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The Interpretation of EUV Spectra of Sunspots

Published online by Cambridge University Press:  12 April 2016

J.G. Doyle ,
J.C. Raymond ,
R.W. Noyes  and
A.E. Kingston
J.G. Doyle
Affiliation:
Armagh Observatory
J.C. Raymond
Affiliation:
Harvard-Smithsonian Center for Astrophysics
R.W. Noyes
Affiliation:
Harvard-Smithsonian Center for Astrophysics
A.E. Kingston
Affiliation:
Queen's University of Belfast

Extract

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We report here on EUV observations of a sunspot observed by the Harvard instrument on Skylab. The observational data used here have been presented in a previous paper by Noyes et al. (1982), in which line identifications and intensities for the wavelength region 350 – 1350 A were given. Several electron density sensitive line ratios suggest a constant density, rather than constant pressure, emitting region, while temperature diagnostic line ratios of several ions yield temperatures below the temperatures expected in ionization equilibrium.

Type
Session III: Observed Activity in Related Objects
Information
International Astronomical Union Colloquium , Volume 71: Activity in Red-Dwarf Stars , 1983 , pp. 325 - 326
Copyright
Copyright © Reidel 1983

References

Foukal, P.V.: 1976, Astrophys.J. 210, 575.CrossRefGoogle Scholar
Noyes, R.W., Raymond, J.C., Doyle, J.G., and Kingston, A.E.: 1982, Astrophys J. (submitted).Google Scholar
Pneuman, G.W. and Kopp, R.A.: 1977, Astron. Astrophys. 55, 305.Google Scholar
Raymond, J.C. and Foukal, P.V.: 1982, Astrophys. J. 253, 323.CrossRefGoogle Scholar