Resonnant Drift Interaction Between Radiation Belt Electrons and ULF Waves of high Azimuthal Order

Details Resonnant Drift Interaction Between Radiation Belt Electrons and ULF Waves of high Azimuthal Order Resonnant Drift Interaction Between Radiation Belt Electrons and ULF Waves of high Azimuthal Order

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm41c..04s&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM41C-04

Physics

2483 Wave/Particle Interactions (7867), 2716 Energetic Particles: Precipitating, 2730 Magnetosphere: Inner, 2774 Radiation Belts, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

The low-altitude radiation belt at L<3.3, inside the plasmasphere, often shows multiple peaked electron energy spectra with up to 12 maxima between 0.4 and 2.5 MeV. These structures, dispersed with latitude, appear mainly during magnetic storms main phases inside the plasmasphere and down to L value as low as 1.1. As these structures are repeatedly measured onboard the Demeter satellite during a four year period, we conclude they are a characteristic of the low altitude radiation belts and are linked to storm associated changes in the magnetic fields. After eliminating a cyclotron resonnance cause, we examine the possibility that these structures are due to the interaction of drifting electron with ULF waves (T> 45 secondes) with high azimuthal orders. Numerical simulations of these interactions are performed and are shown to be in general agreement with the meassured structure and evolution of the peaked structures.

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