Trapping of Solar Energetic Particles by Small-Scale Topology of Solar Wind Turbulence

Details Trapping of Solar Energetic Particles by Small-Scale Topology of Solar Wind Turbulence Trapping of Solar Energetic Particles by Small-Scale Topology of Solar Wind Turbulence

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsh24a..05r&link_type=abstract

American Geophysical Union, Spring Meeting 2004, abstract #SH24A-05

Mathematics

Logic

2118 Energetic Particles, Solar, 2134 Interplanetary Magnetic Fields, 7807 Charged Particle Motion And Acceleration, 7859 Transport Processes, 7863 Turbulence

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) impulsive solar flares can exhibit ``dropouts" in which SEP intensity near Earth repeatedly disappears and reappears, indicating a filamentary distribution of SEPs and little diffusion across these boundaries. 2) Observations by the IMP-8 and Ulysses spacecraft, while they were on opposite sides of the Sun, showed similar time-intensity profiles for many SEP events, indicating rapid lateral diffusion of particles throughout the inner solar system within a few days. We explain these seemingly contradictory observations using a theoretical model, supported by computer simulations, in which many particles are temporarily trapped within topological structures in statistically homogeneous magnetic turbulence, and ultimately escape to diffuse at a much faster rate. This work was supported by the Thailand Research Fund, the Rachadapisek Sompoj Fund of Chulalongkorn University, and the NASA Sun-Earth Connections Theory Program (grant NAG5-8134).

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