Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.188..365f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 188, Aug. 1979, p. 365-370.
Astronomy and Astrophysics
Astronomy
18
Iron, Nitrogen, Solar Flares, Solar Spectra, X Ray Astronomy, Laser Plasmas, Line Spectra, Metallic Plasmas, Plasma Spectra
Scientific paper
Spectral line classifications and wavelength measurements are presented which provide essential data for the interpretation of soft X-ray spectroscopic observations of solar flares. Ni XXV and Ni XXVI spectral lines are identified in spectra emitted from plasmas formed by focusing the output of a multigigawatt neodymium laser onto plane solid targets at an irradiance of about 10 to the 16th W/sq cm. A photographic beryl-crystal spectrograph was used to record spectra in the wavelength range 8-13 A. Line classifications were made with the aid of theoretical calculations of wavelengths and oscillator strengths. Observations of isoelectronic Be I-like Fe XXIII and Li I-like Fe XXIV spectra are also presented. The relevance of the data to the interpretation of solar flare spectra is discussed.
Fawcett B. C.
Hughes Thomas P.
Ridgeley Allan
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