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 producesM‐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 activ