Hysteresis of primary cosmic rays associated with Forbush decreases

Details Hysteresis of primary cosmic rays associated with Forbush decreases Hysteresis of primary cosmic rays associated with Forbush decreases

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976aujph..29...89r&link_type=abstract

Australian Journal of Physics, vol. 29, Mar. 1976, p. 89-95.

Physics

Forbush Decreases, Hysteresis, Primary Cosmic Rays, Satellite-Borne Instruments, Sunspot Cycle, Geiger Counters, Ogo, Regression Analysis, Upper Atmosphere

Scientific paper

A variation of quasi-steady primary-cosmic-ray intensities during Forbush events is reported which was detected in data obtained by a neutron monitor, the OGO 1 and 3 ion chambers, and daily observations of upper-atmosphere intensities recorded with standardized Geiger-Mueller counters. A regression plot of the intensities of high- and low-rigidity primaries is found to exhibit hysteresis loops during Forbush decreases, indicating a differential modulation between the two intensities. It is shown that this effect is superposed on the 11-year variation of primary intensities, which is known to exhibit a hysteresis as a function of sunspot number. The existence of loops during Forbush events is explained in terms of a long-range order for the magnetic inhomogeneities in the modulation region.

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