Piston shock and Forbush effect

Details Piston shock and Forbush effect Piston shock and Forbush effect

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009astl...35..696k&link_type=abstract

Astronomy Letters, Volume 35, Issue 10, pp.696-700

Astronomy and Astrophysics

Astronomy

Scientific paper

A model of a piston shock produced by a sharp jump in the velocity of the solar wind with a helical magnetic field is suggested to explain the origin of the Forbush decrease of cosmic rays with a hard energy spectrum at solar activity minimum and, in some cases, at solar activity maximum. The contact velocity, the compression ratio, the contact position, the ratio of the magnetic field near the contact to the seed field, the maximum momentum of the particles subjected to modulation, and the modulation depth for the neutron and muon cosmic ray components have been calculated. The theoretical calculations are compared with experimental data.

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