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Helium emission from model flare layersThe emission of visible and UV He I and He II line radiation from a plane-parallel model flare layer characterized by electron temperatures of 10,000 to 50,000 K and electron densities of 10 to the 10th power to 10 to the 15th power per cu cm is analyzed by solving the statistical-equilibrium equations for a 30-level He I-II-III system, using parametric representations of the line and continuum radiation fields. The atomic model was chosen to provide accurate solutions for the first two resonance lines of He I and He II as well as for the D3 and 10,830-A lines of He I. Reaction rates are discussed, and sample solutions to the steady-state population equations are given for a generally optically thin gas assumed to be irradiated over 2pi sr by a blackbody spectrum at 6000 K. Specific results are examined for ionization equilibrium, level populations, approximate optical depths of a 1000-km-thick flare layer, line intensities, and upper-level population rates.
Document ID
19770038594
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kulander, J. I.
(Lockheed Radiation Physics Laboratory Palo Alto, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
June 1, 1976
Publication Information
Publication: Solar Physics
Volume: 48
Subject Category
Solar Physics
Accession Number
77A21446
Funding Number(s)
CONTRACT_GRANT: NAS8-27988
Distribution Limits
Public
Copyright
Other

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