J. Phys. Colloques
Volume 49, Numéro C1, Mars 1988IAU Colloquium N° 102 on UV and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas
|Page(s)||C1-331 - C1-334|
J. Phys. Colloques 49 (1988) C1-331-C1-334
THE COMPARISON OF HELIUM-LIKE ION EMISSION LINE RATIOS WITH SOLAR X-RAY SPECTRAL DATAS.M. McCANN et F.P. KEENAN
Department of Pure and Applied Physics, The Queen's University of Belfast , GB-Belfast BT7 INN, Northern Ireland
Electron impact excitation rates recently calculated by Keenan, McCann and Kingston for transitions in the He-like ions Al XII , Si XIII and S XV are used t o derive the electron taperature sensitive emission line ratio G and the density sensitive ratio R in its low density limit (Ro). These ratios are compared with those calculated by other authors and with the values obtained for solar flares using instruments on board the P78-1 and Solar Maximum Mission satellites. In general it is found that our results resolve discrepancies which currently exist between observation and theory. which prwides experimental support for the methods and atanic data adopted in the present analysis.