Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982cha%26a...6..186l&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 6, Issue 3, p. 186-192.
Astronomy and Astrophysics
Astrophysics
2
Scientific paper
An analysis of 20 flares of spotless regions observed at Yunnan Observatory during the peak years of Cycle 21 shows 1) the fraction of flares produced in spotless regions is about 3%, 2) their Carrington longitudes show a tendency to drift eastward, 3) the majority of spotless flares are low-energy flares, 4) the background conditions for producing spotless flares are the same as for flares in general, namely, there must be local magnetic structures of opposite polarities. The spotless flares occur on the sides or in the vicinity of the local neutral line.
The quiescent dark filaments floating on the neutral line are activated a few hours and one or two days before the flare, the filament nearest to the flare position first enlarges, accompanied by brightening of plages. A few minutes before the flare, or during the flare, this filament rapidly weakens, even vanishes. Meanwhile, visible fibrils become less inclined to the main filament showing pressure force is transformed into shear force.
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