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Resolving the Azimuthal Ambiguity in Vector Magnetogram Data with the Divergence-Free Condition: Theoretical ExaminationWe demonstrate that the azimuthal ambiguity that is present in solar vector magnetogram data can be resolved with line-of-sight and horizontal heliographic derivative information by using the divergence-free property of magnetic fields without additional assumptions. We discuss the specific derivative information that is sufficient to resolve the ambiguity away from disk center, with particular emphasis on the line-of-sight derivative of the various components of the magnetic field. Conversely, we also show cases where ambiguity resolution fails because sufficient line-of-sight derivative information is not available. For example, knowledge of only the line-of-sight derivative of the line-of-sight component of the field is not sufficient to resolve the ambiguity away from disk center.
Document ID
20090022172
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
Authors
Crouch, A.
(Northwest Research Associates, Inc. Boulder, CO, United States)
Barnes, G.
(Northwest Research Associates, Inc. Boulder, CO, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2008
Publication Information
Publication: Solar Physics
Volume: 247
Subject Category
Solar Physics
Funding Number(s)
CONTRACT_GRANT: NNH05CC75C
Distribution Limits
Public
Copyright
Other

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