HR: 09:00h
AN: SA41B-05    [Abstracts]
TI: Formation of the new radiation belt during October-November storms 2003
AU: Horne, R
EM: r.horne@bas.ac.uk
AF: British Antarctic Survey,, Natural Environment Research Council, High Cross, Madingley Road , Cambridge, CB3 0ET United Kingdom AU: * Shprits, Y Y
EM: yshprits@atmos.ucla.edu
AF: University of California, Los Angeles Department of Atmospheric and Oceanic Sciences , 405 Hilgard Ave Box 951565 7127 Math Sciences Bldg. , Los Angeles, CA 90095-1565 United States AU: Thorne, R M
EM: rmt@atmos.ucla.edu
AF: University of California, Los Angeles Department of Atmospheric and Oceanic Sciences , 405 Hilgard Ave Box 951565 7127 Math Sciences Bldg. , Los Angeles, CA 90095-1565 United States AB: Stochastic acceleration and loss of MeV electrons during October-November storms 2003 is required to explain the rapid loss and the formation of a new radiation belt in the "slot " region, near L=3. The compression of plasmasphere during the main phase of the storm down to L=2.2 creates preferential conditions for local acceleration. Filling of the slot region of the radiation belts is modeled with a 2D pitch-angle, energy diffusion code. We find that the pitch angle distributions rapidly attain equilibrium shapes. Energy dependent lifetimes are on the scale of a day for MeV electrons and on the scale of a few hours for 10-100 keV electron population, which provides a source for chorus emissions. We show that the energy diffusion driven by whistler mode waves is capable of accelerating electrons up to energies of 3 MeV on the time scales of few days which is consistent with HEO and SAMPAX observations.
DE: 7867 Wave/particle interactions
DE: 2716 Energetic particles, precipitating
DE: 2720 Energetic particles, trapped
DE: 2753 Numerical modeling
DE: 2768 Plasmasphere
SC: SPA-Aeronomy [SA]
MN: 2004 AGU Fall Meeting