Extreme ultraviolet line ratios for CA XV applicable to solar flare spectra

Details Extreme ultraviolet line ratios for CA XV applicable to solar flare spectra Extreme ultraviolet line ratios for CA XV applicable to solar flare spectra

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...401..411k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 401, no. 1, p. 411-415.

Physics

Atomic Physics

9

Electron Impact, Emission Spectra, Extreme Ultraviolet Radiation, Solar Flares, Solar Spectra, Atomic Physics, Calcium, Electron Density (Concentration), Fine Structure

Scientific paper

New R-matrix calculations of electron impact excitation rates in Ca XV are used to derive theoretical electron density diagonstic emission-line ratios involving 2s2 2p2 - 2s 2p3 transitions in the wavelength range 180-215 A. A comparison of these with observational data for solar flares obtained with the Naval Research Laboratory's S082A spectrograph on board Skylab reveals excellent agreement between theory and observation, as does a comparison with line ratio measurements from the TEXT tokamak plasma, for which the electron temperature and density have been independently determined. This provides experimental support for the accuracy of the atomic data, and hence line ratio calculations, employed in the present analysis.

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