Instrumental polarization and phase properties of the ATsU-5 telescope
Abstract
The paper discusses measurements of variations in the degree of instrumental polarization and in the orientation of the plane of polarization in the cited solar telescope; the use of the telescope as a phase plate is also described. Data are presented which show that the degree of polarization from the coelostats varies during the day from a maximum of 2% just after sunrise or before sunset to a minimum of 0.6% around noon. The orientation of the plane of polarization is found to change by plus or minus 60 deg in one day. When used as a phase plate, the telescope transforms linearly polarized light into elliptically polarized light with a semiaxis ratio of 1:25, which corresponds to a phase difference of 40 deg 40 min. It is noted that a gain-phase compensator must be employed when making photographic or photoelectric observations of the solar magnetic fields.
- Publication:
-
Trudy Kazanskaia Gorodkoj Astronomicheskoj Observatorii
- Pub Date:
- 1974
- Bibcode:
- 1974TrKaz..26..164M
- Keywords:
-
- Instrument Compensation;
- Magnetic Measurement;
- Optical Correction Procedure;
- Polarized Light;
- Telescopes;
- Diurnal Variations;
- Elliptical Polarization;
- Magnetic Signatures;
- Optical Depolarization;
- Solar Magnetic Field;
- Zeeman Effect;
- Astronomy