CA XV line ratios in solar flares

Details CA XV line ratios in solar flares CA XV line ratios in solar flares

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...327..473k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 327, April 1, 1988, p. 473-476. SERC-supported research.

Astronomy and Astrophysics

Astrophysics

17

Calcium, Electron Impact, Emission Spectra, Line Spectra, Solar Flares, Solar Spectra, Atomic Energy Levels, Electron Density (Concentration), Electron Energy, Electron Transitions, Planetary Nebulae, Solar Prominences

Scientific paper

Recent R-matrix calculations of electron impact excitation rates for Ca XV have been used to obtain theoretical density-sensitive emission line ratios which are applicable to solar flares. Results for electron densities derived from the I(208.71 A)/I(200.95 A), I(181.90 A)/I(200.95 A), and I(215.37 A)/I(200.95 A) values for solar flares obtained by the Skylab NRL S082A slitless spectrograph are in excellant agreement. Ca XV electron densities are found to compare favorably with those determined from the line ratios of ions formed at similar electron temperatures. The results provide support for the accuracy of the adopted atomic data and for the line ratio calculation method.

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