How are storm-time injections different from nonstorm-time injections?

Details How are storm-time injections different from nonstorm-time injections? How are storm-time injections different from nonstorm-time injections?

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm71a0575l&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM71A-0575

Physics

2720 Energetic Particles, Trapped, 2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2778 Ring Current, 2788 Storms And Substorms

Scientific paper

One of the key elements of storms and substorms is the injection of energetic particles into the region of near geosynchronous orbit, that is, the sudden flux enhancement in the energy range of tens to hundreds of keV. This paper reports the observational results on how such injection features are different during storm times compared to nonstorm times. We particularly focus on the difference between proton injections and electron injections during storm times. Based on a number of storm time injection events that meet our strict selection criteria, a notable difference is found between proton injections and electron injections in the spectral dependence of the flux enhancement averaged over the first 30 min after the injection onset: The average flux enhancement of protons tends to be bigger at higher energy channels than at lower energy channels, but electron injections exhibit opposite behavior for the energy-spectral dependence of flux enhancement, i.e., flux enhancement decreasing with energy. We show that this feature is almost unique only for the injection events during the storm main and early recovery phase. It is suggested that any successful acceleration mechanism intended to model storm time injections should be able to explain this difference between proton injections and electron injections.

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