Stokes polarization profiles of the Mg b2 5172.68 A 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 mA redward of the line center to 200 mA blueward, in steps of 10 mA. 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 b2 line for the transverse component of the magnetic field.

Calibration of Vector Magnetograms with the Chromospheric Mg b2 Line

Solar Speckle Imaging with a CCD Camera

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Solar Speckle Imaging with a CCD Camera