The Effect of a Random Magnetic Field on SEP Event Onset Times

Details The Effect of a Random Magnetic Field on SEP Event Onset Times The Effect of a Random Magnetic Field on SEP Event Onset Times

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh53a1478p&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH53A-1478

Physics

0669 Scattering And Diffraction, 2164 Solar Wind Plasma, 7524 Magnetic Fields

Scientific paper

We discuss the physics of solar-energetic particle transport in the inner heliosphere. We focus on the time delay between the particles' injection at the Sun and their observation at 1AU. If the particles are injected impulsively, the onset times versus c/v for all observed energies can be used to obtain the injection time of the solar energetic particle (SEP) events where c is the speed of light and v is the speed of particle. If we know the path length s traveled by the particles, we can determine the release time of particles. In previous work, s is taken to be the nominal value of Parker spiral field (≍ 1.2AU when solar wind speed is around 400 km/s) . The inferred injection times by this method usually show an approximate 10 minutes delay after the associated type III radio burst, which is not yet fully understood. In this paper we consider the effect of a random magnetic field on onset-time analysis. We present the results of numerical simulations and find that the path length is generally significantly different from 1.2 AU for a given SEP event. This is due to the random nature of the interplanetary magnetic field. Implications for our understanding of SEP events are discussed.

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