Sources of Cusp Energetic Ions

Details Sources of Cusp Energetic Ions Sources of Cusp Energetic Ions

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm62a0500c&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM62A-0500

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2154 Planetary Bow Shocks, 2451 Particle Acceleration, 2716 Energetic Particles, Precipitating, 2720 Energetic Particles, Trapped

Scientific paper

Cusp Energetic particles (CEPs) observed by the Polar spacecraft provide new insight into the particle acceleration and transport processes within the geospace. Three sources have been proposed: bow shock diffuse ions, shocked solar wind ions locally accelerated in the cusp, and energetic particles injected from the magnetotail. The bow shock model suggests that solar wind ions undergo first order Fermi acceleration at the quasi-parallel bow shock and are subsequently transported into the cusp. Therefore, it is expected to see CEPs controlled by upstream parameters. The tail injection model predicts CEPs are closely associated with the substorm activity. We perform a statistical study of CEP events identified in the Polar data for a number of parameters (IMF components, shock geometry, solar wind velocity, Mach number, AE index) to determine the relative contributions from the bow shock and magnetotail. Because the mechanism for the local acceleration remains unknown, features unique to this model but not the other two models are difficult to identify. Thus those CEP events that cannot be explained by the bow shock and magnetotail injection models provide the upper limit for CEP events of local acceleration. Preliminary results of the statistical study will be presented. Other possible sources for CEPs will also be discussed.

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