Abstract

Comparisons have been made of the cosmic ray intensities measured by the Pioneer 8 detector and by ground-based neutron monitors located at different vertical cutoff rigidities for three Forbush decreases in 1968 and for the 11-year solar modulation. It is observed that the rigidity dependence of the three large Forbush decreases was substantially different than the corresponding 11-year variation at rigidities from <1 to >50 Gv.

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