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Paper: Hanle Effect of Weak Solar Magnetic Fields
Volume: 205, The Last Total Solar Eclipse of the Millennium in Turkey
Page: 156
Authors: Faurobert, M.
Abstract: The Hanle effect provides a diagnostic tool for weak magnetic fields, which do not give rise to a measurable Zeeman effect, such as turbulent fields or magnetic canopies in the chromosphere. The lines which are sensitive to the Hanle effect are formed under non-LTE conditions by scattering of photons. After a brief description of the physical mechanism at hand, I present some approximate expressions for the linear polarization of such lines in the presence of a weak magnetic field and show how the Hanle effect may be used for the diagnostics of magnetic canopies.
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