Computer Science
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985svmf.nasa..121l&link_type=abstract
In NASA. Marshall Space Flight Center Meas. of Solar Vector Magnetic Fields p 121-140 (SEE N85-29869 18-92)
Computer Science
9
Coherent Scattering, Magnetic Fields, Polarization (Charge Separation), Larmor Precession, Line Spectra, Magnetization, Oscillators, Quantum Mechanics
Scientific paper
The Hanle effect is the modification by a local magnetic field of the polarization due to coherent scattering in spectral lines. It results from the precession of a classical oscillator about the magnetic field direction. The sophisticated quantum-mechanical treatment, which is required to compute the polarization parameters of scattered light, was developed. The main features of the Hanle effect concerning magnetic field measurements are: (1) a good sensitivity within the approximate range 0.1 B gamma rho to 10 B gamma rho where B gamma rho is the field strength yielding a Larmor period equal to the radiative lifetime, (2) there is no Hanle effect for field vectors parallel to the excitating beam, (3) the Hanle effect refers essentially to the linear polarization in a spectral line, (4) various points in the line profile are affected in the same way by change of linear polarization so that polarization parameters can be measured on the integrated line profile.
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