Physics
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.2170d&link_type=abstract
Journal of Geophysical Research, vol. 82, June 1, 1977, p. 2170-2174. NSF-sponsored research.
Physics
7
Forbush Decreases, Particle Flux Density, Solar Activity Effects, Solar Cosmic Rays, Solar Flares, Interplanetary Magnetic Fields, Nucleons
Scientific paper
It is reported that, in a statistical sense, solar flares, heretofore regarded as the predominant source of cosmic ray intensity variations, actually do not precede the reduction in flux observed at earth. Superposed epoch analysis of the cosmic ray data with respect to the time of occurrence of all 379 solar flares whose importance parameter (Imp) has a value of 2 or greater and which were observed during solar cycle 20 (1964 to 1974 inclusive) shows that the onset of a decrease in the composite nucleonic intensity at polar stations occcurs prior to the zero day (i.e., time of the flare) well before the arrival in the vicinity of earth of the associated solar plasma. Although flares in the eastern region of the sun might be associated with cosmic ray decrease, this decrease, in general, is coordinated with the central meridian passage (plus or minus one day) of the active regions.
Duggal Shakti P.
Pomerantz Marin A.
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