Abstract
Since the launch of the Solar Maximum Mission (SMM) satellite the gamma ray Spectrometer (GRS) has been monitoring the Sun in the energy range 0.3-1000 MeV. Because of its large geometric area and good spectral resolution, the GRS has provided unprecedented spectral and temporal information about solar flares, of which 139 have been monitored. An analysis of the temporal distribution of these high-energy events provides information on solar activity and find that, instead of being randomly distributed in time, these events have a tendency to occur in groups with a mean spacing of about 154 days (75nHz) over the observing interval. A large sample of flares (>500), with an x ray classification of > or = M 2.5 recorded by the GOES satellite, showed a similar regularity. Keywords: Solar flares.
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