Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...263..323r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 263, no. 1-2, p. 323-338.
Astronomy and Astrophysics
Astrophysics
85
Field Strength, Infrared Spectra, Solar Magnetic Field, Astronomical Polarimetry, Solar Atmosphere, Solar Spectra, Thermodynamic Properties, Zeeman Effect
Scientific paper
The diagnostics developed by Zayer et al. 1989 are applied to 27 Stokes V spectra of solar plates. The 1.5 micron lines at 15648 A and 15652 A are used to measure magnetic field strengths between 400 G and 1700 G at z = 0 in active region plages with an accuracy of up to 2-3 percent. The results confirm the accuracy of the line-ratio technique of Stenflo (1973). It is estimated that the fraction of net magnetic flux in strong-field form is close to 90 percent, supporting the view that the small-scale magnetic fields are concentrated very efficiently. The data clearly contradict the claims of Zirin and Popp (1989) based on 12 micron lines that there is at most indirect evidence for kG fields in solar plages. They also contradict the large fraction of weak-field flux reported by Del Toro et al. (1990).
Livingston Willam
Rueedi I.
Solanki Sami K.
Stenflo Jan Olof
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