Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm24a..08f&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM24A-08
Physics
Plasma Physics
[2774] Magnetospheric Physics / Radiation Belts, [2788] Magnetospheric Physics / Magnetic Storms And Substorms, [7807] Space Plasma Physics / Charged Particle Motion And Acceleration, [7867] Space Plasma Physics / Wave/Particle Interactions
Scientific paper
Relativistic electron flux in the outer radiation belt varies dramatically during magnetic storms. The flux intensity often exhibits a main-phase dropout, followed by a fast recovery and then gradual enhancement. Low-energy electrons from the plasma sheet are injected into the outer belt by the strong convection during the storm main phase. They reach ring-current energy in the course of earthward transport and become the seed population of wave-particle interactions. It is commonly believed that electron energy diffusion by the whistler mode chorus waves is the main process to account for the relativistic electron flux enhancement during the storm recovery. Using a global kinetic model we simulate ring current and radiation belt electron variations during super storms, large and moderate storms. We find in most cases that including diffusion with whistler mode chorus waves results in higher MeV-electron flux in the outer belt. However, in the case of a super storm, the electron flux is lower when chorus wave diffusion is considered. We will discuss why there is different response of energetic electrons to whistler mode chorus waves during super storms.
Albert Jay M.
Fok M. H.
Glocer A.
Zheng Quan-shui
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