Understanding tansport of electrons in electron/He3 rich events using a direct Monte-Carlo approach

Details Understanding tansport of electrons in electron/He3 rich events using a direct Monte-Carlo approach Understanding tansport of electrons in electron/He3 rich events using a direct Monte-Carlo approach

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh53b..06r&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH53B-06

Physics

7519 Flares, 7859 Transport Processes

Scientific paper

Impulsive solar energetic particle (SEP) events are characterized by a high e/p ratio and over-abundance of He3. To decipher the underlying acceleration process of these events, it is crucial to deduce precisely the injection time of electrons and ions from the observed time intensity profiles at 1 AU. In a collisionless plasma like the solar wind, the propagation of electrons and ions follows the Parker spiral magnetic field lines, subject to pitch angle scattering due to the presence of solar wind magnetic turbulence. The effect of the pitch angle scattering is to alter particle pitch angles in a random manner during their propagation, leading to a prolonged propagation time and a less-focused pitch angle distribution. In this work, we study the transport of electrons in impulsive SEP events. The pitch angle scattering is investigated using a direct Monte-Carlo technique where the underlying Fokker-Planck transport equation is solved by casting it to a set of equations describing single particle's motion. By following the trajectories of individual particles, the time intensity profiles and pitch angle distributions at 1 AU are obtained. We discuss the comparison of our simulation results to observations by WIND/3DP and its implications on the interplanetary turbulence spectrum.

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