Potential models of the unipolar sunspot magnetic field

Details Potential models of the unipolar sunspot magnetic field Potential models of the unipolar sunspot magnetic field

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...81..217d&link_type=abstract

Solar Physics, vol. 81, Dec. 1982, p. 217-229.

Physics

2

Magnetic Poles, Solar Magnetic Field, Stellar Models, Sunspots, Calcium, H Alpha Line, Iron, Magnetic Field Configurations, Magnetic Flux, Magnetic Measurement, Magnetic Signatures, Spectral Energy Distribution

Scientific paper

The potential models of the unipolar sunspot magnetic field are calculated on the basis of magnetographic measurements of the magnetic field made in the three spectral lines of different intensities, H-alpha, Ca I 6103 A and Fe I 4808 A. The computed distributions of the magnetic field vector are compared with actual distributions observed at these three levels. It is shown that the electric current density in the spot reaches values up to 100,000 CGSE in the volume contained between formation depths of two pairs of lines, Fe I 4808 A-Ca I 6103 A and Fe I 4808 A-H-alpha. Therefore, the magnetic field of the spot deviates strongly from a potential configuration. To the contrary, at higher levels, in the semiinfinite volume restricted at the bottom by the hydrogen H-alpha line, the field appears to be quite close to a potential one.

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