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Temperature and Optical Depth Dependence of 0 VII Line Ratios with Reference to Solar Coronal Observations

Published online by Cambridge University Press:  25 September 2017

L.W. Acton ,
W.A. Brown ,
K.T. Strong  and
R.C. Catura
L.W. Acton
Affiliation:
Lockheed Research Laboratory, 3251 Hanover Street, Palo Alto California 94304, U.S.A.
W.A. Brown
Affiliation:
Lockheed Research Laboratory, 3251 Hanover Street, Palo Alto California 94304, U.S.A.
K.T. Strong
Affiliation:
Lockheed Research Laboratory, 3251 Hanover Street, Palo Alto California 94304, U.S.A.
R.C. Catura
Affiliation:
Lockheed Research Laboratory, 3251 Hanover Street, Palo Alto California 94304, U.S.A.

Extract

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The intensity ratio of the sum of forbidden (3S - 1S) and intersystem (3S - 1S) lines to the resonance (1P - 1S) line of helium-like ions can serve as a useful measure of optical depth due to resonance scattering. The temperature dependence of this ratio for a low density, optically thin plasma, is examined in detail for the case of 0 VII. Collisional excitation rates with exchange contributions as well as cascades and the effect of unresolved satellite lines resulting from dielectronic recombination are included. These results are compared to spatially resolved measurements of the solar 0 VII spectrum and the difference interpreted in terms of resonance scattering into or out of the line of sight.

Type
Translation
Information
International Astronomical Union Colloquium , Volume 43: Vth Conference on UV & X-Ray Spectroscopy of Astrophysical & Laboratory Plasmas , July 1977 , pp. 43
Copyright
Copyright © Crown Research Institutes 1977