Investigation of the magnetic and temperature sensitivity for the Stokes parameters of absorption lines in the solar photosphere

Details Investigation of the magnetic and temperature sensitivity for the Stokes parameters of absorption lines in the solar photosphere Investigation of the magnetic and temperature sensitivity for the Stokes parameters of absorption lines in the solar photosphere

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995kfnt...11b..25s&link_type=abstract

Kinematika i Fizika Nebesnykh Tel, vol.11, no.2, p. 25-42.

Physics

Sun: Photosphere, Spectral Line: Formation

Scientific paper

The response functions to perturbations in the temperature, pressure, microturbulent velocity, and magnetic field strength have been obtained for the Stokes parameters profiles of Fe I λλ525.06, 525.02, and Fe II 614.92 nm lines. We use the Grossmann-Doerth, Larsson, and Solanki (1988) technique for the numerical solution of the Unno-Rachkovskij transfer equations. An analysis of these functions confirms that they can be used for the quantitative estimation of the response of Stokes profiles and for the determination of the photospheric depth where the changes in physical conditions influence the radiative and absorption processes in the continuum and in the line. The sensitivity of the magnetoactive lines has been analyzed by the sensitivity indicators calculated as the integral of the response function all over photospheric layers. The anomalous temperature sensitivity of the V Stokes profiles has been found for lines with high excitation and ionization potentials, such as O I, C I, Fe II lines. The depression of these lines increases with the temperature. The magnetic sensitivity of the Stokes profiles is determined in the first place by the magnetic field regime. The greatest response takes place in the weak-field and intermediate-field regime for photospheric lines with large values of the Lande factor, wavelength, and equivalent width. The results of calculations of sensitivity indicators and indices of the magnetic and temperature strengthening for magnetoactive lines are presented.

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