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Delta spots and great flaresThe 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.
Document ID
19880050671
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Zirin, Harold
(California Inst. of Tech. Pasadena, CA, United States)
Liggett, Margaret A.
(Big Bear Solar Observatory Pasadena, CA, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Publication Information
Publication: Solar Physics
Volume: 113
Issue: 1-2
ISSN: 0038-0938
Subject Category
Solar Physics
Accession Number
88A37898
Funding Number(s)
CONTRACT_GRANT: NGL-05-002-034
CONTRACT_GRANT: NSF ATM-85-13577
CONTRACT_GRANT: AF-AFSOR-87-0034
Distribution Limits
Public
Copyright
Other

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