Electron-impact excitation of Be-like Mg

Del Zanna, G. and Rozum, I. and Badnell, N.R. (2008) Electron-impact excitation of Be-like Mg. Astronomy and Astrophysics, 487 (3). pp. 1203-1208. ISSN 0004-6361 (https://doi.org/10.1051/0004-6361:200809998)

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Abstract

We present an R-matrix calculation of electron-impact excitation of Be-like Mg. The calculation is similar to that one presented for Be-like Fe by Chidichimo et al. (2005, A&A, 430, 331), and was done with the intermediate-coupling frame transformation method and including a total of 98 fine-structure levels, up to n=4. We find significant differences with the widely used n=2 excitation rates of Keenan et al. (1986, Phys. Scr., 34, 216), calculated by interpolating R-matrix calculations along the Be-like sequence. We present a list of the most important transitions and a few comparisons with SOHO SUMER and CDS/GIS spectra of the solar corona. We show that previous long-standing discrepancies between observed and predicted line intensities are now resolved. We also show how temperatures of the solar corona were significantly underestimated. For example, a coronal hole inter-plume temperature of 850 000 K found by Wilhelm et al. (1998, ApJ, 500, 1023) is now revised to 1 160 000 K.

  • Item type:Article
    ID code:19561
    Dates:
    Date
    Event
    1 September 2008
    Published
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Strathprints Administrator
    Date deposited:31 May 2010 16:14
    Last modified:08 Apr 2024 17:41
    URI:https://strathprints.strath.ac.uk/id/eprint/19561
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