A study of the long-term variation and radial gradient of cosmic rays out to 23 AU

Details A study of the long-term variation and radial gradient of cosmic rays out to 23 AU A study of the long-term variation and radial gradient of cosmic rays out to 23 AU

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....8611458w&link_type=abstract

Journal of Geophysical Research, vol. 86, Dec. 1, 1981, p. 11458-11462.

Physics

36

Cosmic Rays, Long Term Effects, Radial Distribution, Radiation Transport, Annual Variations, Modulation, Propagation Velocity, Solar Wind, Transport Properties

Scientific paper

It is shown by an examination of Pioneer, Voyager and IMP spacecraft cosmic ray long-term modulation data, for the case of E greater than 60 MeV in the period 1972-1980, that (1) long-term modulation effects are propagated outward radially from the sun with a typical speed of 350-500 km/sec; (2) the average integral radial gradient over the period, between 2 and 23 AU, is 2.85 + or - 0.5% AU, and (3) the boundary of the heliocentric modulation region in the ecliptic plane, as derived from simple conventional modulation theory, is greater than 65 AU. It is concluded that the weak dependence of the average gradient upon cosmic ray intensity may be used to estimate the location of the boundary in a standard modulation model.

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