The Energetic Storm Particle Event on 2003 October 24: A Test of Diffusive Shock Acceleration Theory

Details The Energetic Storm Particle Event on 2003 October 24: A Test of Diffusive Shock Acceleration Theory The Energetic Storm Particle Event on 2003 October 24: A Test of Diffusive Shock Acceleration Theory

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..781..180l&link_type=abstract

THE PHYSICS OF COLLISIONLESS SHOCKS: 4th Annual IGPP International Astrophysics Conference. AIP Conference Proceedings, Volume

Astronomy and Astrophysics

Astrophysics

1

Shock Waves, Acceleration, Interplanetary Matter, Ions, Planetary Bow Shocks, Interplanetary Shocks, Particle Acceleration

Scientific paper

A strong interplanetary shock accompanied by low-energy (<300 keV) ion intensity enhancements was observed by the ACE spacecraft at 14:48 UT on 2003 October 24. Energetic particle data collected by the EPAM instrument onboard ACE show that the time profiles of the 47-321 keV ion intensities, the ion anisotropies observed upstream and downstream of the shock, and the downstream energy spectra of the 47-321 keV ions agree with the predictions of the quasi-linear theory of diffusive shock-acceleration. This shock was also accompanied by an intense level of magnetic field fluctuations as observed during an extended (6 hours) fore-shock region by ACE/MAG. Although many of the signatures of this event are consistent with the predictions of the diffusive shock-acceleration theory acting on a low-energy particle population, analyses of the elemental abundances of heavy ions from 4He to Fe measured by ACE/ULEIS indicate that the abundances of the accelerated ions are poorly correlated with those measured in the solar wind. This result is at considerable odds with the notion that the seed population for the shock acceleration mechanism is dominated by solar wind ions. By examining the relative behavior of the heavy ion spectra, we also investigate the rigidity-dependent nature of the acceleration mechanism operating in this event.

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