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Resolving Azimuth Ambiguity Using Vertical Nature of Solar Quiet-Sun Magnetic Fields View all abstracts by submitter

Sanjay Gusain   Submitted: 2012-10-24 15:04

The measurement of solar magnetic fields using the Zeeman effect diagnostics has a fundamental 180◦ ambiguity in the determination of the azimuth angle of the transverse field component. There are several methods that are used in the community and each one has its merits and demerits. Here we present a disambiguation idea that is based on the assumption that most of the magnetic field on the sun is predominantly vertical. While the method is not applicable to penumbra or other features harboring predominantly horizontal fields like the sheared neutral lines, it is useful for regions where fields are predominantly vertical like network and plage areas. The method is tested with the full-disk solar vector magnetograms observed by the VSM/SOLIS instrument. We find that statistically about 60?85 % of the pixels in a typical full-disk magnetogram has field inclination in the range of 0◦?30◦ with respect to the local solar normal, and thus can be successfully disambiguated by the proposed method. Due to its non-iterative nature, the present method is extremely fast and therefore can be used as a good initial guess for iterative schemes like nonpotential field computation (NPFC) method. Furthermore, the method is insensitive to noisy pixels as it does not depend upon the neighboring pixels or derivatives.

Authors: Sanjay Gosain and Alexei A. Pevtsov
Projects: National Solar Observatory (Sac Peak)

Publication Status: Accepted in Solar Physics
Last Modified: 2012-10-26 14:54
Go to main E-Print page  Measurements of electron anisotropy in solar flares using albedo with RHESSI X-ray data.  A MULTI-SPACECRAFT VIEW OF A GIANT FILAMENT ERUPTION DURING 26/27 SEPTEMBER 2009  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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