Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm43b..03k&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM43B-03
Physics
7845 Particle Acceleration, 2144 Interstellar Gas, 2720 Energetic Particles: Trapped, 2774 Radiation Belts
Scientific paper
Prior to 2003, there are two known cases where ultra-relativistic (>10 MeV) radiation belt electrons were injected into the inner zone in association with high speed interplanetary shocks: the 24 March 1991 and the less well studied 21 February 1994 storms. During the March '91 event electrons were injected well into the inner zone on a timescale of minutes producing a new stably trapped radiation belt population that persisted for ~10 years following this event. More recently, at the end of solar cycle no. 23, a number of violent geomagnetic disturbances, including the 29 Oct 2003 (Halloween) storm, resulted in the injection of and dramatic variations in ultra-relativistic electrons in the inner zone, indicating that these events are less rare than previously thought. Here we present a numerical study of shock induced injection and adiabatic heating resulting in a 10-20 MeV inner zone electron population. Test particle trajectories are followed in 3D fields from an MHD magnetospheric model simulation of the 29 Oct 2003 Storm Sudden Commencement (SSC), driven by solar wind parameters. Lorentz and guiding center trajectories are used to follow two possible source populations: the observed isotropic solar energetic electron distribution, and the pre-SSC trapped outer zone distribution. MHD Magnetospheric model and radiation belt simulations are performed using code developed by The Center for Intergrated Space Weather Modeling (CISM).
Goodrich Charles Carson
Hudson Mary K.
Kress Brian T.
Looper Mark Dixon
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