On the triggering of a spotless double-ribbon flare |
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| Authors: | R R Rausaria S M Aleem K Sundara Raman |
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| Institution: | (1) Indian Institute of Astrophysics, 624 103 Kodaikanal, India |
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| Abstract: | We have studied the evolution of the double-ribbon, spotless flare of 21 February, 1992, using Kodaikanal H and Kf1 observations. The analysis of the data shows that the H 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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