Measurement of wavelengths for inner-shell transitions in CA XVII-XIX

Details Measurement of wavelengths for inner-shell transitions in CA XVII-XIX Measurement of wavelengths for inner-shell transitions in CA XVII-XIX

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...338..567s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 338, March 1, 1989, p. 567-577. Research supported by NASA.

Physics

Atomic Physics

7

Atomic Physics, Electron Transitions, Solar Flares, Solar Spectra, Atomic Recombination, Calcium, Emission Spectra, Ground State, X Ray Spectra

Scientific paper

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.

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