New calculations of Fe spectra in high-temperature plasmas

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Spectroscopic data acquired during the ASCA performance verification phase have revealed a discrepancy between measured line flux ratios and the predictions of standard plasma emission codes. In plasmas for which coronal ionization equilibrium should apply, flux ratios of 4--2 and 3--2 line complexes in highly-ionized Fe are observed to be significantly lower than predicted, thus compromising the quality of spectral fits. We have recalculated Fe L-shell spectra using the HULLAC atomic physics package and present results for the ionization stages Fe XXI-XXIV. Our preliminary results show (4{minus}2)/(3{minus}2) ratios that are substantially smaller than those tabulated in the commonly used spectral ... continued below

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11 p.

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Liedahl, D. A.; Osterheld, A. L.; Mewe, R. & Kaastra, J. S. March 30, 1994.

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Description

Spectroscopic data acquired during the ASCA performance verification phase have revealed a discrepancy between measured line flux ratios and the predictions of standard plasma emission codes. In plasmas for which coronal ionization equilibrium should apply, flux ratios of 4--2 and 3--2 line complexes in highly-ionized Fe are observed to be significantly lower than predicted, thus compromising the quality of spectral fits. We have recalculated Fe L-shell spectra using the HULLAC atomic physics package and present results for the ionization stages Fe XXI-XXIV. Our preliminary results show (4{minus}2)/(3{minus}2) ratios that are substantially smaller than those tabulated in the commonly used spectral models and point to the possibility of bringing theoretical spectra into accord with the observations.

Physical Description

11 p.

Notes

OSTI as DE94009919; Paper copy available at OSTI: phone, 865-576-8401, or email, reports@adonis.osti.gov

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  • Advanced satellite for cosmology and astrophysics symposium,Tokyo (Japan),8-11 Mar 1994

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  • Other: DE94009919
  • Report No.: UCRL-JC--116866
  • Report No.: CONF-9403100--1
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/10141954 | External Link
  • Office of Scientific & Technical Information Report Number: 10141954
  • Archival Resource Key: ark:/67531/metadc1315078

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  • March 30, 1994

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  • Nov. 3, 2018, 11:47 a.m.

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  • Nov. 12, 2018, 3:30 p.m.

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Liedahl, D. A.; Osterheld, A. L.; Mewe, R. & Kaastra, J. S. New calculations of Fe spectra in high-temperature plasmas, report, March 30, 1994; California. (digital.library.unt.edu/ark:/67531/metadc1315078/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.