Large sunspot group of April - August 1991 and the white flare in it. I.

Details Large sunspot group of April - August 1991 and the white flare in it. I. Large sunspot group of April - August 1991 and the white flare in it. I.

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992bsold..11...61s&link_type=abstract

Byulletin Solnechnye Dannye Akademie Nauk USSR, No. 11/92, p. 61 - 69

Physics

Scientific paper

The evolution of a gigantic sunspot group observed in April - August 1991 is studied. The group appeared at an anomalously high latitude (φ = +30 - 35°) for the epoch of maximum and was characterized with large area variation. It was a secondary outburst of activity of the deep source, a more powerful event in February 1989. At the phase of their maximum of evolution the groups reached 4800 and 2700 m.f. in area correspondingly, and were very large multiumbral sunspots similar in character. A large periphery filament embracing the group was studied. Its systematic expansion was detected during four synodic rotations. This is evidence for the expansion of the polarity vision line i.e. expansion of the magnetic field across the solar surface. The migration velocity of the field's front is estimated to be 10 m/sec. A connection of all large flares of the sunspot group (importance 2 - 4) with periphery stationary filaments has been detected.

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