Inner-shell transitions in Fe XIX-XXII in the X-ray spectra of solar flares and Tokamaks

Details Inner-shell transitions in Fe XIX-XXII in the X-ray spectra of solar flares and Tokamaks Inner-shell transitions in Fe XIX-XXII in the X-ray spectra of solar flares and Tokamaks

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265.1120p&link_type=abstract

Astrophysical Journal, Part 1, vol. 265, Feb. 15, 1983, p. 1120-1134.

Other

28

Atomic Spectra, Electron Transitions, Solar Flares, Solar Spectra, Tokamak Devices, X Ray Spectra, Atomic Excitations, Computer Programs, Electron Recombination, Ions, Iron, Line Spectra

Scientific paper

Calculated spectra of the ions Fe XIX-XXII for various densities and temperatures are presented, thereby extending the work begun by Doschek, Feldman, and Cowan (1981). The calculations are based on a code (the Cowan code) that computes both the level structure of an ion and intensity factors for the 1s-2p satellite lines. A comparison is made between the calculated spectra and those observed in solar flares by the P78-1 and SMM instruments. The observed intensities of Fe XX lines, which are the most sensitive to density, are found to agree well with those calculated in the low-density limit. The agreement for lines arising from other ions is also very good. It is also seen that the predicted density variations in Fe XX are confirmed by the higher density Princeton Large Torus plasmas. Thus a possible useful density diagnostic is indicated for tokamak and high-density astrophysical plasmas, perhaps including some solar flares.

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