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He-like Ar XVII triplet observed by RESIK

Sylwester, B; Sylwester, J; Phillips, KJH; Landi, E; (2008) He-like Ar XVII triplet observed by RESIK. ADV SPACE RES , 42 (5) 833 - 837. 10.1016/j.asr.2007.04.060.

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We present the observations of He-like Ar triplet lines obtained by RESIK spectrometer aboard CORONAS-F. Interpretation of intensity ratios between triplet lines of lower Z elements is known to provide useful diagnostics of plasma conditions within the emitting source. Here, we investigate whether triplet line ratios are useful for interpretation of higher Z element spectra. A high sensitivity, low background and precise absolute calibration of RESIK allow to consider in addition also the continuum contribution. This provides a way to determine the Ar absolute abundance from the observed triplet component ratios. The method is presented and the results are shown for two selected flares. Derived values of Ar absolute abundance for these flares are found to be similar: 2.6 x 10(-6) and 2.9 x 10(-6). They fall in the range between presently accepted Ar photospheric and coronal abundances. (C) 2008 Published by Elsevier Ltd on behalf of COSPAR.

Title:He-like Ar XVII triplet observed by RESIK
Keywords:solar physics, X-ray flares, spectroscopic plasma diagnostic, FLARE ABUNDANCES, SOLAR, SPECTROMETER, SPECTRA, LINES, SI
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Space and Climate Physics

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