Hanle effect

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The rotation of the plane of polarization of spectral lines due to a magnetic field. The Hanle effect has been used to measure the weak magnetic fields of solar prominences, which are found to be 10−3 tesla, or up to 10−2 tesla for active prominences. It is named after the German physicist Wilhelm Hanle (1901–93).

Subjects: Astronomy and Astrophysics.

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