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arXiv · 1409.7879

Collisional effects on the formation of the second solar spectrum of the Sr {\sc ii} $\lambda$4078 line

C. Deb·M. Derouich
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Abstract

This work aims to provide key elements to gain better understanding of the formation of the second solar spectrum of the Sr II $\lambda$4078 line. We show that in a certain range of hydrogen density, the effect of isotropic collisions between Sr II ions with hydrogen atoms is important in determining the polarization of the Sr II $\lambda$4078 line. The use of an atomic model that neglects the metastable level 4d of Sr II can induce errors of up to 25 \% in the value of the scattering polarization of the solar Sr II $\lambda$4078 line.

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C. Deb, M. Derouich. 2014-09-28. Collisional effects on the formation of the second solar spectrum of the Sr {\sc ii} $\lambda$4078 line. https://doi.org/10.1051/0004-6361/201424176

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