks Inducing Magnetospheric Supersubstorms (SML < −2500 nT): Unusual Auroral Morphologies and Energy Flow

    Article • The Astrophysical Journal, May 2018, American Astronomical Society

    Dr Rajkumar Hajra

  2. Plasma density structures at comet 67P/Churyumov–Gerasimenko

    Article • Monthly Notices of the Royal Astronomical Society, April 2018, Oxford University Press (OUP)

    Dr Rajkumar Hajra

  3. Comment on “Modeling Extreme “Carrington-Type” Space Weather Events Using Three-Dimensional Global MHD Simulations” by C. M. Ngwira, A. Pulkkinen, M. M. Kuznetsova, and A. Glocer”

    Article • Journal of Geophysical Research Space Physics, February 2018, Wiley

    Dr Rajkumar Hajra

  4. Cross-correlation and cross-wavelet analyses of the solar wind IMF <i>B</i><sub><i>z</i></sub> and auroral electrojet index AE coupling during HILDCAAs

    Article • Annales Geophysicae, February 2018, Copernicus GmbH

    Dr Rajkumar Hajra

  5. A correlation study regarding the AE index and ACE solar wind data for Alfvénic intervals using wavelet decomposition and reconstruction

    Article • Nonlinear Processes in Geophysics, January 2018, Copernicus GmbH

    Dr Rajkumar Hajra

  6. Dynamic unmagnetized plasma in the diamagnetic cavity around comet 67P/Churyumov–Gerasimenko

    Article • Monthly Notices of the Royal Astronomical Society, January 2018, Oxford University Press (OUP)

    Dr Rajkumar Hajra

  7. Magnetospheric “Killer” Relativistic Electron Dropouts (REDs) and Repopulation: A Cyclical Process

    Article • January 2018, Elsevier

    Dr Rajkumar Hajra

  8. High-speed solar wind stream effects on the topside ionosphere over Arecibo: A case study during solar minimum

    Article • Geophysical Research Letters, August 2017, Wiley

    Dr Rajkumar Hajra

  9. A correlation study regarding the AE index and ACE solar wind data for Alfvénic intervals using wavelet decomposition and reconstruction

    Article • Nonlinear Processes in Geophysics Discussions, August 2017, Copernicus GmbH

    Dr Rajkumar Hajra

  10. Characterization of high-intensity, long-duration continuous auroral activity (HILDCAA) events using recurrence quantification analysis

    Article • Nonlinear Processes in Geophysics, August 2017, Copernicus GmbH

    Dr Rajkumar Hajra

  11. 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

    Article • Astronomy and Astrophysics, July 2017, EDP Sciences

    Dr Rajkumar Hajra

  12. Diamagnetic region(s): structure of the unmagnetized plasma around Comet 67P/CG

    Article • Monthly Notices of the Royal Astronomical Society, June 2017, Oxford University Press (OUP)

    Dr Rajkumar Hajra

  13. Heliospheric plasma sheet (HPS) impingement onto the magnetosphere as a cause of relativistic electron dropouts (REDs) via coherent EMIC wave scattering with possible consequences for climate change mechanisms

    Article • Journal of Geophysical Research Space Physics, October 2016, American Geophysical Union (AGU)

    Dr Rajkumar Hajra

  14. A study on the main periodicities in interplanetary magnetic field Bz component and geomagnetic AE index during HILDCAA events using wavelet analysis

    Article • Journal of Atmospheric and Solar-Terrestrial Physics, September 2016, Elsevier

    Dr Rajkumar Hajra

  15. Supersubstorms (SML < −2500 nT): Magnetic storm and solar cycle dependences

    Article • Journal of Geophysical Research Space Physics, August 2016, American Geophysical Union (AGU)

    Dr Rajkumar Hajra

  16. Comparison of geophysical patterns in the southern hemisphere mid-latitude region

    Article • Advances in Space Research, April 2016, Elsevier

    Dr Rajkumar Hajra

  17. Estimation of energy budget of ionosphere-thermosphere system during two CIR-HSS events: observations and modeling

    Article • Journal of Space Weather and Space Climate, January 2016, EDP Sciences

    Dr Rajkumar Hajra

  18. An empirical model of ionospheric total electron content (TEC) near the crest of the equatorial ionization anomaly (EIA)

