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The Hanle effect is a reduction in the polarization of light when the atoms emitting the light are subject to a magnetic field in a particular direction, and when they have themselves been excited by polarized light. It is named after Wilhelm Hanle, who first described it in ''Zeitschrift für Physik'' in 1924. Attempts to understand the phenomenon were important in the subsequent development of quantum physics. ==Applications== * Observation of the Hanle effect on the light emitted by the sun is used to indirectly measure the magnetic fields within the sun, see: * * Polarization in astronomy * * Imaging spectroscopy 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hanle effect」の詳細全文を読む スポンサード リンク
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