Calibration of Vector Magnetogram with the Nonlinear Least-squares Fitting Technique

Details Calibration of Vector Magnetogram with the Nonlinear Least-squares Fitting Technique Calibration of Vector Magnetogram with the Nonlinear Least-squares Fitting Technique

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004chjaa...4..365s&link_type=abstract

Chinese Journal of Astronomy & Astrophysics, Vol. 4, p. 365-376

Astronomy and Astrophysics

Astrophysics

11

Sun: Activity, Sun: Magnetic Fields, Sunspots

Scientific paper

To acquire Stokes profiles from observations of a simple sunspot with the Video Vector Magnetograph at Huairou Solar Observing Station (HSOS), we scanned the FeI λ 5324.19 Å line over the wavelength interval from 150 mÅ redward of the line center to 150 mÅ blueward, in steps of 10 mÅ. With the technique of analytic inversion of Stokes profiles via nonlinear least-squares, we present the calibration coefficients for the HSOS vector magnetic magnetogram. We obtained the theoretical calibration error with linear expressions derived from the Unno-Becker equation under weak-field approximation.

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