On umbral flashes in different sunspot groups |
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Authors: | I. P. Turova |
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Affiliation: | (1) Siberian Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Irkutsk, U.S.S.R. |
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Abstract: | The results of a statistical investigation of the occurrence of umbral flashes for 40 sunspot groups are reported for the period 1966–1983. The following characteristics were chosen for the analysis: (a) position on the solar disk; (b) group area; (c) sunspot area; (d) maximum magnetic field strength of a sunspot; (e) modified Zürich class; (f) sunspot age; (g) magnetic structure; and (h) flare activity of a group. The dependence of umbral flashes on magnetic structure of a sunspot is the most essential feature. The absence of umbral flashes in the umbrae of main sunspots perhaps may be used as one of the predictors of flare activity. |
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