Energetic Storm Particle Events Observed on ACE from September 1997 to December 2000

Details Energetic Storm Particle Events Observed on ACE from September 1997 to December 2000 Energetic Storm Particle Events Observed on ACE from September 1997 to December 2000

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh12c..08h&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH12C-08

Physics

7807 Charged Particle Motion And Acceleration, 7851 Shock Waves

Scientific paper

Energetic Storm Particle (ESP) events are increases of energetic charged particle intensities that are observed upstream and downstream of interplanetary (IP) shocks. ESP events are observed most commonly in ion intensities and have time scales ~hours. The solar wind plasma and magnetic field instruments on the ACE spacecraft (at the L1 Lagrangian point ~230 Re upstream of the Earth) have detected over 200 IP shocks during the period September 1997 to December 2000. More than half of these shocks produced ESP signatures in the intensities of ions >47 keV and electrons >38 keV, as measured by the Electron Proton and Alpha Monitor (EPAM) instrument on ACE. Most of the observed ion ESP signatures fall within three classes: 1) gradual, monotonic intensity increases and decreases before and after the shock; 2) spike-like intensity increases around the shock; 3) step-like intensity increases across the shock. Typical intensity enhancements of ions 47-65 keV range from ~1 to 100. While intensity enhancements of electrons 38-53 keV were also observed at some of these shocks, such enhancements varied only from ~1 to 30. There is no apparent correlation between the intensity enhancement factor of the ions and electrons. That is, large enhancements of ion intensities do not always correspond to large enhancements of the electron intensities. In this paper we investigate the solar-cycle dependence of these ESP events, and use ACE/EPAM data to examine the ion energy spectra and angular distributions observed for some of these events.

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