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Dielectronic Satellite Spectra in the Soft X-Ray Region

Published online by Cambridge University Press:  12 April 2016

A.H. Gabriel
A.H. Gabriel*
Affiliation:
Astrophysics Research Unit, Culham Laboratory, Abingdon, Berks., England

Abstract

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Satellite lines, situated on the long wavelength side of the helium-like ion resonance line, can be observed in highly-ionized ions both in laboratory sources and from the Sun. Although seen for more than 30 years, these lines have only recently been classified in detail as inner-shell transitions in lithium-like ions. Laboratory experiments have shown that under steady-state conditions these satellites are produced by dielectronic recombination, although in transient ionizing plasmas direct inner-shell excitation can be important. Detailed calculations have been carried out for high Z ions up to copper, and the results can be compared with solar flare spectra in iron. Such comparisons allow both the electron temperature and the transient state of the plasma to be determined. Laboratory spectra from such high-Z ions are different in appearance, and may be dominated by processes resulting from the transient ionizing state of the plasma.

Type
Section IV / The Solar Soft X-Ray Spectrum
Information
International Astronomical Union Colloquium , Volume 14: Special Issue: Ultraviolet and X-Ray Spectroscopy of Astrophysical and Laboratory Plasmas , November 1972 , pp. 655 - 664
Copyright
Copyright © Reidel 1972

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