Shock drift mechanism for Forbush decreases

Details Shock drift mechanism for Forbush decreases Shock drift mechanism for Forbush decreases

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...350..413c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 350, Feb. 10, 1990, p. 413-418. Research supported by NASA.

Astronomy and Astrophysics

Astrophysics

11

Cosmic Rays, Forbush Decreases, Interplanetary Medium, Shock Wave Propagation, Energetic Particles, Magnetic Moments

Scientific paper

Consideration is given to the way in which Forbush decreases can arise from variable drifts in nonuniform shocks, where the variation in shock strength along the shock front causes both the shock drift distance and the energy gain to become variable. More particles can then be transported out of a given region of space and energy interval than were transported in, so a spacecraft passing through this region can observe a Forbush decrease in this energy interval despite shock energization and compression. A simple example of how this can occur is presented.

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