A non-local-thermodynamic equilibrium formulation of the transport equation for polarized light in the presence of weak magnetic fields

Physics

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Polarized Light, Radiative Transfer, Solar Magnetic Field, Thermodynamic Equilibrium, Equations Of Motion, Light Transmission, Quantum Theory

Scientific paper

The changes in polarization, and therefore in the Stokes parameters, due to the transport of a beam through an optically thick medium in a weak magnetic field are considered. The transport equation is derived from a general density matrix equation of motion. This allows the possibility of interference effects arising from the mixing of atomic sublevels in a weak magnetic field to be taken into account. The statistical equilibrium equations are similarly derived. Finally the coupled system of equations is presented and the order of magnitude of the interference effects shown. Collisional effects are not considered. The magnitude of the interference effects in magnetic field measurements of the sun may be evaluated.

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