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Elimination of projection effects from vector magnetograms - The pre-flare configuration of active region AR 4474A simple method of transforming vector magnetograms to heliographic coordinates is demonstrated. The merits of this transformation are illustrated using a vector magnetogram obtained with the MSFC vector magnetograph 80 minutes prior to a white light flare in active region AR 4474 on April 25, 1984. The original magnetogram shows strong magnetic shear along the neutral line at both the flare site and a nonflaring site. The transformation of the magnetogram to heliographic coordinates shows that the elimination of projection effects results in a much shorter length of the sheared region at the nonflaring site than what is inferred from the image plane vector magnetogram. The length of the sheared region at the flare site is relatively less affected by the transformation.
Document ID
19890031638
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Venkatakrishnan, P.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Hagyard, M. J.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Hathaway, D. H.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1988
Publication Information
Publication: Solar Physics
Volume: 115
Issue: 1, 19
ISSN: 0038-0938
Subject Category
Solar Physics
Accession Number
89A19009
Distribution Limits
Public
Copyright
Other

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