Heliocentric radius of the cosmic ray modulation boundary

Details Heliocentric radius of the cosmic ray modulation boundary Heliocentric radius of the cosmic ray modulation boundary

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..628r&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, July 1986, p. 628-631.

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17

Cosmic Rays, Energetic Particles, Heliosphere, Modulation, Solar Cycles, Energy Spectra, Long Term Effects, Pioneer Space Probes, Radii, Solar Activity Effects

Scientific paper

The authors have made a semi-empirical analysis of their extensive body of observed cosmic ray intensity data from Pioneers 10 and 11 and related spectral information from other authors in order to infer the radius R of the modulation region surrounding the sun. During the period 1972 - 1985 the inferred values of R vary with time systematically and in a manner generally similar to that of sunspot numbers. The range of values of R is from 42 AU at the time of minimum solar activity (≡1976) to 88 AU about 1.5 yr following the time of maximum solar activity (≡1980). A specific, testable prediction is that Pioneer 10 will reach the modulation boundary in 1988 and will remain in its vicinity for several years thereafter.

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