Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.197p..29p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 197, Dec. 1981, p. 29P-34P.
Astronomy and Astrophysics
Astronomy
29
Electron Transitions, Iron, Solar Flares, Solar Spectra, Calcium, Hydrogen, Ions, Line Spectra, Solar Maximum Mission
Scientific paper
Observations of solar flare spectra over the wavelength range 1.769-1.796 A with the Bent Crystal Spectrometer on the NASA Solar Maximum Mission satellite are presented. The 2P3/2, 2P1/2 and associated satellite transitions of Fe XXVI are identified, their intensities and widths estimated and the results compared with theoretical predictions. For two spectra, which include the isolated n = 2 satellite features, the observations can be reproduced by plasma temperatures of 24,000,000 and 28,400,000 K. Linewidth measurements show evidence for nonthermal velocities of up to 150 km/s. Emission measures derived from the Fe XXVI observations are compared with those from lower temperature Ca XIX and Fe XXV measurements and an emission measure decreasing with temperature is found.
Antonucci Ester
Culhane Leonard J.
Gabriel Alan H.
Loulergue M.
Parmar Arvind N.
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