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The association of flares to cancelling magnetic features on the sunPrevious work relating flares to evolutionary changes of photospheric solar magnetic fields are reviewed and reinterpreted in the light of recent observations of canceling magnetic fields. The results show that cancelation happens with fields spanning a wide range of magnetic field strengths. Flares of all magnitudes begin adjacent to cancelation sites, whether the associated active region as a whole is developing or decaying. Both small and big flares are initiated near canceling sites, from the microflares associated with ephemeral regions to the kernels of the great flares. Canceling magnetic flux is observed or deduced to be the common denominator among all observed associations of flares to changing magnetic fields. It is proposed that canceling magnetic fields are a necessary evolutionary condition for the initiation of solar flares.
Document ID
19900027759
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Livi, Silvia H. B.
(Rio Grande do Sul, Universidade Federal, Porto Alegre, Brazil)
Martin, Sara
(Universidade Federal do Rio Grande do Sul Porto Alegre, Brazil)
Wang, Haimin
(Big Bear Solar Observatory Pasadena, CA, United States)
Ai, Guoxiang
(Beijing Observatory People's Republic of China, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1989
Publication Information
Publication: Solar Physics
Volume: 121
Issue: 2-Jan
ISSN: 0038-0938
Subject Category
Solar Physics
Accession Number
90A14814
Funding Number(s)
CONTRACT_GRANT: NSF ATM-85-13577
CONTRACT_GRANT: NGL-05-002-034
CONTRACT_GRANT: AF-AFOSR-87-0023
Distribution Limits
Public
Copyright
Other

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