Energetic Electrons Associated with Transient Interplanetary Shocks: Evidence for Weak Interaction

Details Energetic Electrons Associated with Transient Interplanetary Shocks: Evidence for Weak Interaction Energetic Electrons Associated with Transient Interplanetary Shocks: Evidence for Weak Interaction

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....6.3689h&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

3

Scientific paper

Energetic Storm Particle (ESP) events are increases of energetic charged particle intensities observed upstream and downstream of interplanetary (IP) shocks. The solar wind plasma and magnetic field instruments on the ACE spacecraft have detected over 160 transient IP shocks during the period September 1997 to December 2001. More than a half of these shocks produced ESP signatures in the intensities of >47 keV ions, as measured by the EPAM instrument on ACE. However, only relatively few events (28) produced ESP signatures for >38 keV electrons. We studied the spectral indices of both ions and electrons in these electron ESP events and compared them to the steady-state diffusive shock-acceleration prediction based on the shock strength. We found that the ma jority of the measured events do not follow the prediction. In addition, both ion and electron spectra soften at the shock in the ACE data set, in agreement with a weak (single-interaction) shock drift acceleration. We therefore conclude that the shock interactions for >38 keV electrons and >47 keV ions at 1 AU are weak, and consequently that the strong interaction (i.e., multiple shock crossings) description is usually not applicable to ESP shock events.

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