Emission Line Ratios for SI XI Applicable to CDS/SUMER Observations from SOHO

Details Emission Line Ratios for SI XI Applicable to CDS/SUMER Observations from SOHO Emission Line Ratios for SI XI Applicable to CDS/SUMER Observations from SOHO

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995soph..161..159k&link_type=abstract

Solar Physics, Volume 161, Issue 1, pp.159-164

Physics

3

Scientific paper

Calculations of electron temperature (T e) and density (N e) sensitive line ratios in Si xi involving transitions in the ˜ 358 604 Å 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 Si xi 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 Si xi lines in the S082A spectra being blended with transitions from species including Ne v, Fe xi, and Fe xii. Possible future applications of the Si xi results to spectral data from the Coronal Diagnostic Spectrometer on the Solar and Heliospheric Observatory are briefly discussed.

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