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The effects of geomagnetic storms on electrons in Earth\textquoterights radiation belts


AuthorTurner, D.; O\textquoterightBrien, T.; Fennell, J.; Claudepierre, S.; Blake, J.; Kilpua, E.; Hietala, H.;
Keywordselectrons; Van Allen Probes; Geomagnetic storms; Radiation belts
AbstractWe use Van Allen Probes data to investigate the responses of 10s of keV to 2 MeV electrons throughout a broad range of the radiation belts (2.5 <= L <= 6.0) during 52 geomagnetic storms from the most recent solar maximum. Electron storm-time responses are highly dependent on both electron energy and L-shell. 10s of keV electrons typically have peak fluxes in the inner belt or near-Earth plasma sheet and fill the inner magnetosphere during storm main phases. ~100 to ~600 keV electrons are enhanced in up to 87\% of cases around L~3.7, and their peak flux location moves to lower L-shells during storm recovery phases. Relativistic electrons (>=~1 MeV) are nearly equally likely to produce enhancement, depletion, and no-change events in the outer belt. We also show that the L-shell of peak flux correlates to storm magnitude only for 100s of keV electrons.
Year of Publication2015
JournalGeophysical Research Letters
Volume
Number of Pages
Section
Date Published07/2015
ISBN
URLhttp://doi.wiley.com/10.1002/2015GL064747
DOI10.1002/2015GL064747