Solar Energetic Particle Contribution to the Particle Population at Geosynchronous Orbit

Details Solar Energetic Particle Contribution to the Particle Population at Geosynchronous Orbit Solar Energetic Particle Contribution to the Particle Population at Geosynchronous Orbit

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm23c..04r&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM23C-04

Physics

2716 Energetic Particles: Precipitating, 2720 Energetic Particles: Trapped, 2753 Numerical Modeling, 2774 Radiation Belts

Scientific paper

To understand the formation of radiation belts it is important to assess the contributions of different upstream particle populations. Different sources can contribute to the energetic trapped particle population at geosyncronous orbit: Solar energetic particle (SEP) ions with energies above typical ring current energies (100 keV), lower energy SEPs below 100 keV that are accelerated to higher energies, and strongly accelerated solar wind particles. To study the entry and acceleration processes of SEPs we performed particle tracing calculations in the electric and magnetic fields from global magnetohydrodynamic (MHD) simulations of selected intervals. The weight of these particles in contributing to the observed particle flux is determined by using the flux observed by spacecraft in the solar wind. These calculations will be supplemented by trajectory calculations of lower energy particles to determine the dominant sources and acceleration models of energetic particles observed by geosynchronous spacecraft.

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