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The Optical Flare

Zirin, H. (1983) The Optical Flare. In: Recent Advances in the Understanding of Solar Flares. Springer Netherlands , Dordrecht, pp. 173-184. ISBN 9789400972308.

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Optical observations now present considerable information on the flare process. It is always associated with filaments and with simplification of existing magnetic connections, and it arises from the emergence and expansion of new flux. The optical flare divides into impulsive phase, with multiple flashes along the neutral line, and thermal phase, with two-ribbon expansion. The former bears some resemblance to tearing mode phenomena. The appearance of loops in emission requires very high densities in those phenomena. The ratios of the hydrogen lines, the excitation of HeII 4686, and the relation of vertical to horizontal structure all remain to be explained.

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Additional Information:© D. Reidel Publishing Company, Dordrecht, Holland 1983. This survey has been prepared during my stay at Meudon. I thank Dr. Henoux for his hospitality, and the Ministère d'Etat à la Recherche et à la Technologie for a grant supporting my visit. The research at Big Bear was supported by the National Science Foundation under ATM-8112698 and by NASA under NGL 05 002 034.
Funding AgencyGrant Number
Ministère d'Etat à la Recherche et à la TechnologieUNSPECIFIED
NASANGL 05 002 034
Subject Keywords:Neutral Line; Impulsive Phase; Thermal Phase; Balmer Line; Black Body Emission
Record Number:CaltechAUTHORS:20201009-102843529
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105956
Deposited By: George Porter
Deposited On:09 Oct 2020 22:16
Last Modified:16 Nov 2021 18:48

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