Abstract
It has been usual to consider the effects near the earth even for that part of cosmic rays with solar origin. An examination of the conditions near the source, the sun, shows that the emission has taken place only from limited portions-western limb and C. M. in a small latitudinal belt on either side of the equator-of an extremely active solar region with long history, whose area is relatively large and compact and whose magnetic field is marked. The concurrent ionospheric and subsequent geomagnetic effects have also been considered. The large geophysical events seem definitely controlled by the conditions on the sun.
