Shock acceleration as explanation for steplike changes and hysteresis in cosmic ray modulation

Details Shock acceleration as explanation for steplike changes and hysteresis in cosmic ray modulation Shock acceleration as explanation for steplike changes and hysteresis in cosmic ray modulation

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.1355s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Feb. 1, 1986, p. 1355-1360.

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4

Galactic Cosmic Rays, Hysteresis, Phase Modulation, Shock Wave Propagation, Solar Flares, Heliosphere, Neutron Counters, Propagation Velocity, Solar Activity Effects

Scientific paper

When the counting rates of neutron monitors at two different cutoff rigidities are plotted against each other, steplike changes in the rigidity dependence of the modulation are observed, leading to the well-known hysteresis effect. These steplike changes are generally related to the modulation effects of solar flare-induced shocks propagating through the heliosphere. Shock acceleration as a mechanism for the steplike changes has however not yet been considered explicitly. Therefore, in this paper it is shown that the acceleration effects of multiple shocks in the outer heliosphere may indeed explain these steps.

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