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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Reference
Moore, R. L.: 1981, Space Sci. Rev. 28, 387.
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Turova, I.P. On umbral flashes in different sunspot groups. Sol Phys 91, 51–54 (1984). https://doi.org/10.1007/BF00213610
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DOI: https://doi.org/10.1007/BF00213610