Abstract
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. Our scheme is valid for linear problems, and is applicable to solve closely coupled equations of time-dependent problems. As an example, we calculate emission spectra (1–160 A) in the transient phase of ionization under interstellar conditions applicable to a shock-heated plasma. Our results are useful for an analysis of the spectra from tenuous ionizing plasmas-such as supernova remnants.
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