Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...258..521f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 258, no. 2, p. 521-534.
Astronomy and Astrophysics
Astrophysics
57
Calcium, Linear Polarization, Metal Ions, Resonant Frequencies, Solar Activity, Solar Spectra, Chromosphere, Line Spectra, Local Thermodynamic Equilibrium, Solar Magnetic Field
Scientific paper
An interpretation is presented of observations of the linear polarization in the resonance line of Ca I at 4227 A over solar active and nonactive regions performed by Stenflo (1982) and Stenflo et al. (1980). Theoretical polarization profiles of the Ca I line are calculated by solving a non-LTE polarized transfer problem with a two-level atom interative method which takes into account partial frequency redistribution and the Hanle effect. For Ca I depolarization is caused by collisions with neutral hydrogen atoms, and the collision rate is determined by gamma(vw), the van der Waals coefficient of neutral calcium. Comparisons of the theoretical line wing polarization with observational data from nonmagnetic regions suggest an empirical value for gamma(vw) which is in agreement with the results of previous theoretical calculations.
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