Emission of corpuscles from the Sun

The arguments in favor of the existence of solar corpuscles are reviewed and the geomagnetic action analyzed. The emission of the storm-producing corpuscles is discussed in terms of the Milne-mechanism acting on Ca II ions, based on modern data on flares and on the chemical composition of the solar atmosphere. The long-lived streams of solar corpuscles producing moderate disturbances of the earth's magnetic fields are identified with invisible extensions of the coronal streamers. They can be quantitatively understood as an evaporation of coronal protons into space. The unobservable M-regions are probably associated with the coronal streamers.