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Identifications of Some Highly-Ionized Iron and Nickel Lines in the 200–400 Å Region of the Solar Spectrum

Published online by Cambridge University Press:  12 April 2016

K. G. Widing ,
G. Sandlin  and
R. Cowan
K. G. Widing
Affiliation:
Code 7144, U.S. Naval Research Laboratory, Washington, D.C. 20390, U.S.A.
G. Sandlin
Affiliation:
Code 7144, U.S. Naval Research Laboratory, Washington, D.C. 20390, U.S.A.
R. Cowan
Affiliation:
Code 7144, U.S. Naval Research Laboratory, Washington, D.C. 20390, U.S.A.

Abstract

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A number of previously unclassified multiplets of FeXIV, XIII, XII, and XI produced by transitions of the type 3s23pn–3s3pn+1 are identified in the XUV spectrum of the Sun. The iron lines account for most of the previously unidentified strong lines between 330 and 370 Å. Solar observations of especial value for the investigation of the 300–400 Å region were the slitless spectroheliograms of September 22, 1968 (Purcell and Tousey, 1969) and November 4, 1969 (Tousey, 1971) – on which the image of a flare was recorded.

Other solar identifications in the same spectral region include the resonance lines of NiXVII and NiXVIII, and one 3p–3d multiplet of FeXIII. The solar blend at 417 Å involving the FeXV inter-combination line and SXIV is resolved.

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. 665
Copyright
Copyright © Reidel 1972

References

Purcell, J. D. and Tousey, R.: 1969, Bull. A.A.S. 1, No. 3, 290.Google Scholar
Tousey, R.: 1971, Phil. Trans. Roy. Soc. London A, 270, 59.Google Scholar