On the Velocity Dispersion in Solar Impulsive Electron Events

Details On the Velocity Dispersion in Solar Impulsive Electron Events On the Velocity Dispersion in Solar Impulsive Electron Events

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh31c..08k&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH31C-08

Physics

7514 Energetic Particles (2114), 7534 Radio Emissions, 7871 Waves And Instabilities

Scientific paper

A statistical survey of 26 solar impulsive electron events in the 1 to 300 keV range is presented, as observed by the 3D Plasma and Energetic Particle experiment on the Wind spacecraft. This study was triggered by results of ACE/EPAM observations (Roelof et al.) reporting the absence of velocity dispersion in solar impulsive electrons events in the energy range of 40-300~keV. Here we find that the majority of events show clear velocity dispersion. Events with high peak flux had to be first corrected for spurious counts of electrons depositing only a fraction of their energy before they are scattered out of the detector. Without this correction the onset times wrongly appeared to be almost without velocity dispersion. For the large events, the reduced distribution functions show positive slopes at high energies (around 100 keV). The calculated linear growth rates are large, but no in-situ waves are observed by the WIND/WAVES instrument.

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