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Ten Years of the Okayama Vector Magnetograph

Published online by Cambridge University Press:  12 April 2016

Mitsugu Makita ,
Takashi Sakurai ,
Kiyoto Shibasaki  and
Hisashi Koyano
Mitsugu Makita
Affiliation:
Kwasan Observatory, Kyoto University, Yamashina, Kyoto 607, Japan
Takashi Sakurai
Affiliation:
Solar Physics Division, National Astronomical Observatory, Mitaka, Tokyo 181, Japan
Kiyoto Shibasaki
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory, Minamimaki, Minamisaku, Nagano 384-13, Japan
Hisashi Koyano
Affiliation:
Okayama Astrophysical Observatory, National Astronomical Observatory, Kamogata, Okayama 719-02, Japan

Extract

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The vector magnetograph of the Okayama Astrophysical Observatory (Makita et al. 1985a,c) is equipped on the 65cm solar coude telescope with the 10m Littrow spectrograph. Results of observations are vector magnetograms, velocitygrams, maps of the broadband polarizations, maps of the magnetic lines of force, and maps of the electric currents. Their examples are given in figure 1. The data books, which give the vector magnetograms, have been published every year since 1983.

Calibrations of the polarization degree and the overall accuracy were discussed (Makita et al. 1982, 1987; Makita and Li 1992). The accuracy of the polarization measurement is 10−3for the line observation and 10−4 for the continuum observation. Conversion of the polarization degrees to the magnetic field vector has been tried by Sakurai (1987) with the use of the weak field theory and the observed magnetic field strength of sunspots. A simultaneous observation of the same active region was once made with the Sayan Observatory (Makita et al. 1985b). Distributions of the magnetic polarity were quite similar and azimuths of the magnetic field agreed very well.

Type
Session 3. Techniques of Magnetic Field Measurements
Information
International Astronomical Union Colloquium , Volume 141: The Magnetic and Velocity Fields of Solar Active Regions , 1993 , pp. 180 - 183
Copyright
Copyright © Astronomical Society of the Pacific 1993

References

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