Use of AL XII and MG XI lines as solar plasma diagnostics

Details Use of AL XII and MG XI lines as solar plasma diagnostics Use of AL XII and MG XI lines as solar plasma diagnostics

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..124..289b&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 124, no. 2, 1989, p. 289-302. Research supported by SERC.

Physics

3

Aluminum, Magnesium, Plasma Diagnostics, Solar Flares, Solar Spectra, Electron Emission, Electron Energy, Electron Flux Density, Resonance Lines, Solar Maximum Mission

Scientific paper

Three sets of observations of n = 1 to n = 2 lines due to heliumlike aluminum (Al XII) were made during two solar flares using the X-Ray Polychromator on the SMM satellite. The observed temperature-sensitive line ratio G is shown to be consistent with the close-coupling calculations of Keenan and McCann (1987), although values for the ratio R, which is both temperature- and density-sensitive for lower-Z elements, are not inconsistent with the theoretical calculations. This region of the spectrum also includes the heliumlike magnesium (Mg XI) 1(1S)-3(1P) line, and it is shown that the ratio of this line to the Al XII resonance 1(1S)-2(1P) line is a more sensitive indicator of electron temperature than are the Al XII G and R ratios.

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