Physics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.8769b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, July 1, 1989, p. 8769-8781.
Physics
14
Interplanetary Medium, Mean Free Path, Particle Acceleration, Proton Energy, Shock Wave Propagation, Anisotropic Media, Magnetic Variations, Resonance Scattering, Solar Wind
Scientific paper
The relation betweeen the mean free paths of low-energy protons upstream of interplanetary shocks and the coincident magnetic field fluctuations was investigated. Mean free paths were calculated from time intensity profiles of low-energy protons associated with five interplanetary shocks observed by ISEE 3 between August 1978 and December 1981. For the same time periods (3 to 14 hrs preceding the shocks), the ISEE magnetic field data were also analyzed. The scattering mean free path was calculated using two models, the first assuming that the particle scattering is due only to resonance scattering by Alfven waves, and the second assuming scattering being due to a mixture of Alfven and magnetosonic waves. The latter model led to results that agree well with the results of the particle study, indicating that, in addition to Alfven waves, magnetosonic waves play an important role in particle scattering upstream of interplanetary traveling shocks.
Beeck J.
Sanderson T. R.
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