Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...426..454k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 426, no. 1, p. 454-458
Astronomy and Astrophysics
Astronomy
1
Electron Energy, Emission Spectra, Line Spectra, Silicon, Solar Flares, Solar X-Rays, X Ray Astronomy, X Ray Spectra, Ratios, Satellite-Borne Instruments, Solar Maximum Mission, Spectrometers
Scientific paper
Theoretical Si XIII electron-temperature-sensitive emission-line ratios, which include satellite-line contributions to the intensities of the forbidden (f) (1s2)(1S) goes to (1s2s)(3S), intercombination (i) (1s2(1S) goes to (1s2p)(3P1,2), and resonance (r) (1s2)(1S) goes to (1s2p)(1P) transitions, are presented for G = (I(f) + I(r), R = I(f)/I(i), R1 = I((1s2)(1S) goes to (1s3p)(1P))/I(r). These ratios are significantly different from those calculated assuming that satellites do not contribute to f, i, and r, and, in addition, are more temperature-sensitive over the range log Te = 6.4-7.4. Electron temperatures deduced using the new diagnostics in conjunction with observed values of G, R1, and R2 from solar-flare spectra obtained by the SOLEX spectrometers aboard the P78-1 satellite are found to be generally consistent. This provides support for the validity of the theoretical R1 and R2 diagnostics and also resolves discrepancies noted previously when the line ratios were compared with observations from the Solar Maximum Mission spectrometers. The R ratio, which is in the low-density limit under solar flare conditions, is found not to be a useful Te diagnostic when satellite contributions to f and i are included in the theoretical line ratios. However, the observed values of R from the SOLEX spectra are in good agreement with theoretical predictions, which provides additional support for the accuracy of the line-ratio calculations.
Conlon E. S.
Keenan Francis P.
McKenzie David L.
Phillips Kenneth J. H.
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