Hanle Effect of Weak Solar Magnetic Fields

Details Hanle Effect of Weak Solar Magnetic Fields Hanle Effect of Weak Solar Magnetic Fields

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aspc..205..156f&link_type=abstract

Last Total Solar Eclipse of the Millennium, ASP Conference Series, Vol. 205. Edited by W. Livingston and A. Özgüç. ISBN: 1-58

Physics

Scientific paper

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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