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Delta spots and great flares

Zirin, Harold and Liggett, Margaret A. (1987) Delta spots and great flares. Solar Physics, 113 (1-2). pp. 267-283. ISSN 0038-0938. https://resolver.caltech.edu/CaltechAUTHORS:20200602-123444467

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Abstract

Using eighteen years of observations at Big Bear, we summarize the development of δ spots and the great flares they produce. We find δ groups to develop in three ways: eruption of a single complex active region formed below the surface, eruption of large satellite spots near (particularly in front of) a large older spot, or collision of spots of opposite polarity from different dipoles. Our sample of twenty-one δ spots shows that once they lock together, they never separate, although rarely an umbra is ejected. The δ spots are already disposed to their final form when they emerge. The driving force for the shear is spot motion, either flux emergence or the forward motion of p spots in an inverted magnetic configuration.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1007/bf00147707DOIArticle
https://ui.adsabs.harvard.edu/abs/1987SoPh..113..267Z/abstractADSArticle
Additional Information:© 1987 by D. Reidel Publishing Company. Published 01 January 1987. This work was supported by NASA under NGL 05-002-034, the NSF under ATM-8513577, and the AFOSR through AFOSR-87-0034. We are grateful to the Big Bear staff for gathering the data, and to Prof. K. Tanaka for many useful discussions.
Funders:
Funding AgencyGrant Number
NASANGL 05 002 034
NSFATM-8513577
Air Force Office of Scientific Research (AFOSR)AFOSR-87-0034
Subject Keywords:Flare; Fibril; Active Region; Opposite Polarity; Forward Motion
Issue or Number:1-2
Record Number:CaltechAUTHORS:20200602-123444467
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200602-123444467
Official Citation:Zirin, H., Liggett, M.A. Delta spots and great flares. Sol Phys 113, 267–283 (1987). https://doi.org/10.1007/BF00147707
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103637
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:02 Jun 2020 20:15
Last Modified:02 Jun 2020 20:15

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