Line formation in microturbulent magnetic fields

Details Line formation in microturbulent magnetic fields Line formation in microturbulent magnetic fields

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ap%26ss..66...47d&link_type=abstract

Astrophysics and Space Science, vol. 66, no. 1, Nov. 1979, p. 47-75.

Astronomy and Astrophysics

Astrophysics

11

Astronomical Spectroscopy, Line Spectra, Magnetic Effects, Stellar Magnetic Fields, Turbulence, Zeeman Effect, Absorptivity, Anisotropy, Circular Polarization, Electromagnetic Absorption, Linear Polarization, Polarized Light, Stellar Spectra, Stokes Law Of Radiation

Scientific paper

The paper considers the formation of Zeeman lines in Gaussian microturbulent magnetic fields assuming LTE. General formulae are derived for the local mean values of the transfer matrix elements, and the cases of one-dimensional, isotropic, and two-dimensional magnetic microturbulence are studied. Characteristic effects of magnetic microturbulence on the transfer coefficients are: (1) the broadening of the frequency contours, (2) the appearance of a pseudo-Zeeman structure for nonlongitudinal magnetic microturbulence, (3) the reduction of maximal values of circular polarization, and (4) the appearance of characteristic linear polarization effects due to the anisotropy of the magnetic microturbulence. It is shown that magnetic intensification due to microturbulent magnetic fields may be more efficient than that due to regular fields, and that for saturated lines the gravity center distance of a Zeeman line depends on the magnetic microturbulence and its anisotropy.

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