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Science 15 February 1980:
Vol. 207. no. 4432, pp. 761 - 763
DOI: 10.1126/science.207.4432.761
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Articles

Polar Coronal Holes and Cosmic-Ray Modulation

A. J. HUNDHAUSEN 1, D. G. SIME 1, R. T. HANSEN 1, and S. F. HANSEN 1

1 High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado 80307

A comparison of the size of polar coronal holes with the cosmic-ray intensity observed during the most recent sunspot cycle shows close correspondence. This lends support to recent suggestions that the well-known sunspot-cycle modulation of cosmic rays is a three-dimensional effect, probably related to the global character of the interplanetary magnetic field.

Submitted on September 14, 1979

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Science. ISSN 0036-8075 (print), 1095-9203 (online)