The Optically Thick Fe XVII Spectrum: X-Ray, Extreme-Ultraviolet, and Forbidden Line Ratios

Details The Optically Thick Fe XVII Spectrum: X-Ray, Extreme-Ultraviolet, and Forbidden Line Ratios The Optically Thick Fe XVII Spectrum: X-Ray, Extreme-Ultraviolet, and Forbidden Line Ratios

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...516..482b&link_type=abstract

The Astrophysical Journal, Volume 516, Issue 1, pp. 482-489.

Astronomy and Astrophysics

Astronomy

18

Atomic Processes, Sun: Flares, Sun: Uv Radiation

Scientific paper

Level populations, X-ray line fluxes, and extreme-ultraviolet (EUV) line intensities are calculated for a 37 level model of the Fe XVII ion, as functions of the column density of Fe XVII, in slab geometry and cylindrical geometry. The resonance lines at 15.02 and 15.25 Å are found to exhibit initial increases in fluxes relative to the forbidden line at 17.10 Å and the usual reference resonance line at 16.78 Å as optical thickness increases. Eleven EUV lines and the forbidden 2p^53s(^3P_0-^3P_1) transition near 1154 Å are also found to be relatively enhanced by opacity.

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