The High-Energy Gamma-Ray Flare of June, 15, 1991: Some Evidence of Prolonged Particle Acceleration at the Post-Eruption Phase

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We compare the high-energy (up to 2 GeV) prolonged (at least 2 hours) gamma-ray emission, observed by the gamma-telescope GAMMA-1 in the June 15, 1991 flare, with microwave bursts and solar cosmic rays. The comparison testifies that the gamma-ray and radio emissions, observed well after the impulsive phase of the flare, appear to be initiated by prolonged nonstationary particle acceleration during the late phase of the flare rather than a long-term trapping of energetic electrons and protons accelerated at the onset of the flare. It is suggested that such an acceleration may be associated with a long post-eruption energy release following a coronal mass ejection.

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