Evolution and Energization of Energetic Electrons in the Inner Magnetosphere: July 2004 Storms

Details Evolution and Energization of Energetic Electrons in the Inner Magnetosphere: July 2004 Storms Evolution and Energization of Energetic Electrons in the Inner Magnetosphere: July 2004 Storms

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm23a1587f&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM23A-1587

Physics

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

Scientific paper

We examine the magnetosphere’s energetic electron responses to a series of storms that occurred in the July 16-25, 2004 period. The storms had gradually increasing magnitude, in terms of their minimum Dst of -80, -101, -148, and -197 nT. We followed the penetration and enhancements of the electrons as a function of L value using the HEO3 observations. HEO3 measures electrons of >130, >230, >450, >630, >1500 and >3000 keV and makes four traversals of the L=2-8 Re region each day. We found that the two smallest storms did not cause enhancements in the >630 keV electron fluxes for L<6.5 but did cause enhancements in the electron “source” populations at >130 and >230 keV down to L ~3.0. The two largest events caused electron enhancements at all energies from >130 keV to >3 MeV down to L ~ 2.5. For those events, were found the electron fluxes peaked in the L~3.75-4.25 range depending on their energy. We noted that the Cluster IES observations of the source populations in the pre midnight plasma sheet were quite intense with strong field aligned distributions during the early main phase of the storm on July 24. The combined results indicate that these early main phase electron fluxes at Cluster may be linked to the rapid response of hundreds of keV electrons at low L observed by HEO3 on July 24 and could have been the source for the < 1 MeV fluxes observed there.

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