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Non-LTE line formation in a magnetic field

โœ Scribed by H. Domke; J. Staude

Publisher
Springer
Year
1973
Tongue
English
Weight
369 KB
Volume
31
Category
Article
ISSN
0038-0938

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โœฆ Synopsis

Theoretical line contours calculated for fixed values of the line constants and a given model atmosphere show an increase of the Stokes parameters Q, U, and V but a decrease of I if the portion of non-coherent scattering increases. These effects increase from the centre of the solar disk to the limb. The action of scattering may be approximately simulated in LTE contours by increasing the gradient of the source function and fitting in this way theoretical contours to observed ones. There remains, however, the effect of V-reversal near the line core, which is caused by anomalous dispersion and is abnormally increased by scattering.

๐Ÿ“œ SIMILAR VOLUMES

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โœ H. Domke; J. Staude ๐Ÿ“‚ Article ๐Ÿ“… 1973 ๐Ÿ› Springer ๐ŸŒ English โš– 451 KB

The formation of a Zeeman-multiplet by noncoherent scattering and true absorption in a Milne-Eddington atmosphere is considered assuming a homogeneous magnetic field and complete depolarization of the atomic line levels. The transfer equation for the Stokes parameters is transformed into a scalar in

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The transfer equations for the Stokes parameters in the presence of magnetic field and under the hypothesis of LTE are derived in an original way by the use of density matrix techniques. The results are substantially the same as those previously obtained by other authors. We finally compare our res