view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Far ultraviolet spectrum of the Sun. Violett, T. ; Rense, W. A. Abstract Solar ultraviolet spectrograms were obtained from Aerobee-Hi rocket flights on 4 June, 1958 and 30 March, 1959. In each case the instrument was a grazing-incidence grating spectrograph whose speed was increased by a suitably designed toroidal mirror placed in front of the slit at grazing incidence. The instruments were pointed at the sun by a biaxial pointing control. Z4nith heights attained by the rockets were 220 km and 204 km, respectively. About 150 emission lines in the range 84-I216A were found to appear on spectrograms from both flights. About 200 other possible lines were present. The wave lengths of the lines have been measured in most cases to within an accuracy of o.~A. Rough visual estimates of the relative intensities of the lines were made, along with a quantitative estimate of the intensity of the 3o4A Heii resonance line for several altitudes of the rockets. The Heii line was by far the most intense line other than H La, and possibly could be more intense than the latter outside the earth's atmosphere. Identification of about 6o lines was made. The neutral and ionized atoms, H, He, 0, C, N, and Si, dominate. The Ovi line at I5oA was present. A rather intense line at 84A possibly could be due to Neviii. The high intensity of the scattered light background prevented the detection of any continuum in this region. A program for the systematic identification of the remaining lines has been launched. The research reported in this paper has been sponsored by the Geophysics Research Directorate of the Air Force Cambridge Research Center, Air Research and Development Command. Physics Department University of Colorado Boulder, Colo. Publication: The Astronomical Journal Pub Date: 1959 DOI: 10.1086/108041 Bibcode: 1959AJ.....64R.348V full text sources ADS |