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Title:
The validity of ionization equilibrium in highly ionized astrophysical plasmas
Authors:
Joselyn, J. A.; Munro, R. H.; Holzer, T. E.
Affiliation:
AA(NOAA, Space Environment Laboratory, Boulder, Colo.), AB(High Altitude Observatory, Boulder, Colo.), AC(High Altitude Observatory, Boulder, Colo.)
Publication:
Astrophysical Journal Supplement Series, vol. 40, Aug. 1979, p. 793-813. (ApJS Homepage)
Publication Date:
08/1979
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Dense Plasmas, Ionization, Magnetohydrodynamic Flow, Thermodynamic Equilibrium, Astrophysics, Carbon, Graphs (Charts), Ion Temperature, Iron, Magnesium, Nitrogen Ions, Oxygen Ions, Silicon, Steady Flow, Stellar Atmospheres, Sulfur, Temperature Gradients
DOI:
10.1086/190604
Bibliographic Code:
1979ApJS...40..793J

Abstract

Conditions of steady flow through a temperature gradient are determined for which the assumption of ionization equilibrium remains approximately valid. A simplified solution for ionization stage densities is obtained for the set of mass conservation equations under conditions of steady flow through a temperature gradient for the following elements and ionization stages: C II through C VII, N III through N VIII, O I through O IX, Ne I through Ne XI, Mg II through Mg XII, Si I through Si XIV, S I through S X, and Fe VI through Fe XVII. The results obtained show that some ions may reflect conditions appropriate to ionization equilibrium, but ionization equilibrium may be a very poor assumption for other ions.

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