X-ray emission-line ratios in MG XI as electron temperature diagnostics for solar flares and active regions

Details X-ray emission-line ratios in MG XI as electron temperature diagnostics for solar flares and active regions X-ray emission-line ratios in MG XI as electron temperature diagnostics for solar flares and active regions

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...393..815k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 393, no. 2, July 10, 1992, p. 815-818. Research supported by Department of

Astronomy and Astrophysics

Astrophysics

4

Electron Energy, Line Spectra, Solar Activity Effects, Solar Electrons, Solar Flares, Solar X-Rays, Electron Transitions, Elementary Excitations, Emission Spectra, Magnesium, Metal Ions

Scientific paper

Electron temperature-sensitive emission-line ratios are derived via electron impact excitation rates for transitions in helium-like Mg XI, calculated with the R-matrix code. These ratios are found to be significantly different from earlier diagnostic calculations of Keenan et al. (1984, 1991), and lead to electron temperature estimates up to a factor of about 1.6 larger. Values of Te deduced from R1 and R2 ratios measured from solar flare and active region spectra obtained with the FCS on board the SMM satellite are consistent and in good agreement with temperatures estimated from the observed G ratios for these solar features. This provides support both for the validity of the theoretical R1 and R2 diagnostics, and for the FCS calibration curve in the wavelength region covering the Mg XI transitions 7.472-9.314 A.

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