Improved data for solar flare X-ray spectral analysis

Francis Keenan, J.A. Rainnie, K.J.H. Phillips, L.K. Harra, J. Dubau, N.J. Peacock

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The inclusion of collisional rates for He-like Fe and Ca ions is discussed with reference to the analysis of solar flare Fe XXV and Ca XIX line emission, particularly from the Yohkoh Bragg Crystal Spectrometer (BCS). The new data are a slight improvement on calculations presently used in the BCS analysis software in that the discrepancy in the Fe XXV y and z line intensities (observed larger than predicted) is reduced. Values of electron temperature from satellite-to-resonance line ratios are slightly reduced (by up to 1 MK) for a given observed ratio. The new atomic data will be incorporated in the Yohkoh BCS databases. The data should also be of interest for the analysis of high-resolution, non-solar spectra expected from the Constellation-X and Astro-E space missions. A comparison is made of a tokamak S XV spectrum with a synthetic spectrum using atomic data in the existing software and the agreement is found to be good, so validating these data for particularly high-n satellite wavelengths close to the S XV resonance line. An error in a data file used for analyzing BCS Fe XXVI spectra is corrected, so permitting analysis of these spectra.
Original languageEnglish
Pages (from-to)765-773
Number of pages9
JournalAstronomy and Astrophysics
Volume416
Issue number2
Publication statusPublished - Mar 2004

ASJC Scopus subject areas

  • Space and Planetary Science

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