Other
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jphys..49..235g&link_type=abstract
(IAU, ESA, CNRS, et al., Colloquium on UV and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas, 102nd, Beaulieu-sur-Me
Other
2
Cosmic Plasma, Line Spectra, Oxygen Spectra, Supernova Remnants, X Ray Spectra, Atomic Spectra, Emission Spectra, Forbidden Bands, Solar Flares, Thermal Plasmas
Scientific paper
A revised theory and atomic model are presented 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 during solar flares, as well as in 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 (above 5 million K), in a nonequilibrium ionization state. An alternative model, based upon the assumed presence of a proportion of fast nonthermal electrons imbedded in an otherwise thermal plasma at a temperature of below 1 million K, is presented. This can adequately explain the observations, without the necessity of invoking departures from ionization balance.
Acton Loren W.
Bely-Dubau Francoise
Faucher P.
Gabriel Alan H.
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