Flare development in active region NOAA 6891, 30 October, 1991

Details Flare development in active region NOAA 6891, 30 October, 1991 Flare development in active region NOAA 6891, 30 October, 1991

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995soph..158..383b&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 158, no. 2, p. 383-386

Physics

Solar Flares, Solar Physics, Sun, Sunspots, Charge Coupled Devices, Size Distribution, Solar Instruments, Velocity

Scientific paper

A great sunspot group of October 1991 (NOAA 6891 at L = 189, B = -10) was observed, in which an eruptive flare of importance (X2.5/3B) has been reported. A Ca II-line 3933 A filter was used, and during a time interval of 3 hours more than 90 frames were taken, using a CCD camera. The progress and the distribution in size of the two main flare points have been obtained; they covered an area of about 1800 millionths of the solar disk within a time interval of about 24 min. The average apparent horizontal velocity was 70 km/s.

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