Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm42a..04e&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM42A-04
Other
7807 Charged Particle Motion And Acceleration, 7827 Kinetic And Mhd Theory, 7845 Particle Acceleration, 7954 Magnetic Storms (2788), 7984 Space Radiation Environment
Scientific paper
Energetic particle fluxes in the inner magnetosphere vary as a result of a complex balance between transport, acceleration, and loss. A critical aspect in quantifying these variations is appropriate specification of boundary conditions. keV particles in the tail, outside the region of stably trapped particles closer to Earth, may be injected into the inner magnetosphere as a result of substorms and other variations in the large-scale convective motion of the magnetosphere. These injected particles may serve as a seed population for subsequent acceleration to relativistic energies. Conversely, during periods where the phase space density in the inner magnetosphere exceeds that in the tail, energetic particles may be lost from the inner magnetosphere through the stable trapping boundary. In this effort we use global simulations of the January 28, 1995 geomagnetic storm to track the evolving phases space density of energetic electrons in the inner magnetosphere and tail over the course of the event. This storm occurred in the declining phase of the last solar cycle and was a moderate storm as characterized by the Dst index, driven by extended periods of high speed solar wind (>700 km/s). Energetic particle access to the inner magnetosphere will be examined as a function of driving conditions and energy, and the effect of diffusive losses from the belts investigated for those periods and particle populations when access is restricted. Using phase space density calculations of both trapped and plasmasheet populations, we attempt to quantitatively determine the effects of boundary conditions on the evolution of the radiation belts during this storm.
Chan Anthony A.
Elkington Scot R.
Yue Bin
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