A qualitative hypothesis is given that attributes recurrent “M-region” geomagnetic disturbances to the arrival at the earth of solar corpuscles that have been gathered into beams by the deflecting action of coronal-region fields, presumably magnetic, associated with centers of heightened solar activity. The hypothesis identifies the source of solar corpuscles that produces M-region magnetic disturbances with “quiet areas” of the solar surface. A related hypothesis associates non-recurrent magnetic storms, the greatest ones, with a different solar corpuscular source, found in the active region itself.
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Pecker et al. (1955) studied this question.
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