Magnetic clouds and interplanetary particle transport: a numerical model
Autor(en): | Kallenrode, MB | Stichwörter: | ACCELERATION; ADIABATIC DECELERATION; energetic particles; Geochemistry & Geophysics; interplanetary medium; magnetic clouds; Meteorology & Atmospheric Sciences; particle propagation; PROPAGATION; SHOCKS | Erscheinungsdatum: | 2002 | Herausgeber: | PERGAMON-ELSEVIER SCIENCE LTD | Journal: | JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS | Volumen: | 64 | Ausgabe: | 18 | Startseite: | 1973 | Seitenende: | 1978 | Zusammenfassung: | 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. (C) 2002 Published by Elsevier Science Ltd. |
ISSN: | 13646826 | DOI: | 10.1016/S1364-6826(02)00195-5 |
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