Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....6.3499c&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
Scientific paper
The transport of energetic particles perpendicular to the mean magnetic field in space plasmas long has been viewed as a diffusive process. However, there is an apparent conflict between recent observations of solar energetic particles (SEP): 1) SEP from impulsive solar flares can exhibit "drop outs" in which the intensity near Earth repeatedly disapp ears and reapp ears. This indicates that the distribution of SEP in space is highly filamentary, with very little lateral diffusion across these boundaries. 2) Observations by the IMP-8 and Ulysses spacecraft, while they were on opposite sides of the Sun, showed similar timeintensity profiles for many SEP events. This indicates that particles often undergo rapid lateral diffusion. We explain these seemingly contradictory observations using a theoretical model, supported by computer simulations, in which many particles are temporarily trapped within top ological structures in statistically homogeneous turbulence, and ultimately escape to diffuse at a much faster rate.
Chuychai Piyanate
Matthaeus William H.
Ruffolo David
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