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The significance of vector magnetic field measurementsObservations of four flaring solar active regions, obtained during 1980-1986 with the NASA Marshall vector magnetograph (Hagyard et al., 1982 and 1985), are presented graphically and characterized in detail, with reference to nearly simultaneous Big Bear Solar Observatory and USAF ASW H-alpha images. It is shown that the flares occurred where local photospheric magnetic fields differed most from the potential field, with initial brightening on either side of a magnetic-neutral line near the point of maximum angular shear (rather than that of maximum magnetic-field strength, typically 1 kG or greater). Particular emphasis is placed on the fact that these significant nonpotential features were detected only by measuring all three components of the vector magnetic field.
Document ID
19910039583
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hagyard, M. J.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1990
Publication Information
Publication: Societa Astronomica Italiana, Memorie
Volume: 61
Issue: 2, 19
ISSN: 0037-8720
Subject Category
Solar Physics
Accession Number
91A24206
Distribution Limits
Public
Copyright
Other

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