Simulations of Trapped Energetic Ions in the Inner Magnetosphere

Details Simulations of Trapped Energetic Ions in the Inner Magnetosphere Simulations of Trapped Energetic Ions in the Inner Magnetosphere

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm51a1338r&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM51A-1338

Physics

Plasma Physics

[2716] Magnetospheric Physics / Energetic Particles: Precipitating, [2720] Magnetospheric Physics / Energetic Particles: Trapped, [2788] Magnetospheric Physics / Magnetic Storms And Substorms, [7845] Space Plasma Physics / Particle Acceleration

Scientific paper

Energetic ions from interplanetary space can contribute significantly to the particle population of the inner magnetosphere during magnetic storms. Simulation studies have shown that non-adiabatic acceleration processes, acceleration by the cross tail electric field and the effect of compression of the magnetic field due to changes in the solar wind dynamic pressure can all affect the entry of these particles into the inner magnetosphere and their loss. This study uses a combination of MHD simulations driven by the solar wind and interplanetary magnetic field (IMF) upstream of the magnetosphere and particle tracing calculations in the time dependent electric and magnetic fields from the MHD simulations to investigate the trapping and loss of ions in the inner magnetosphere. We show that the simulation can reproduce storm time observations of energetic ions at synchronous orbit and investigate whether the behavior of trapped particles in the MHD simulation resembles a diffusive process in the time varying local magnetic and electric fields.

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