Electron density diagnostic line ratios from the N = 3 lines of O V

Details Electron density diagnostic line ratios from the N = 3 lines of O V Electron density diagnostic line ratios from the N = 3 lines of O V

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...257..913w&link_type=abstract

Astrophysical Journal, Part 1, vol. 257, June 15, 1982, p. 913-917.

Astronomy and Astrophysics

Astronomy

17

Electron Density (Concentration), Line Spectra, Oxygen Spectra, Solar Flares, Atomic Collisions, Solar Corona, Transition Probabilities, Ultraviolet Astronomy

Scientific paper

New atomic physics calculations are presented for electron excitation rates for transitions between the n = 2 and n = 3 levels of O v. These are used to calculate theoretical line intensity ratios for the 192 A, 215 A, 220 A, and 248 A lines of O v. These line intensity ratios are electron density sensitive and provide valuable diagnostics at an electron temperature of approximately 200,000 for small impulsive flare events in which the transition zone ions are enhanced relative to the coronal ions. Two flares observed by the NRL spectroheliograph on Skylab, on December 22, 1973, and January 21, 1974, are studied, with electron densities of approximately 3 x 10 to the 11th per cu cm being deduced.

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