Physics
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.5474s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, May 1, 1989, p. 5474-5478.
Physics
2
Interplanetary Space, Ion Distribution, Particle Acceleration, Shock Waves, Solar Wind, Anisotropy, Solar Flares
Scientific paper
The discrepancy between theory and observation is discussed with regard to the ability of interplanetary shock waves to accelerate a small percentage of the thermal ion population. The major point of departure rests with the spatial dependence of the energetic particle intensity and anisotropy in the region upstream of interplanetary shocks. It is argued that the discrepancy is due to the presence of solar flare particles forming an additional seed population which alters the upstream boundary condition of the energetic population. The resulting anisotropy of the energetic particle distribution several scale lengths upstream of the shock is proportional to the ratio of the streaming of the shock-accelerated population to the density of the solar flare population. This theory is then compared with the results of observed upstream anisotropy and measured particle intensities and anisotropies.
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