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Determination of magnetic field direction in a comet's head

Authors:	DA Varshalovich GF Chörny

Institution:	Academy of Sciences of the USSR, A.F. Ioffe Institute of Physics and Technology, Leningrad 194021, USSR

Abstract:	The Stokes parameters of resonance radiation scattered by a Na atom with the angular momentum F aligned by directed unpolarized radiation in a magnetic field H ～ 10^?5?10^?1 Oe are presented. An influence of the orientation of the magnetic field on these parameters are studied; the intensity ratio $I(D_{2}) I(D_{1})$ changes within ±5%, and the polarization degree P(D₂) within ±25%. Measurements of $I(D_{2}) I(D_{1})$ and P(D₂), if the geometry of scattering is known, may give information on the direction of the magnetic field in the sodium atmospheres of comets, as well as Io's sodium cloud or man-made cosmic clouds.

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