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On the problem of density diagnostics for the EUV spectrum of the solar transition zoneSpectral-line ratios that may be used to determine the electron temperature and density in the solar transition zone and corona are identified. The problem of interpreting the intensity ratios of C III lines observed in Skylab EUV limb spectra is considered. It is shown that the intensity distribution with height above the solar limb of the 1176-A C III lines is different from that of the 1909-A C III lines in the Skylab spectra, suggesting that model atmospheres must be folded into the C III calculations for proper interpretation of the data. Possible reasons for the differences in the intensity distributions and widths of the 1176-A and 1909-A lines are discussed along with an application to the analogous lines of Si III.
Document ID
19770056354
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Doschek, G. A.
(Hulburt (E. O.) Center for Space Research Washington, DC, United States)
Feldman, U.
(U.S. Navy, E. O. Hulburt Center for Space Research, Washington D.C., United States)
Date Acquired
August 9, 2013
Publication Date
June 1, 1977
Publication Information
Publication: Astronomy and Astrophysics
Volume: 58
Issue: 1-2,
Subject Category
Solar Physics
Accession Number
77A39206
Distribution Limits
Public
Copyright
Other

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