Two classes of cosmic ray decrease

Details Two classes of cosmic ray decrease Two classes of cosmic ray decrease

Apr 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.1189v&link_type=abstract

Journal of Geophysical Research, vol. 80, Apr. 1, 1975, p. 1189-1201.

Physics

5

Cosmic Ray Showers, Forbush Decreases, Neutron Flux Density, Twenty-Seven Day Variation, Galactic Radiation, Neutron Counters, Primary Cosmic Rays, Solar Activity Effects, Sudden Storm Commencements, Transient Response, Upper Atmosphere

Scientific paper

In a study of galactic cosmic ray intensity variations it had been found that there are two distinct classes of transient intensity decrease, which have been called type I and type II. Type I events are flare-associated Forbush decreases. Type II events appear to be associated with 27-day recurrences. It is suggested, on the basis of several characteristics of the decreases, that type II events are simply the subsequent evolution of type I events or quasi-stationary 'corotating' structures loosely associated with active regions.

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