Letter from Thomas Gold to Dr Arthur B C Walker, Institute for Plasma Reserch, Stanford University, Stanford, California In response to his letter requesting views on solar physics priblems, Gold is sending him the report prepared a year ago for USRA. It contains many points that he may consider pertinent, and it appears to have had a large measure of agreement in the solar physics community. Among the experiments Gold considers important, he would stress again, as he has since the beginning of the space program, that a satellite-borne, long lived monitoring system of the solar constant is of vital importance to climatic research. This in turn is of the greatest practical importance. Such a system is technically difficult, but possible. 12 June 1979