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A probabilistic approach to radiative energy loss calculations for optically thick atmospheres - Hydrogen lines and continuaAn approximate probabilistic radiative transfer equation and the statistical equilibrium equations are simultaneously solved for a model hydrogen atom consisting of three bound levels and ionization continuum. The transfer equation for L-alpha, L-beta, H-alpha, and the Lyman continuum is explicitly solved assuming complete redistribution. The accuracy of this approach is tested by comparing source functions and radiative loss rates to values obtained with a method that solves the exact transfer equation. Two recent model solar-flare chromospheres are used for this test. It is shown that for the test atmospheres the probabilistic method gives values of the radiative loss rate that are characteristically good to a factor of 2. The advantage of this probabilistic approach is that it retains a description of the dominant physical processes of radiative transfer in the complete redistribution case, yet it achieves a major reduction in computational requirements.
Document ID
19800068213
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Canfield, R. C.
(California Univ. La Jolla, CA, United States)
Ricchiazzi, P. J.
(California, University La Jolla, Calif., United States)
Date Acquired
August 10, 2013
Publication Date
August 1, 1980
Publication Information
Publication: Astrophysical Journal
Subject Category
Astrophysics
Accession Number
80A52383
Funding Number(s)
CONTRACT_GRANT: AF-AFOSR-76-3071
CONTRACT_GRANT: NSG-7406
Distribution Limits
Public
Copyright
Other

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