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Measurement of wavelengths for inner-shell transitions in Ca XVII-XIX (1989)

Doschek, G. A. ; Seely, J. F.

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Publication Date: 2011-08-19

Description: The wavelengths of transitions in solar flare spectra in the region 3.12-3.24 A have been measured using data recorded by a crystal spectrometer on the Air Force P78-1 spacecraft. Appearing in this wavelength region are inner-shell transitions of the type n = 1-2 in Ca XVII-XIX and resonance transitions in Ar XVII, Ar XVIII, and Fe XXV. The hydrogenic Ar XVIII 1s-1p transition was used to establish an absolute wavelength scale with an estimated uncertainty of 0.3 mA, and the relative wavelengths were measured to an uncertainty that is typically less than 0.1 mA. The presently measured wavelengths are compared with previously measured and calculated wavelengths, and the observed flare spectra are compared with synthetic spectra.

Keywords: SOLAR PHYSICS

Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 338; 567-577

Format: text

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