Solar activity and modulation of the cosmic ray intensity

Details Solar activity and modulation of the cosmic ray intensity Solar activity and modulation of the cosmic ray intensity

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.4439a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, May 1, 1985, p. 4439-4447.

Physics

8

Cosmic Rays, Interplanetary Magnetic Fields, Solar Activity, Solar Flares, Sunspot Cycle, Equatorial Regions, Heliosphere, Particle Flux Density, Shock Waves, Sudden Storm Commencements, Transfer Functions

Scientific paper

Since its discovery by Forbush (1954), the 11-year cycle modulation of the cosmic ray intensity has been studied extensively. Bowe and Hatton (1982) obtained a well-behaved transfer function F between the solar activity S and the cosmic ray intensity modulation Io-I. They suggested that the 11-year variation for sunspot cycle 20 can be attributed to the modulating effect of solar flare-induced shocks propagating through the heliosphere. The cosmic ray intensity in the absence of solar activity is denoted by Io, while I denotes the observed intensity. Bowe and Hatton infer that the boundary of the heliosphere is located at a distance of 70-90 AU. Since their conclusion is of great importance in understanding the mechanism of the 11-year modulation, the present investigation is concerned with a repetition of their study for two cycles, taking into account the use of a slightly modified method. The obtained results confirm the conclusions reached by Bowe and Hatton that there is a well-behaved transfer function for solar flares.

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