Polar Coronal Holes and Cosmic-Ray Modulation

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Science  15 Feb 1980:
Vol. 207, Issue 4432, pp. 761-763
DOI: 10.1126/science.207.4432.761


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.