Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982acasn..23...39a&link_type=abstract
Acta Astronomica Sinica, vol. 23, Mar. 1982, p. 39-48. In Chinese, with abstract in English.
Astronomy and Astrophysics
Astronomy
25
Iodides, Iron Compounds, Line Spectra, Photosphere, Solar Atmosphere, Solar Magnetic Field, Birefringence, Calibrating, Magnetic Effects, Runge-Kutta Method, Telescopes
Scientific paper
The FeI lambda 5324.19 A line forming the magnetic fields of the solar photosphere, penumbra and umbra is computed using the Unno-Beekers equation and the Runge-Kutta method with variable step length. The coefficients of the theoretical calibration for the solar magnetic field and the solar sight line velocity field are computed using the birefringence filter with half width 0.15 A. The coefficients of the theoretical calibration of the longitudinal magnetic field and the sight line velocity field have good linearity and stability as well as moderate sensitivity. The transparent band of the birefringence filter should be placed on 0.1-0.11 A from the line center when the transverse magnetic fields are observed.
Ai Guo-Xiang
Li Wangrong
Zhang Qing-Hong
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