June 1991 cosmic-ray event as observed according to GRANAT satellite data

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Solar Cosmic Rays, Solar Flares, Satellite Observation, Energy Spectra, Interplanetary Magnetic Fields, Galactic Cosmic Rays

Scientific paper

An analysis of the June 1991 enhancement of solar cosmic-ray (SCR) intensity in the energy range 1-20 MeV and at higher energies is made on the basis of Granat satellite data. The event was initiated by a series of six powerful solar flares generated in the same active region at solar longitudes from 65 deg E to 69 deg W. The flares were of approximately equal power and followed at intervals from 1 to 4 days. Up to June 11, 1991, the SCR enhancement behavior does not indicate a direct relation with solar flares. Some relations were found only by using the fact of the appearance of solar flares in one and the same active region that traversed the solar disk from the eastern to the western limb. These circumstances defined the significant role of the solar-longitude effect in the propagation of solar cosmic rays and flare disturbances. The use of a 'reflection' model made it possible to reveal the relations of solar flares with the modulation of solar and galactic cosmic rays.

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