EUV observations of quiescent prominences from SKYLAB

Astronomy and Astrophysics – Astronomy

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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.

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