Abstract
We have studied the evolution of the double-ribbon, spotless flare of 21 February, 1992, using Kodaikanal Hα and Kf1 observations. The analysis of the data shows that the Hα 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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Rausaria, R.R., Aleem, S.M. & Raman, K.S. On the triggering of a spotless double-ribbon flare. Sol Phys 142, 131–141 (1992). https://doi.org/10.1007/BF00156637
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DOI: https://doi.org/10.1007/BF00156637