Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm23a1596c&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM23A-1596
Physics
[2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2774] Magnetospheric Physics / Radiation Belts
Scientific paper
During some geomagnetic storms the flux of relativistic electrons at geosynchronous altitudes increases by more than two orders of magnitude. Recent research suggests a connection between occurrences of relativistic electrons and enhanced wave power in the Ultra Low Frequency (ULF) band. Two competing models have been published in the literature explaining processes by which electrons are accelerated by ULF waves. We present a statistical study of the nature of ULF pulsations associated with the occurrence of relativistic electrons using data from High Frequency (HF) radars and ground-based magnetometers. Our analysis suggests that local, non-resonant waves, and not global, FLR-like pulsations seem to be the preferred mechanism of electron acceleration to relativistic energies.
Baker Joseph B.
Clausen B. L.
Ruohoniemi Michael J.
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