Physics
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978stin...7834023j&link_type=abstract
Semi-Annual Status Report, 1 Jul. 1977 - 31 Dec. 1977 University of Southern California, Los Angeles.
Physics
Helium, Line Spectra, Solar Spectra, Sun, Flux Density, Solar Activity, Spectrometers, Ultraviolet Spectra
Scientific paper
The intensity and profile of the helium resonance line at 584 A from the entire disc of the sun was investigated using a rocket-borne helium-filled spectrometer and a curve of growth technique. The line profile was found to be accurately represented by a Gaussian profile with full width at half maximum of 122 plus or minus 10m A while the integrated intensity was measured to be (2.6 plus or minus 1.3) x 10 to the 9th power/photons sec sq cm at solar levels of F10.7 = 90.8 x 10 to the minus 22th power/sq m Hz and Rz = 27. The measured linewidth is in good agreement with previous spectrographic measurement but the integrated intensity is larger than most previous photoelectric measurements. However, the derived line center flux of (2.0 plus or minus 1.0) x 10 to the 10th power/photons sec sq cm A is in good agreement with values inferred from airglow measurements.
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