The eleven-year cosmic ray cycle

Details The eleven-year cosmic ray cycle The eleven-year cosmic ray cycle

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976izssr..40..589l&link_type=abstract

(Vsesoiuznaia Konferentsiia po Fizike Kosmicheskikh Luchei, Samarkand, Uzbek SSR, Oct. 29-31, 1975.) Akademiia Nauk SSSR, Izvest

Computer Science

Cosmic Rays, Solar Activity Effects, Solar Wind, Sunspot Cycle, Forbush Decreases, Polar Regions, Solar Protons

Scientific paper

The behavior of the nineteenth and twentieth 11-year galactic cosmic ray cycles is studied, and the principal characteristics of the 11-year cycle are reviewed. It is shown that toward the end of the nineteenth cycle, a strong solar wind was present which, in spite of a pronounced drop in activity with respect to the Wolf number, generated a substantial gas shell (particularly in the polar regions of the heliosphere) that inhibited a rapid growth in cosmic ray intensity. In the twentieth cycle, the solar wind was weaker by a factor of 2, and possibly decreased still further during 1970 through 1971. The transmittance of the gas shell is high for high energies and low for low energies. This means that a decrease in solar wind intensity is accompanied by an increase in the low-energy cosmic ray flux propagating in directions normal to the ecliptic plane.

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