Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....70..789f&link_type=abstract
Astronomy and Astrophysics, vol. 70, no. 6, Dec. 1978, p. 789-799. Research supported by the Aerospace Corp.
Astronomy and Astrophysics
Astrophysics
41
Brightness, Faculae, Radial Velocity, Solar Magnetic Field, Solar Spectra, Atmospheric Models, Iron, Line Spectra, Magnetic Flux, Signal To Noise Ratios, Solar Activity, Solar Limb
Scientific paper
To investigate the magnetic, velocity, and brightness structure of solar magnetic elements in active region plages, the line-ratio technique of Stenflo (1973) was applied by making simultaneous magnetograph recordings in the two Fe I lines at 525.0 and 524.7 nm. Not only the B(525.0)/B(524.7) ratio but also the brightness-magnetic field and velocity-magnetic field correlations were studied. The center-to-limb variations of the parameters were also observed. The data were analyzed in terms of a Milne-Eddington model atmosphere. The cross section of the magnetic field was found to be narrower than the associated velocity profile. The continuum contrast at disk center had an amplitude of as much as 18%, which indicates that the heating starts at relatively large optical depths, with temperature excess increasing rapidly with height to account for the strong intensity enhancement in the line core. With the M-E model, however, it was not possible to obtain a fully consistent fit with all data at the same time. One needs a multidimensional, time-dependent non-LTE model for the transfer of polarized light in rapidly evolving small-scale magnetic geometries
Frazier Edward N.
Stenflo Jan Olof
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