Emission lines of FeXV in spectra obtained with the Solar Extreme-Ultraviolet Research Telescope and Spectrograph

Francis Keenan, Kanti Aggarwal, Ryan Milligan, Robert Ryans, Shaun Bloomfield, Viji Srigengan, M.G. O'Mullane, K.D. Lawson, A.Z. Msezane, J.W. Brosius, J.M. Davila, R.J. Thomas

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Recent R-matrix calculations of electron impact excitation rates in Mg-like FeXV are used to derive theoretical emission-line ratios involving transitions in the 243-418 Åwavelength range. A comparison of these with a data set of solar active region, subflare and off-limb spectra, obtained during rocket flights by the Solar Extreme-Ultraviolet Research Telescope and Spectrograph (SERTS), reveals generally very good agreement between theory and observation, indicating that most of the FeXV emission lines may be employed with confidence as electron density diagnostics. In particular, the 312.55-Åline of FeXV is not significantly blended with a CoXVII transition in active region spectra, as suggested previously, although the latter does make a major contribution in the subflare observations. Most of the FeXV transitions which are blended have had the species responsible clearly identified, although there remain a few instances where this has not been possible. We briefly address the long-standing discrepancy between theory and experiment for the intensity ratio of the 3s21S-3s3p 3P1 intercombination line at 417.25 Åto the 3s21S-3s3p 1P resonance transition at 284.16 Å....
Original languageEnglish
Pages (from-to)1592-1598
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume356
Issue number4
DOIs
Publication statusPublished - Feb 2005

Keywords

  • atomic data
  • Sun: activity
  • Sun: flares
  • ultraviolet: general

ASJC Scopus subject areas

  • Space and Planetary Science

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