On umbral flashes in different sunspot groups

Details On umbral flashes in different sunspot groups On umbral flashes in different sunspot groups

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...91...51t&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 91, March 1984, p. 51-54.

Physics

4

Solar Flares, Solar Magnetic Field, Sunspots, Umbras, Frequency Distribution, Spectroheliographs, Statistical Analysis

Scientific paper

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: (1) position on the solar disk; (2) group area; (3) sunspot area; (4) maximum magnetic field strength of a sunspot; (5) modified Zuerich class; (6) sunspot age; (7) magnetic structure; and (8) 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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