Properties and Possible Causes of Low Latitude Broadband Accelerated Electron Events During Large Storms From FAST and Altitude Dependence of PSBL Alfven Waves From Polar

Details Properties and Possible Causes of Low Latitude Broadband Accelerated Electron Events During Large Storms From FAST and Altitude Dependence of PSBL Alfven Waves From Polar Properties and Possible Causes of Low Latitude Broadband Accelerated Electron Events During Large Storms From FAST and Altitude Dependence of PSBL Alfven Waves From Polar

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm21a0326d&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM21A-0326

Physics

2716 Energetic Particles: Precipitating, 2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions (2431), 2788 Magnetic Storms And Substorms (7954), 7954 Magnetic Storms (2788)

Scientific paper

A variety of phenomena which occur during large geomagnetic storms (DST<-75 nT) are not yet fully understood. One such phenomenon, which affects ionospheric conditions and may be useful as a diagnostic for processes occurring at ~3-6 Re, is the occurrence of low latitude (ILat<65) broadband accelerated electron events observable at altitudes of ~2000-4000 km by the FAST satellite. Results of an initial study of 3+ years of FAST data indicate that such electrons are observed in ~6% of the low latitude, nightside (21- 03 MLT) FAST data during large storms versus <~1% during non-storm times. Individual storms have observed occurrence probabilities as high as 24%. Although properties of the events, and thus likely causes, vary, many events are accompanied by particle distributions and wave signatures that are similar to those observed during Alfvén-wave accelerated electron events on the plasma sheet boundary layer (PSBL). Alfvén- wave acceleration of electrons on the PSBL has been and continues to be well studied. Results of a recent study of PSBL Alfvén-wave events observed with Polar that may provide additional insight will also be discussed. That study compares altitude dependencies of wave properties at ~3-9 Re and differences in these dependencies between major storm and non-storm events.

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