Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225..252m&link_type=abstract
Astrophysical Journal, Part 1, vol. 225, Oct. 1, 1978, p. 252-258.
Astronomy and Astrophysics
Astrophysics
29
Far Ultraviolet Radiation, Skylab Program, