On the disappearance of a small sunspot group

descriptionPublicationkeyboard_double_arrow_right Article 01 Nov 1982 English Publisher:Springer Science and Business Media LLCJournal:Solar Physics, volume 81, pages 33-46 (issn: 0038-0938, eissn: 1573-093X,

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Authors: Steven G. Wallenhorst; Kenneth P. Topka;

doi: 10.1007/bf00151977

On the disappearance of a small sunspot group

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Abstract

The small sunspot group associated with Hale active region 17694 was observed jointly by the Mount Wilson and the Big Bear Solar Observatories, through the time of sunspot disappearance. The magnetic flux from the region was seen to decrease by about 10% per day during the observing interval. This was accompanied by fragmentation of the dominant spot as a supergranule network formed. No evidence for spreading or diffusion of the active region field was found.

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Carnegie Institution for Science
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California Institute of Technology
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