Solar influences on the radiation field in space.

I N THE last three years, progress ,in the understanding of the production of cosmic rays by the sun has been rapid. This is because the period of high solar activity provided a large variety of events to study and many new types of measurements were developed. At the present time we have data obtained on the solar cosmic rays at high altitude with nuclear emulsions both in balloons and in rockets, Wilson cloud chambers carried in balloons, many types of counting instruments at various latitudes and longitudes, and, in a number of cases, with counters in an earth satellite. The cosmic rays have also been measured in space 5,000,000 km from earth with a space probe. Although most of the solar cosmic ray particles have been identified as protons, analysis of nuclear emulsions exposed under proper conditions has shown s-particles and heavy nuclei up to Z --16 in the solar beams. The propagation from the sun to the earth has shown many complex features associated with magnetic fields in space. These magnetic fields have now been directly observed with space probes. The association between the propagation of the solar