Evolution of Electron Phase Space Density Between and During Geomagnetic Storms: SCATHA Observations

Details Evolution of Electron Phase Space Density Between and During Geomagnetic Storms: SCATHA Observations Evolution of Electron Phase Space Density Between and During Geomagnetic Storms: SCATHA Observations

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm33a1744r&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM33A-1744

Physics

2483 Wave/Particle Interactions (7867), 2720 Energetic Particles: Trapped, 2774 Radiation Belts, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

Radial profiles of the energetic electron phase space density measured by the SCATHA satellite during the recovery phase of the storm an May 6-7, 1986 exhibited a locally-growing peak at L ~ 6. The peak occurred for large values of the second invariant K, but not for small K. A possible interpretation of this feature is as a signature of localized pitch angle diffusion by waves. As the storm recovery phase evolved, the peak gradually shifted to higher L. One may speculate that this behavior is due to the natural expansion of the plasmapause, which causes the conditions necessary for the causative plasma waves to also shift outward in L. This electron phase space density analysis has now been extended to several more storms and non-storm intervals. The radial profiles of electron phase space density are compared with similar profiles of wave intensity measured by SCATHA. Depending on the local time coverage of the SCATHA orbit, the wave emissions may or may not be accessible by the satellite. For a subset of the events, both phase space density peaks and wave emissions are simultaneously observed, enabling a detailed examination of the effects of waves on the particles. The results are compared with models of electron losses by quasilinear pitch angle diffusion.

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