Other
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229.1163c&link_type=abstract
Astrophysical Journal, Part 1, vol. 229, May 1, 1979, p. 1163-1178.
Other
54
Carbon, Line Spectra, Luminous Intensity, Ratios, Skylab Program, Solar Spectra, Ultraviolet Spectra, Atmospheric Models, Electron Density (Concentration), Electron Energy, Emissivity, Isothermal Processes, Silicon, Solar Flares, Solar Prominences
Scientific paper
Solar observations of C III line intensity ratios are analyzed which were obtained by the Naval Research Laboratory extreme-ultraviolet slit spectrograph on Skylab from quiet and active regions, coronal holes, prominences, and a flare. Electron densities are determined by comparing the observed intensity ratios to their theoretical variation as a function of electron density and temperature. Both isothermal line ratios that are evaluated at a characteristic emitting temperature and ratios that are integrated through the temperature and density structure of a model solar atmosphere are calculated. The density-sensitive ratios R(Si IV 1402/C III 1908) and R(Si III 1892/C III 1908) are also used to derive additional values of electron density. It is found that the ratios R(C III 1247/C III 1908), R(Si IV 1402/C III 1908), and R(Si III 1892/C III 1908) give consistent values of electron density for each feature. The C III 1908-A, Si III 1892-A, and Si IV 1402-A lines have recently been observed from the IUE satellite in spectra of late-type stars, and can serve as practical density diagnostics that are independent of assumptions about the stellar surface gravity.
Cook William J.
Nicolas K. R.
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