Energetic Particle Acceleration at Near-Earth by Interplanetary Shocks

Details Energetic Particle Acceleration at Near-Earth by Interplanetary Shocks Energetic Particle Acceleration at Near-Earth by Interplanetary Shocks

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh12a..07h&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH12A-07

Physics

7807 Charged Particle Motion And Acceleration, 7851 Shock Waves, 2114 Energetic Particles, Heliospheric (7514), 2139 Interplanetary Shocks

Scientific paper

Interplanetary (IP) shocks provide an excellent opportunity to study energetic particle acceleration. During an IP shock related energetic storm particle (ESP) event, both the shock and the accelerated particles can be measured in-situ simultaneously. Thus, a study of in-situ IP shocks and particle distributions in their vicinity provides a meaningful way to test our theoretical understanding of shock acceleration. In addition, with simultaneous multi-point measurements (such as ACE and Wind), we have for the first time enough data to construct a global picture of IP shock propagation and acceleration from L1 to the Earth. During the current solar cycle, advanced particle instruments on board both the ACE and Wind spacecraft have detected numerous ESP events and therefore provided us with an ideal dataset to study IP shock acceleration in unprecedented detail. In this paper, we will combine simultaneous measurements of ACE/EPAM, ACE/ULEIS, and Wind/STEP during several ESP events and examine the spatial and temporal variations of these events in the Earth's vicinity. We will also investigate the ion composition and energy spectra for some of these events and investigate their relationship with the locally measured properties of the IP shocks.

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