Stormtime Energetic Electron Responses for L≤4

Details Stormtime Energetic Electron Responses for L≤4 Stormtime Energetic Electron Responses for L≤4

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm33c1909f&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM33C-1909

Physics

[2720] Magnetospheric Physics / Energetic Particles: Trapped, [2730] Magnetospheric Physics / Magnetosphere: Inner, [2774] Magnetospheric Physics / Radiation Belts

Scientific paper

Using HEO data we have examined the electron responses to magnetic storms that occurred during 1998 to 2008 deep in the inner magnetosphere. We examined the response to all storms with Dst minimum less than -70 nT. The electron energy ranges examined were >230 keV, >600 keV, >1.5 MeV and > 3 MeV at low L values (2 < L < 4.5). We determined whether the post storm electron fluxes increased, decreased, or remained unchanged relative to the prestorm levels for these energies at multiple L values. We also determined the time from Dst minimum to peak flux for the electron enhancements for the different L values. The results show that there was a Dst dependence of the occurrence of post storm electron flux enhancements that was also energy dependent and strongest at the smaller L values. For example, at L=2.5 the >3 MeV fluxes rose ~3% of the time for storms with Dst >-100 nT and ~86% of the time for storms with Dst <-200 nT. The corresponding statistics for >230 keV electrons was ~39% and 100% respectively. The time to post storm flux maxima was observed to be energy dependent. For example, at L=3 the time to flux maximum increased with increasing energy ranging from a mean of 0.89 days for >230 keV electrons to 3.3 days for >1.5 MeV electrons. We will show and discuss the results for all the L values examined.

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