The Energization of Ions in the Inner Magnetosphere by Sudden Storm Commencement

Details The Energization of Ions in the Inner Magnetosphere by Sudden Storm Commencement The Energization of Ions in the Inner Magnetosphere by Sudden Storm Commencement

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm11a1567p&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM11A-1567

Physics

2744 Magnetotail, 2760 Plasma Convection (2463), 2764 Plasma Sheet, 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

We have investigated the impact of coronal mass ejection (CME)-caused sudden storm commencements (SSCs) on magnetospheric ion populations by using a combination of global magnetohydrodynamic (MHD) simulations and large-scale kinetic particle tracing calculations. To do so, we have selected three moderate to large CME-driven geomagnetic storms for which upstream solar wind and interplanetary magnetic field (IMF) data and observations in the magnetotail and near-Earth plasma sheet are available. For each event, we have run a global MHD simulation of the event using upstream solar wind and IMF data. Ion trajectories are then traced from the solar wind, upstream of the bow shock, and from the ionosphere beginning 3-4 hours prior to the SSC to obtain global distributions of ions in the magnetotail and inner magnetosphere just prior to, during, and immediately after the SSC. Of particular interest is the energization evident in ion velocity distribution functions, and the dependence of this energization on distance from Earth and on local time. We further ascertain the effect of the shock impact on the acceleration and transport of ions in the seed region of the ion radiation belts, and determine the differences, if any, in the energization of protons and heavy ions in the inner magnetosphere.

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