Excitation of Hydrogen and Ca II Under Chromospheric Conditions
Open Access
- 1 January 1967
- journal article
- research article
- Published by CSIRO Publishing in Australian Journal of Physics
- Vol. 20 (1) , 81-100
- https://doi.org/10.1071/ph670081
Abstract
Methods are described for calculating excitation conditions in a hot gas in the absence of local thermodynamic equilibrium, taking self-absorption into account, in the approximation that excitation is uniform throughout the medium. The equilibrium excited-state populations and the emission, attenuation, and scattering properties derived from them are tabulated for a variety of physical conditions appropriate to the -solar chromosphere (7500 < T < 50000oK; 1010 < N e < 1012 cm-3) for some of the main spectral lines of hydrogen and CalI.Keywords
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