Magnetic clouds and interplanetary particle transport: a numerical model

Details Magnetic clouds and interplanetary particle transport: a numerical model Magnetic clouds and interplanetary particle transport: a numerical model

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jastp..64.1973k&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 64, Issue 18, p. 1973-1978.

Physics

4

Scientific paper

Magnetic clouds modify the structure of the interplanetary magnetic field on spatial scales of tenth of AU. Their influence on the transport of energetic charged particles is studied with a numerical model that treats the magnetic cloud as an outward propagating modification of the focusing length. As a rule of thumb, the influence of the magnetic cloud on particle intensity and anisotropy profiles increases with decreasing particle mean free path and decreasing particle speed. Three cases are considered: (1) when the magnetic cloud is the driver of a shock that accelerates particles as it propagates outward, (2) when the magnetic cloud interacts with a prior solar energetic particle event, and (3) when a magnetic cloud already is present in interplanetary space at the time of a solar energetic particle event. In the latter case the cloud acts as a barrier, storing the bulk of the particles in its downstream medium.

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