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Hanle effect

Hanle effect. wikipedia. Wilhelm Hanle (1901 - 1993). October 3 rd ,2013 Lunch seminar Tetsu Anan. Chromosphere. Ca II 3933Å Scattering is effective in the line core. Photo- sphere. 10 5. Chromosphere. T (K). 10 4. 10 3. 500. 20 00. Height (km).

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Hanle effect

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  1. Hanle effect wikipedia Wilhelm Hanle (1901 - 1993) October 3rd ,2013 Lunch seminar Tetsu Anan

  2. Chromosphere Ca II 3933Å Scattering is effective in the line core Photo- sphere 105 Chromosphere T (K) 104 103 500 2000 Height (km) Vernazza et al. 1981

  3. Scattering process in spectral line Emission Absorption atom atom Time scale 〜 1/A Incident light Scattered radiation is polarized perpendicular to scattering plane

  4. Hanle effect Ca I 4227Å Rotation and depolarization of the plane of polarization in the line core by B field Intensity − + + B atom − + − Stenflo

  5. Measurement of magnetic fieldby Hanle effect Precession of the oscillator around the B field Q U ωL/A 1 0.1 5 ( =eB/m/c/A )

  6. Summary • Hanle effect is important • to interpret polarization in chromospheric spectral line • to measure magnetic field in chromosphere • Interesting topics in space physics by using the effect • ? • ?

  7. Thank you for your attention

  8. Scattering process in spectral line Deexcitation Absorption upper upper 2 level atom lower lower Time scale of the excited state = 1/A atom atom Unpolarized incident light Scattered radiation is polarized perpendicular to scattering plane

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