THE DIAGNOSTICS OF ASTROPHYSICAL PLASMAS, USING THE OXYGEN VII SOFT X-RAY LINESReport as inadecuate




THE DIAGNOSTICS OF ASTROPHYSICAL PLASMAS, USING THE OXYGEN VII SOFT X-RAY LINES - Download this document for free, or read online. Document in PDF available to download.



Abstract : We present 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 during solar flares, as well as in an attempt to understand the spectrum of the Puppis À supernova remnant. In order to explain the strange intensity ratios observed from Puppis À, previous authors have proposed an interpretation based upon a high temperature thermal plasma >5 106 K, in a non-equilibrium ionisation state. We present here an alternative model, based upon the assumed presence of a proportion of fast non-thermal electrons imbedded in an otherwise thermal plasma at a temperature of below 1 106 K. This can adequately explain the observations, without the necessity of invoking departures from ionisation balance.





Author: A. Gabriel F. Bely-Dubau P. Faucher L. Acton

Source: https://hal.archives-ouvertes.fr/



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