Storm-time Injection of Plasma Sheet Electrons into the Radiation Belt During the March~31, 2001 Geomagnetic StormOuter

Details Storm-time Injection of Plasma Sheet Electrons into the Radiation Belt During the March~31, 2001 Geomagnetic StormOuter Storm-time Injection of Plasma Sheet Electrons into the Radiation Belt During the March~31, 2001 Geomagnetic StormOuter

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm52a..01e&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM52A-01

Physics

2720 Energetic Particles, Trapped, 2730 Magnetosphere: Inner, 2760 Plasma Convection, 2764 Plasma Sheet, 2788 Storms And Substorms

Scientific paper

A fundamental problem in understanding the physics of the outer radiation belts is the very origin of the energetic particles comprising them [Li et al., GRL~24, 923, 1997]. Several sources have been suggested, e.g., injection of particles from the cusp [Sheldon et al., GRL 25, 1825, 1998], local heating of inner magnetospheric plasmas [e.g. Summers & Ma, JGR 105, 15887, 2000], or through the transport of plasma sheet particles into the stable trapping region of the inner magnetosphere via convective or substorm injection. In general, the latter may occur when time-varying electric and magnetic fields alter the position of the Alfvén layer, the energy- and field-dependent separatrix between those particles whose gradient-curvature drift keeps them on closed orbits within the magnetosphere, and those particles whose drift paths intersect the magnetopause. In this work, we use global MHD simulations of the March~31, 2001 magnetic storm to investigate the transport of energetic (keV) electrons from the plasma sheet into the stable trapping region. We examine trapping efficiency both under the influence of strong, time-varying magnetospheric convection, such as characterized the main phase of this storm, as well as during periods of substantial magnetotail reconfiguration, such as may be associated with the dramatic 0630 substorm observed during this event.

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