MgIX and SiXI line ratios in the sun

Details MgIX and SiXI line ratios in the sun MgIX and SiXI line ratios in the sun

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...94...91k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 94, Aug. 1984, p. 91-98. Research supported by the Smithsonian Institution.

Physics

59

Line Spectra, Magnesium, Silicon, Solar Activity, Solar Atmosphere, Solar Spectra, Beryllium, Coronal Loops, Electron Density (Concentration), Electron Energy, Emission Spectra, Plasma Diagnostics, Solar Flares

Scientific paper

New theoretical emission line ratios for the Be-sequence ions Mg IX and Si XI are presented. A comparison with observational data for two solar flares and an active region loop obtained with the Harvard EUV spectrometer and NRL XUV spectroheliograph aboard Skylab reveals that these plasmas are in ionization equilibrium at coronal temperatures. Unfortunately most of the density diagnostics are not particularly useful under solar plasma conditions, as they vary only slightly over the electron density range 108-1013cm-3. However the Si XI ratio I(3Pe2-3Po2)/I(3Po1-1Se0) is density sensitive in the range 108 to 1010cm-3, which is representative of electron densities found in solar active regions or small flares.

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