The parameters of sensitivity of Fraunhofer lines to the temperature gas pressure and microturbulent velocity

Details The parameters of sensitivity of Fraunhofer lines to the temperature gas pressure and microturbulent velocity The parameters of sensitivity of Fraunhofer lines to the temperature gas pressure and microturbulent velocity

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993kfnt....9...27s&link_type=abstract

Kinematika i Fizika Nebesnykh Tel, vol. 9, no. 5, p. 27-43.

Physics

6

Sun: Photosphere, Spectral Line: Formation

Scientific paper

The parameters are proposed for measuring the sensitivity of Fraunhofer lines to the physical conditions in the solar atmosphere. The parameters are calculated using depression response functions, in LTE approximation. The line sensitivity to the temperature, gas pressure and microturbulent velocity depending on the line parameters and atomic parameters is investigated. The most relatively sensitive to the temperature are weak lines and the most absolutely sensitive are moderate lines of abundant heavy atoms with low ionization and excitation potentials. The potential and the line strength are the main factors of the line temperature sensitivity. The most sensitive to the gas pressure are the medium-strong lines of light atoms with very high excitation potentials (larger than 6 eV) and the most sensitive to the microturbulent velocity are strong photospheric lines (8 pm < W < 14 pm) of heavy atoms. The parameters of sensitivity are useful also for physical diagnostics of the photosphere if fluctuations of the temperature, gas pressure and of microturbulent velocity do not exceed 8%, 50%, and 100 % respectively.

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