Physics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9615853b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Sept. 1, 1991, p. 15,853-15,862.
Physics
8
Interplanetary Medium, Magnetic Field Configurations, Normal Shock Waves, Oblique Shock Waves, Particle Acceleration, Computerized Simulation, International Sun Earth Explorer 3, Interplanetary Magnetic Fields, Proton Energy
Scientific paper
The present study investigates the acceleration of low-energy protons by quasi-perpendicular shocks. The pitch angle distribution of ions in the energy range of 35 keV to 1 MeV is determined across the interplanetary shock that passed through the ISEE 3 spacecraft on November 30, 1979. A bidirectional angular distribution is observed upstream of the shock. It is suggested that multiple crossings of the field line with the surface of the shock, forming a 'magnetic bottle', accounts for such an unusual angular distribution. The shock event is modeled by integrating particle trajectories numerically. A detailed numerical study of particle acceleration shows that in the bottle topology, the particle flux is enhanced close to the shock front, contrary to the original scatter-free model, i.e., assuming homogeneous magnetic fields on both sides of the shock. It is suggested that 'shock spike' events are due to multiple crossings of the field line with the shock.
Balogh André
Erdos Géza
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