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Solar Coronal Fe XVII X-Ray Line Ratios

Published online by Cambridge University Press:  12 April 2016

H.R. Rugge  and
D.L. McKenzie
H.R. Rugge
Affiliation:
Space Sciences Laboratory The Aerospace Corporation Los Angeles, CA
D.L. McKenzie
Affiliation:
Space Sciences Laboratory The Aerospace Corporation Los Angeles, CA

Extract

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The SOLEX bragg crystal spectrometer experiment on the P78-1 satellite (Landecker, McKenzie and Rugge, 1979) has been used to determine accurate flux ratios of several strong solar Fe XVII x-ray emission lines in the ~ 15 to ~ 17 Å wavelength region. The ratios chosen were selected because the lines used permitted an accurate determination of the ratios both from the aspect of counting statistics as well as the lack of interference from other lines of comparable strength. Observations for a variety of conditions of solar activity, ranging from quiet conditions to large solar flares, are presented. For these observations intensity variations of a factor of about 60 were observed for the Fe XVII lines. Variations of a factor of almost 800 were observed for the Fe XVIII line at 14.2 Å. The observed ratios of the Fe XVII lines are compared to the theories of Loulergue and Nussbaumer (1975) and Smith, Raymond, Mann and Cowan (1984).

Type
Session 6. Poster Papers
Information
International Astronomical Union Colloquium , Volume 86: Eighth International Colloquium on Ultraviolet and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas , 1984 , pp. 137 - 140
Copyright
Copyright © Naval Research Laboratory 1984. Publication courtesy of the Naval Research Laboratory, Washington, DC.

References

Landecker, P.B., McKenzie, D.L., and Rugge, H.R., 1979, Proc. S.P.I.E., 184, 285.Google Scholar
Loulergue, M. and Nussbaumer, H., 1975, Astron, and Astrophys. 45, 125.Google Scholar
Smith, B.W., Raymond, J.C., Mann, J.B. and Cowan, R.D., 1984, Los Alamos Preorint-LA-UR-84-1355.Google Scholar