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A Search for Vector Magnetic Field Variations Associated with the M-Class Flares of 1991 June 10 in AR 6659A careful analysis of a 6-hour time sequence of vector magnetograms of AR 6659, observed on 1991 June 10 with the MSFC vector magnetograph, has revealed only minor changes in the vector magnetic field azimuths in the vicinity of two M-class flares, and the association of these changes with the flares is not unambiguous. In this paper we present our analysis of the data which includes comparison of vector magnetograms prior to and during the flares, calculation of distributions of the rms variation of the azimuth at each pixel in the field of view of the active region, and examination of the variation with time of the azimuths at every pixel covered by the main flare emissions as observed with the H-alpha telescope coaligned with the vector magnetograph. We also present results of an analysis of evolutionary changes in the azimuth over the field of view of the active region.
Document ID
19980227496
Acquisition Source
Marshall Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Hagyard, Mona J.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Stark, B. A.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Venkatakrishnan, P.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Date Acquired
August 18, 2013
Publication Date
February 1, 1998
Subject Category
Solar Physics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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