Abstract
The relative intensities of FeXI-Fe XIII lines in the range 176–207 Å have been measured for various plasma structures of the solar corona using data from the XUV spectroheliograph of the SPIRIT instrumentation onboard the CORONAS-F satellite with an improved spectral sensitivity calibration. Electron density diagnostics of a plasma with temperatures 0.8–2.5 MK has been carried out in active regions, quiet-Sun and off-limb areas, and, for the first time, in extremely intense solar flares. The density range is (1.6–8) × 109 cm−3 for flares, (0.6–1.6) × 109 cm−3 for active regions, and ∼5 × 108 cm−3 for quiet-Sun areas. The calibration accuracy of the spectral sensitivity for the spectroheliograph has been analyzed based on spectral lines with density-independent intensity ratios.
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Original Russian Text © S.V. Shestov, A.M. Urnov, S.V. Kuzin, I.A. Zhitnik, S.A. Bogachev, 2009, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2009, Vol. 35, No. 1, pp. 927–939.
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Shestov, S.V., Urnov, A.M., Kuzin, S.V. et al. Electron density diagnostics for various plasma structures of the solar corona based on Fe XI-FeXIII lines in the range 176–207 Å measured in the SPIRIT/CORONAS-F experiment. Astron. Lett. 35, 45–56 (2009). https://doi.org/10.1134/S106377370901006X
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DOI: https://doi.org/10.1134/S106377370901006X