Propagation characteristics of relativistic solar cosmic rays during current sunspot cycle

Physics – Space Physics

Scientific paper

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Cosmic Rays, Solar Cycles, Solar Flares, Solar Radiation, Mesons, Propagation, Solar Flux, Solar Neutrons

Scientific paper

The occurrence of relativistic solar cosmic ray event is a rare phenomenon recorded by ground-based detectors during intense solar flares. Unusually a large number of solar particle events have been observed during August-October 1989 in the ascending phase of current solar cycle 22. The characteristic features of 29 Sep. 1989 event, which was the most energetic solar particle event after 23 Feb. 1956, are discussed. From the examination of this solar particle event, it is found that particles of extended energy range have been released simultaneously without any preferred direction of their arrival near the earth. The source flare region along with interplanetary conditions shows that particles covered their path through diffusive propagation from flare region to the earth.

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