Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...173..167s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 173, no. 1, Feb. 1987, p. 167-179.
Astronomy and Astrophysics
Astrophysics
50
Infrared Spectra, Iron, Line Spectra, Magnetic Flux, Solar Magnetic Field, Fourier Transformation, Stokes Law Of Radiation, Zeeman Effect
Scientific paper
Fourier Transform Spectrometer recordings of May 1984 have been used to explore the center-to-limb variation of the Stokes I, V, and Q profiles of the solar infrared Fe I line at 15,648.54 A. The aim is to examine the new possibilities offerred for the diagnostics of the spatially unresolved magnetic flux tubes on the sun when lines with complete Zeeman splitting are used. Comparison is made with the line-ratio method, which must be used at visible wavelengths, where the splitting is incomplete. The Stokes V asymmetries observed in the infrared line are small or even of opposite sign as compared with the corresponding asymmetries observed at visible wavelengths. This suggests that the time-averaged height gradient of the Doppler velocities inside the fluxtubes becomes small and may change its sign when moving down to the bottom of the fluxtube photosphere.
Harvey Jack W.
Solanki Sami K.
Stenflo Jan Olof
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