X-ray line ratios from helium-like ions - Updated theory and SMM flare observations

Details X-ray line ratios from helium-like ions - Updated theory and SMM flare observations X-ray line ratios from helium-like ions - Updated theory and SMM flare observations

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...269..319w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 269, June 1, 1983, p. 319-328. Research supported by the Science and Engine

Astronomy and Astrophysics

Astronomy

66

Electron Density (Concentration), Electron Plasma, Solar Flares, Solar Maximum Mission, Solar X-Rays, Electron Energy, Electron Transitions, Line Spectra, Resonance Lines, Spaceborne Astronomy

Scientific paper

The potential which the conduction of measurements of the three principal lines emitted from helium-like ions has for the determination of plasma electron density was initially pointed out by Gabriel and Jordan (1969). The diagnostic technique is based on the fact that the ratio, R, of the intensity of a forbidden line to the intensity of an intercombination line decreases as electron density increases due to collisional excitation of levels. In the present investigation a further refinement of this procedure is provided by specifically calculating the effects of cascades from levels with principal quantum numbers up to n=6. Two improved spectrometers recently placed in operation include the SOLEX instrument on the satellite P78-1 and the X-ray Polychromator (XRP) instrument on the NASA Solar Maximum Mission satellite. Measurements obtained with one of the spectrometers making up the XRP are presented, taking into account the emission from Ne IX ions.

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