Calibration of a full-disc longitudinal magnetogram at the Huairou Solar Observing Station

Details Calibration of a full-disc longitudinal magnetogram at the Huairou Solar Observing Station Calibration of a full-disc longitudinal magnetogram at the Huairou Solar Observing Station

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mnras.406.1166w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 406, Issue 2, pp. 1166-1176.

Astronomy and Astrophysics

Astronomy

1

Techniques: Polarimetric, Sun: Photosphere, Sun: Surface Magnetism

Scientific paper

Based on a spectral profile analysis of a filter magnetograph and the application of the astronomical data analysis technique, a full-disc distribution of Stokes I-to-V crosstalk in the solar magnetism and activity telescope (SMAT) has been acquired quantitatively. We produce a correction template to remove the full-disc Stokes I-to-V crosstalk. This template is important for the accuracy of the full-disc longitudinal magnetogram. Then, we propose an observational calibration method under the weak-field approximation on the basis of the scanning spectrum of the filter magnetograph. The following main results have been obtained. (i) For the original Stokes V images, there is about -1.67 × 10-3 of Stokes I crosstalk into V at all wavelength positions, and this crosstalk presents itself as a horse-saddle surface distribution on the full disc. (ii) A sample of the calibration curve at different wavelength positions is given. (iii) After being calibrated into magnetic flux density, the Stokes I-to-V crosstalk has an amplitude of about 50 G, but introduces negative and positive spurious magnetic fields into the blue and red wing magnetograms, respectively.

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