Measurement of the magnetic vector on the sun at the Okayama Astrophysical Observatory.
Abstract
Observations taken in Japan beginning in 1982 have been used to obtain magnetic vectors on the sun. Investigation of drift curves of the measured polarization shows that the residual instrumental polarization can be represented by trigonometric functions of twice the sun's hour angle. Peak-to-peak amplitudes of fluctuations in the line wing (5250 A) and in the neighboring continuum (5282-5297 A) are 0.0041 and 0.0001 respectively. The observed radial velocity drifts linearly at the rate of about 0.2 to 1 km/s/hr. It is suggested that corrections could give the accuracy of 10 m/s.
- Publication:
-
Liege International Astrophysical Colloquia
- Pub Date:
- 1987
- Bibcode:
- 1987LIACo..27..185M
- Keywords:
-
- Astronomical Observatories;
- Magnetic Measurement;
- Polarimeters;
- Solar Magnetic Field;
- Drift Rate;
- Linear Polarization;
- Magnetic Signatures;
- Photomultiplier Tubes;
- Radial Velocity;
- Sunspots;
- Solar Physics;
- Polarimetry:Sun;
- Solar Magnetic Fields;
- Sun:Polarimetry