Nonlinear Least-Squares Analysis of Stokes Profiles

Details Nonlinear Least-Squares Analysis of Stokes Profiles Nonlinear Least-Squares Analysis of Stokes Profiles

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005soph..226...17c&link_type=abstract

Solar Physics, Volume 226, Issue 1, pp.17-36

Physics

Scientific paper

We describe improvements to the calibration and analysis of Fe I 6302.5 Å data from the San Fernando Observatory Video Spectra-Spectroheliograph (SFO-VSSHG). A more effective flat field is generated and the scales of the simultaneous Stokes measurements are made equal. Analysis of Stokes profiles is carried out using a moments technique but applied to nonlinear least-squares fits to the data. Typical spectropolarimetric results from the old and new methods are compared and discussed. Finally, we present asymmetry maps, a zero-crossing map, and a “relative-split” map extracted from the fits to the Stokes V profiles.

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