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EUV Spectroscopy of Solar Transition Zone Plasmas

Published online by Cambridge University Press:  25 September 2017

U. Feldman  and
G.A. Doschek
U. Feldman
Affiliation:
Naval Research Laboratory, Washington, D.C., USA
G.A. Doschek
Affiliation:
Naval Research Laboratory, Washington, D.C., USA

Extract

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High resolution solar spectra were recorded by the NRL normal incidence slit spectrograph on Skylab in the wavelength range from 1100 Å to 2000 Å. The spectral resolution is 0.06. Å and the spatial resolution at the Sun is 2“ x 60“. Several temperature and density-sensitive spectral lines occur in this wavelength region produced by ions formed in the transition zone at temperatures between ∽ 2 x 104 to ∽2 x 105 K. These lines are used to infer the electron density and plasma volumes in different solar regions, e.g., flares, surges, active regions, the quiet Sun and coronal holes. The densities in regions of activity are frequently found to be quite high (> 1011 cm–3), implying a filamentrary structure for the emitting plasma. In addition, from spectral line widths, regions of activity are frequently found to be highly turbulent. An attempt will be made to correlate non-thermal line widths with electron density enhancements.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 43: Vth Conference on UV & X-Ray Spectroscopy of Astrophysical & Laboratory Plasmas , July 1977 , pp. 11
Copyright
Copyright © Crown Research Institutes 1977