Other
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....91..202f&link_type=abstract
Astronomy and Astrophysics, vol. 91, no. 1-2, Nov. 1980, p. 202-211.
Other
5
Atmospheric Turbulence, Flow Velocity, Nonequilibrium Thermodynamics, Spectral Line Width, Stellar Atmospheres, Absorption Spectra, Chromosphere, Isothermal Processes, Radiative Transfer, Stochastic Processes
Scientific paper
Profiles of non-LTE lines broadened by a turbulent velocity field with a finite correlation length are computed by the 'effective source function' technique. This method can reformulate stochastic transfer as a standard non-LTE problem with an effective escape probability determined by averaging all realizations of velocity fields. Effective source functions and mean emergent profiles were calculated for a two-level atom with two choices of a thermal source, and choices between the Doppler and Voigt line profiles. It is concluded from correlations between the macroturbulent limit, the thermalization length, and variations of emergent profiles in isothermal and chromospheric atmospheres, that a micro-macroturbulent model cannot reproduce a turbulent velocity field with a finite correlation length.
Frisch Henry
Froeschlé Ch.
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