The effects of geomagnetic storms on electrons in Earth's radiation belts

TitleThe effects of geomagnetic storms on electrons in Earth's radiation belts
Publication TypeJournal Article
Year of Publication2015
AuthorsTurner, DL, O'Brien, TP, Fennell, JF, Claudepierre, SG, Blake, JB, Kilpua, E, Hietala, H
JournalGeophysical Research Letters
Date Published07/2015
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.
URLhttp://doi.wiley.com/10.1002/2015GL064747
DOI10.1002/2015GL064747
Short TitleGeophys. Res. Lett.


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