Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984baicz..35..308b&link_type=abstract
Bulletin of the Astronomical Institute of Czechoslovakia, vol. 35, p.308
Astronomy and Astrophysics
Astronomy
2
Scientific paper
A new vector magnetograph now in operation permits measurements of polarization of 0.0005 and thus requires precautions to be taken with respect to the instrumental polarization caused by the mirrors of tower telescopes. The author carried out measurements of the instrumental polarization in the meridian position of the coelostat. In the channels for the transverse magnetic field he obtained signals as strong as from magnetic fields of 2000 G. As a first precaution, the author introduced compensation by means of a tilted glass plate. He took further precautions by searching for optimum azimuth angles of the auxiliary coelostat mirror which provide less instrumental polarization. The results have shown that for each hour angle an auxiliary azimuth exists, where one of the three components of instrumental polarization, caused by intensity crosstalk, is zero. This offers the possibility to diminish the two linear components or to eliminate the circular component.
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