Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm33a1759t&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM33A-1759
Physics
2720 Energetic Particles: Trapped, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2774 Radiation Belts, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
Understanding the drift-resonant interaction between relativistic electrons and ULF waves is a key to understand the acceleration of outer belt electrons. The September 25, 2001 storm sudden commencement (SSC) event presents us a good opportunity to study the effect of ULF waves on relativistic electron dynamics. We analyzed data from the constellation of 14 satellites, ranged among ACE and WIND satellites monitoring upstream solar wind condition, CLUSTER satellites measuring ULF wave and energetic electron flux, LANL and GOES satellites determining relativistic electron distribution around geosynchronous orbit, and NOAA POES satellite detecting radial diffusion of > 300 keV electron flux. We found that there exists a threshold in electron energy, above which the anomalous energization of electrons as described by Degeling et al. (2007) (Planetary and Space Science, 55(2007) 731-742) occurred. At lower energies we see the substorm injection on night side and the electron flux modulation by the local azimuthal electric field (Ephi) of ULF waves on dayside. In contrast, the drift dispersion signature and large enhancement of electron flux are more evident above the threshold. Our observed signatures of compressional waves (for instance, Ephi frequency is nearly independent of L, Ephi amplitude decreases with L, and the phase shift between Bz and Ephi changes from pi/2 to 0 as L increases) are qualitatively consistent with the ULF wave model in Degeling et al. (2007). In addition, the back-tracing of energetic electrons also suggested the disappearance of Ephi on the night side. Therefore, our observational evidences indicate the profound effect of azimuthal localization in wave amplitudes on the electron dynamics as suggested by Degeling et al. (2007).
Shao Xiaofeng
Tan Lei
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