GEOPHYSICAL AND STATISTICAL ANALYSIS OF SOLAR WIND AND GEOMAGNETIC CONDITIONS DURING FAST-ESR ION-UPWELLING CONJUNCTIONS
DOI:
https://doi.org/10.60787/jnamp.vol73no.724Keywords:
ionosphere, ion upflow, geophysical conditions magnetosphereAbstract
This study examines how solar wind and geomagnetic conditions drive heavy-ion outflow from the topside ionosphere, which influences atmospheric loss and magnetospheric dynamics. Using FAST satellite and EISCAT Svalbard Radar data during seven magnetic conjunction events with previously identified ion upwelling, the authors analyzed OMNI solar wind data and geomagnetic indices. Two representative events are highlighted: a nightside conjunction on 2002-01-20 during a substorm expansion phase with strongly southward IMF and AL exceeding -350 nT, and a dayside conjunction on 2006-03-18 during a corotating interaction region featuring variable solar wind and a two-step southward Bz turning. Across all events, 2006-03-18 showed the greatest solar wind variability and strongest dayside reconnection coupling, while 2005-09-12 exhibited the most solar wind–magnetosphere energy transfer in the sample. The findings are consistent with the established view that southward IMF and enhanced dynamic pressure promote ion energisation via reconnection-driven Joule heating and electron precipitation.
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