Differences in the solar modulation of E greater than 60 MeV cosmic rays at earth and 18 AU during a complete 11-year cycle from 1977 to 1988

Details Differences in the solar modulation of E greater than 60 MeV cosmic rays at earth and 18 AU during a complete 11-year cycle from 1977 to 1988 Differences in the solar modulation of E greater than 60 MeV cosmic rays at earth and 18 AU during a complete 11-year cycle from 1977 to 1988

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.2427l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, March 1, 1990, p. 2427-2431.

Physics

14

Cosmic Ray Showers, Earth Atmosphere, Solar Activity Effects, Solar Cycles, Current Sheets, Magnetic Fields, Pioneer Project, Radiant Flux Density, Voyager Project

Scientific paper

The cosmic ray intensities for E greater than 60 MeV particles at a constant radius of 18 AU using data from the IMP, Voyager and Pioneer spacecraft. These intensities are compared with the intensities at earth for a complete 11-year cycle from 1977 to 1988. It is found that the variations at 1 AU and 18 AU track very closely during the decreasing portion of the cycle from 1977 to 1982 but during the recovery the intensity at 18 AU increases much less than at earth with the result that in 1987 the intensity is only 82 percent of that at the previous minimum in 1977. These results imply that the integral radial gradient between 1 and 18 AU is constant in time from 1977 to 1982 but decreases from 1982 to 1988. Thus, the amplitude of the 11-year variation observed at a fixed energy is quite strongly radially dependent, with the amplitude becoming less at larger radii.

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