Resolving the Azimuthal Ambiguity in Vector Magnetogram Data with the Divergence-Free Condition

Details Resolving the Azimuthal Ambiguity in Vector Magnetogram Data with the Divergence-Free Condition Resolving the Azimuthal Ambiguity in Vector Magnetogram Data with the Divergence-Free Condition

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.0915c&link_type=abstract

American Astronomical Society, SPD meeting #40, #9.15; Bulletin of the American Astronomical Society, Vol. 41, p.819

Astronomy and Astrophysics

Astronomy

Scientific paper

We demonstrate how the divergence-free property of magnetic fields can be exploited to resolve the azimuthal ambiguity that is present in solar vector magnetogram data by using line-of-sight and horizontal heliographic derivative information. Using synthetic data at two heights we objectively test several methods that each make a different assumption about how the divergence-free property can be used to resolve the ambiguity. We investigate how the different approaches respond to various effects, including the presence of noise and limited spatial resolution. This work was supported by funding from NASA under contracts NNH05CC49C/NNH05CC75C and NNH09CE60C.

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