    Article • Journal of Space Weather and Space Climate, January 2016, EDP Sciences

    Dr Rajkumar Hajra

  19. Electromagnetic cyclotron waves in the dayside subsolar outer magnetosphere generated by enhanced solar wind pressure: EMIC wave coherency

    Article • Journal of Geophysical Research Space Physics, September 2015, American Geophysical Union (AGU)

    Dr Rajkumar Hajra

  20. Interplanetary Alfvén Waves, HILDCAAs, Acceleration of Magnetospheric Relativistic “Killer” Electrons and Auroral Zone Heating

    Article • August 2015, Society of Exploration Geophysicists

    Dr Rajkumar Hajra

  21. Relativistic electron acceleration during HILDCAA events: are precursor CIR magnetic storms important?

    Article • Earth Planets and Space, July 2015, Springer Science + Business Media

    Dr Rajkumar Hajra

  22. Extremely intense (SML ≤–2500 nT) substorms: isolated events that are externally triggered?

    Article • Annales Geophysicae, May 2015, Copernicus GmbH

    Dr Rajkumar Hajra

  23. Medium-Range Thermosphere-Ionosphere Storm Forecasts

    Article • Space Weather, March 2015, American Geophysical Union (AGU)

    Dr Rajkumar Hajra

  24. 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

    Article • The Astrophysical Journal, January 2015, Institute of Physics Publishing

    Dr Rajkumar Hajra

  25. Superposed epoch analyses of HILDCAAs and their interplanetary drivers: Solar cycle and seasonal dependences

    Article • Journal of Atmospheric and Solar-Terrestrial Physics, December 2014, Elsevier

    Dr Rajkumar Hajra

  26. Solar wind‐magnetosphere energy coupling efficiency and partitioning: HILDCAAs and preceding CIR storms during solar cycle 23

    Article • Journal of Geophysical Research Space Physics, April 2014, American Geophysical Union (AGU)

    Dr Rajkumar Hajra

  27. Relativistic electron acceleration during high-intensity, long-duration, continuousAEactivity (HILDCAA) events: Solar cycle phase dependences

    Article • Geophysical Research Letters, March 2014, American Geophysical Union (AGU)

    Dr Rajkumar Hajra

  28. Solar cycle dependence of High‐Intensity Long‐Duration Continuous AE Activity (HILDCAA) events, relativistic electron predictors?

    Article • Journal of Geophysical Research Space Physics, September 2013, American Geophysical Union (AGU)

    Dr Rajkumar Hajra

  29. Evolution of equatorial irregularities under varying electrodynamical conditions: A multitechnique case study from Indian longitude zone

    Article • Journal of Geophysical Research Atmospheres, August 2012, American Geophysical Union (AGU)

    Dr Rajkumar Hajra

  30. Ionospheric scintillation near the anomaly crest in relation to the variability of ambient ionization

    Article • Radio Science, March 2012, American Geophysical Union (AGU)

    Dr Rajkumar Hajra

  31. Equatorial ionospheric responses in relation to the occurrence of main phase of intense geomagnetic storms in the local dusk sector

    Article • Journal of Atmospheric and Solar-Terrestrial Physics, May 2011, Elsevier

    Dr Rajkumar Hajra

  32. Ionospheric effects near the magnetic equator and the anomaly crest of the Indian longitude zone during a large number of intense geomagnetic storms

    Article • Journal of Atmospheric and Solar-Terrestrial Physics, November 2010, Elsevier

    Dr Rajkumar Hajra

  33. Variability of total electron content near the crest of the equatorial anomaly during moderate geomagnetic storms

    Article • Journal of Atmospheric and Solar-Terrestrial Physics, July 2010, Elsevier

    Dr Rajkumar Hajra

  34. Electrodynamical control of the ambient ionization near the equatorial anomaly crest in the Indian zone during counter electrojet days

    Article • Radio Science, June 2009, American Geophysical Union (AGU)

    Dr Rajkumar Hajra

  35. Electrojet control of ambient ionization near the crest of the equatorial anomaly in the Indian zone

    Article • Annales Geophysicae, January 2009, Copernicus GmbH

    Dr Rajkumar Hajra

  36. Solar control of ambient ionization of the ionosphere near the crest of the equatorial anomaly in the Indian zone

    Article • Annales Geophysicae, February 2008, Copernicus GmbH

    Dr Rajkumar Hajra