Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.5304c&link_type=abstract
American Astronomical Society Meeting 210, #53.04; Bulletin of the American Astronomical Society, Vol. 39, p.164
Astronomy and Astrophysics
Astronomy
Scientific paper
We employ the divergence-free property of magnetic fields to resolve the azimuthal ambiguity in solar vector magnetograms. We show that the ambiguity can be resolved away from disk centre if one knows the line-of-sight derivative of the magnetic field components in the directions parallel and transverse to the line-of-sight. However, knowing only the line-of-sight derivative of the line-of-sight component of the magnetic field is not sufficient except at disk centre. Thus, multi-height vector magnetogram data can be used to resolve the ambiguity provided that all the line-of-sight derivatives can be determined reliably. We use a simple theoretical example, consisting of two submerged magnetic point sources, to demonstrate our findings. This work was supported by funding from NASA/LWS under contract NNH05CC75C.
Barnes Graham
Crouch Ashley D.
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