Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...247..556k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 247, no. 2, July 1991, p. 556-564.
Astronomy and Astrophysics
Astrophysics
21
Astronomical Spectroscopy, Fine Structure, Line Spectra, Magnetic Flux, Solar Atmosphere, Solar Spectra, Astronomical Photography, Atmospheric Models, Radiative Transfer, Spatial Resolution
Scientific paper
The analysis of a photographic spectrogram of the plage region near the disk center of the sun is undertaken to study small-scale magnetic features with special attention given to the structure of fluxtubes, and a related model is developed. Line-gap regions are identified in the Fe-I line which are characterized by redshifts and fluctuation velocity as well as an asymmetric profile indicative of a direct relationship between increasing downflow and increasing depth. The observations are compared to calculated line profiles in which a magnetic tube under certain conditions is present. The pressure and density are calculated for the tube under the assumption of hydrostatic equilibrium, and the observed intensity profiles can be reproduced when the correct parameters are used. The calculations demonstrate that a strong kilogauss magnetic field can be introduced to explain the line gap in the Fe-II 6149-A line.
Kneer Franz
von Uexkuell M.
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