On the triggering of a spotless double-ribbon flare

Details On the triggering of a spotless double-ribbon flare On the triggering of a spotless double-ribbon flare

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..142..131r&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 142, no. 1, p. 131-141.

Physics

3

Faculae, Solar Flares, Solar Magnetic Field, H Alpha Line, Photosphere

Scientific paper

We have studied the evolution of the double-ribbon, spotless flare of 21 February, 1992, using Kodaikanal H-alpha and Kfl observations. The analysis of the data shows that the H-alpha filament underwent a large change in shear prior to the day of the onset of the flare. We find considerable rotation of the plage region before the emergence of a small magnetic pore. It is concluded that shear plays an important role in the triggering of a spotless flare.

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