Non LTE radiation processes: application to the solar corona
Abstract
Description
These lectures are intended to present a simple but relatively complete description of the theory needed to understand the formation of lines in non-local thermodynamical equilibrium (NLTE), without appealing to any previous knowledge except a few basics of physics and spectroscopy. After recalling elementary notions of radiation transfer, the chapter is focussed on the computation of the level populations, the source function, the ionization state, and finally the line intensity. An application is made to forbidden coronal lines which were observed during eclipses since decades.
30 pages, 10 figures, in "Advances in Solar Resaearch at Eclipses from Ground and from Space", Eds. J-P. Zahn and M. Stavinschi, Nato Science Series
30 pages, 10 figures, in "Advances in Solar Resaearch at Eclipses from Ground and from Space", Eds. J-P. Zahn and M. Stavinschi, Nato Science Series