Other
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...378..438g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 378, Sept. 1, 1991, p. 438-444. Research supported by Lockheed Corp.
Other
13
Atomic Structure, Oxygen Spectra, Solar Spectra, Supernova Remnants, X Ray Spectra, Atomic Energy Levels, Emission Spectra, Line Spectra, Solar Flares, Space Plasmas, Spin-Orbit Interactions
Scientific paper
The paper presents a revised theory and atomic model for the line intensities emitted by O VII, taking into account all of the processes responsible for the emission. This is used to provide a revision of the density measurements made for solar active regions and during flares, as well as an attempt to understand the spectrum of the Puppis A supernova remnant. In order to explain the strange intensity ratios observed from Puppis A, previous authors have proposed an interpretation based upon a high-temperature thermal plasma in a nonequilibrium ionization state. An alternative model is presented here, based upon the assumed presence of a proportion of fast, nonthermal electrons imbedded in an otherwise thermal plasma at a temperature below 10 to the 6th K. This can adequately explain the observations without the necessity of invoking departures from the ionization balance.
Acton Loren W.
Bely-Dubau Francoise
Faucher P.
Gabriel Alan H.
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