Magnetic shear-based removal of the 180-deg ambiguity in the observed transverse photospheric magnetic field - Feasibility and limitations

Details Magnetic shear-based removal of the 180-deg ambiguity in the observed transverse photospheric magnetic field - Feasibility and limitations Magnetic shear-based removal of the 180-deg ambiguity in the observed transverse photospheric magnetic field - Feasibility and limitations

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265..296c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 1, p. 296-307.

Astronomy and Astrophysics

Astrophysics

21

Magnetic Field Configurations, Photosphere, Solar Magnetic Field, Force-Free Magnetic Fields, Solar Corona

Scientific paper

Results of a systematic investigation of the reliability of the magnetic shear-based method for the removal of the 180-deg ambiguity in the observed transverse photospheric magnetic field are presented. The method consists of the evaluation of the azimuth angle between the observed transverse field component and that of a potential field, calculated by using the line-of-sight component as the boundary condition for the field normal to the image plane. A variety of the force-free field (FFF) magnetic configurations is considered. This includes the cases of relatively weakly and strongly space-dependent fields, relatively small and large maximal values of the FFF-function alpha(r), and same-sign and space-changing sign alpha(r) functions. The 'logical' and 'global' success of the method in removing the 180-deg ambiguity for the 20 cases studied is presented and discussed.

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