Emission line ratios for Si XI applicable to CDS/SUMER observations from Soho |
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| Authors: | F P Keenan C J Greer V J Foster and K G Widing |
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| Institution: | (1) Department of Pure and Applied Physics, The Queen's University of Belfast, BT7 1NN Belfast, Northern Ireland;(2) Code 7674W, E.O. Hulburt Center for Space Research, Naval Research Laboratory, 20375-5352, Washington DC, USA |
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| Abstract: | Calculations of electron temperature (T
e) and density (N
e) sensitive line ratios in Sixi involving transitions in the  358–604  wavelength range are presented. These are shown in the form of ratio-ratio diagrams, which should in principle allow bothN
e andT
e to be deduced for the Sixi line-emitting region of a plasma. However a comparison of these with observational data for two solar flares, obtained with the Naval Research Laboratory's S082A spectrograph on boardSkylab, reveals that the experimental ratios are much larger than expected from theory, which is probably due to the Sixi lines in the S082A spectra being blended with transitions from species including Nev, Fexi, and Fexii. Possible future applications of the Sixi results to spectral data from the Coronal Diagnostic Spectrometer on the Solar and Heliospheric Observatory are briefly discussed. |
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