X-ray emission spectra from ionizing plasmas

Effects of non-equilibrium ionization on emission spectra are studied. Ionization rate equations are solved with the eigenvalue-method to avoid a numerical instability near the equilibrium and also to save time of computations. The scheme is valid for linear problems and is applicable to solve close...

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Bibliographic Details
Published in:Astrophysics and space science 1984, Vol.98 (2), p.367-395
Main Author: MASAI, K
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
Fundamental aspects of astrophysics
Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations
Magnetohydrodynamics and plasmas
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Summary:Effects of non-equilibrium ionization on emission spectra are studied. Ionization rate equations are solved with the eigenvalue-method to avoid a numerical instability near the equilibrium and also to save time of computations. The scheme is valid for linear problems and is applicable to solve closely coupled equations of time-dependent problems. As an example, emission spectra (1-160 A) are calculated in the transient phase of ionization under interstellar conditions applicable to a shock-heated plasma. The results are useful for an analysis of the spectra from tenuous ionizing plasmas such as supernova remnants.
ISSN:0004-640X
1572-946X
DOI:10.1007/bf00651415