Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apjs...40..341d&link_type=abstract
Astrophysical Journal Supplement Series, vol. 40, June 1979, p. 341-364. Research supported by the Science Research Council.
Astronomy and Astrophysics
Astrophysics
139
Electron Density (Concentration), Far Ultraviolet Radiation, Plasma Diagnostics, Solar Flares, Solar Spectra, Ultraviolet Spectroscopy, Electron Energy, High Temperature, Iron, Isoelectronic Sequence, Line Spectra, Metal Ions, Nickel, Skylab Program, Spectroheliographs, Tables (Data)
Scientific paper
Potential electron-density diagnostics for the high-temperature component of solar flares are studied with reference to the wavelength region from 171 to 630 A. The specific ions discussed include Fe IX through Fe XV, Ni XI through Ni XVII, and ions in the beryllium, boron, carbon, and nitrogen isoelectronic sequences. Line ratios that could be useful as density indicators under solar-flare conditions are indicated, available data for the ions considered are reviewed, and several theoretical intensity ratios are plotted. The results are employed to determine the electron-density distribution as a function of electron temperature for several spectra from two flares. For these flares it is found that the electron density increases from 10 billion to 500 billion per cu cm for a temperature increase from 1 million to 10 million K.
Bhatia Anand K.
Dere Ken P.
Mason Harris E.
Widing Kenneth G.
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