Diffusive vs. impulsive energetic electron transport during radiation belt storms

Details Diffusive vs. impulsive energetic electron transport during radiation belt storms Diffusive vs. impulsive energetic electron transport during radiation belt storms

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm33a1749v&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM33A-1749

Other

2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2774 Radiation Belts, 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

Earth's electron radiation belts are continually replenished by inward particle transport (as well as other, local acceleration processes) taking place during radiation belt storms. For some storms the radial transport is primarily diffusive while for others it is impulsive, or characterized by injections. To distinguish between these types of inward transport, we first use a dynamic model of the phase-space density as measured by POLAR/HIST and expressed in terms of adiabatic invariants [Green and Kivelson, 2004]. In a review of storms from 1997 to 2004 the coefficients of the model are peaked at characteristic temporal and phase- space (mu, k, L*) scales during specific storms. The transport is quantified in terms of those invariants which are violated and identified with peaks of the electron distribution in invariant space. Second, we run guiding- center simulations in wave fields fitted to in situ measurements complemented at low and high L by ground ULF pulsations. The modes of response identified in earlier studies from SAMPEX and POLAR electron flux measurements are now associated with primarily diffusive transport in the central range of the outer belt, L=4-8, and primarily impulsive transport near the plasmapause boundary, L=3-4.

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