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- Title
Calibration of Vector Magnetograms with the Chromospheric Mg b Line.
- Authors
Bai, X.; Deng, Y.; Su, J.
- Abstract
Stokes polarization profiles of the Mg b 5172.68 Å spectral line on two simple sunspots are obtained with the Multi-Channel Solar Telescope (MCST) at the Huairou Solar Observing Station (HSOS). This is done by means of scanning this line over the wavelength interval from 200 mÅ redward of the line center to 200 mÅ blueward, in steps of 10 mÅ. A generalized analytic solution to the transfer equation for polarized radiation is presented. With a nonlinear least-square fitting technique, the linear calibration coefficients for the low-chromospheric longitudinal magnetic field is obtained in the weak-field case. We also discuss the problems in calibrating the transverse field with this line. It is shown that the weak-field approximation is not applicable to the chromospheric Mg b line for the transverse component of the magnetic field.
- Subjects
CALIBRATION; VECTORS (Calculus); SOLAR chromosphere; MAGNESIUM; POLARIZATION (Nuclear physics); SUNSPOTS spectra; SPECTRAL line formation; SOLAR telescopes; ASTRONOMICAL observations
- Publication
Solar Physics, 2013, Vol 282, Issue 2, p405
- ISSN
0038-0938
- Publication type
Article
- DOI
10.1007/s11207-012-0197-0