Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979soph...61..319m&link_type=abstract
Solar Physics, vol. 61, Mar. 1979. p. 319-334. Research supported by the Norges Almenvitenskapelige Forskningsrad;
Astronomy and Astrophysics
Astronomy
10
Far Ultraviolet Radiation, Skylab Program, Solar Prominences, Spaceborne Astronomy, Apollo Telescope Mount, Astronomical Photometry, Electron Density (Concentration), Electron Pressure, Solar Velocity, Spectral Line Width
Scientific paper
Measurements of line intensities and line widths for three quiescent prominences observed with Naval Research Laboratory slit spectrograph on ATM/Skylab are reported. The wavelengths of the observed lines cover the range 1175 A to 1960 A. The measured intensities have been calibrated to within approximately a factor 2 and are average intensities over a 2 arcsec by 60 arcsec slit. Nonthermal velocities from the measured line widths are derived. The nonthermal velocity is found to increase with temperature in the prominence transition zone. Electron densities and pressures are derived from density sensitive line ratios. Electron pressures for two of the prominences are found to lie in the range 0.04-0.08 dyn/sq cm, while values for the third and most intense and active of the three prominences are in the range 0.07-0.22 dyn/sq cm.
Cook William J.
Kjeldseth Moe Olav
Mango Stephen A.
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