Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ssrv...29..391b&link_type=abstract
(Schweizerische Naturforschende Gesellschaft and EidgenUeossische Technische Hochschule ZUeurich, Conference on Solar Physics fr
Astronomy and Astrophysics
Astrophysics
3
Coherent Scattering, Line Spectra, Prominences, Quantum Theory, Solar Magnetic Field, Wave Functions, Approximation, Astrophysics, Solar Corona, Ultraviolet Spectra, Zeeman Effect
Scientific paper
The Hanle effect is the modification of the linear polarization parameters of a spectral line by the local magnetic field. It can be calculated by considering the coherence effects in radiative scattering caused by interference in the wave functions of the partially overlapping sublevels. The classical theory of the Hanle effect is reviewed, its quantum theory is outlined, and the conditions for which the underlying approximations are valid are discussed. An interpretation method in terms of magnetic-field vector diagnostics, based on a work by Brommier et al. (1981), is described. Finally, the advantages of the Hanle-effect method and the usual Zeeman-effect method are compared. The possibility of extending the Hanle-effect method to magnetic-field diagnostics in the solar corona by using UV lines is discussed
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