Solar chromospheric magnetic fields in active regions inferred by monochromatic images of the Stokes' parameter V of the H-beta line

Details Solar chromospheric magnetic fields in active regions inferred by monochromatic images of the Stokes' parameter V of the H-beta line Solar chromospheric magnetic fields in active regions inferred by monochromatic images of the Stokes' parameter V of the H-beta line

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..146...75z&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 146, no. 1, p. 75-92.

Physics

16

Chromosphere, H Beta Line, Magnetic Field Configurations, Magnetic Signatures, Solar Magnetic Field, Circular Polarization, Faculae, Photosphere, Plasma Diagnostics, Solar Activity, Sunspots

Scientific paper

A series of H-beta chromospheric magnetograms was obtained at various wavelengths near the line center with the vector video magnetograph at Huairou Solar Observing Station as a diagnostic of chromospheric magnetic structures. The 2D distribution of the circular polarization light of the H-beta line with its blended lines at various wavelength in active regions was obtained, which consists of the analyses of Stokes' profile V of this line. Due to the disturbance of the photospheric blended line Fe I 4860.98 A for the measurement of the chromospheric magnetic field, a reversal in the chromospheric magnetograms relative to the photospheric ones occurs in the sunspot umbrae. But in the quiet, plage regions, even penumbrae, the influence of the photospheric blended Fe I 4860.98 A line is not obvious. As regards the observation of the H-beta chromospheric magnetograms, we can select the working wavelength between -0.20 and -0.24 A from the line core of H-beta to avoid the wavelengths of the photospheric blended lines in the wing of H-beta. After the spectral analysis of chromospheric magnetograms, we conclude that the distribution of the chromospheric magnetic field is similar to the photospheric field, especially in the umbrae of the sunspots. The chromospheric magnetic field is the result of the extension of the photospheric field.

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