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A Flare and Umbral Flashes in a Sunspot

Turova, I. P.; Ozhogina, O. A.; Yurysheva, O. V.

We studied the evolution and dynamic processes in the chromosphere above a sunspot umbra. A relatively rarely occurring phenomenon of bright long-lasting emission observed in the umbra of a unipolar sunspot of the AR 9570 group on August 11, 2001 was investigated. It was found that during the course of the observation, emission was spreading, grad…