NASA NTRS · 19880050671
Delta spots and great flares
Abstract
The development of delta spots and the great flares they produce are reviewed based on 18 years of observations. Delta groups are found to develop in three ways: (1) by the eruption of a single complex active region formed below the surface; (2) by the eruption of large satellite spots near a large older spot; and (3) by the collision of spots of opposite polarity from different dipoles. It is shown that the present sample of 21 delta spots never separate once they lock together, and that the driving force for the shear is spot motion. Indicators for the prediction of the occurrence of great flares are identified.
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Zirin, Harold, Liggett, Margaret A.. 1987-01-01. Delta spots and great flares. https://ntrs.nasa.gov/citations/19880050671
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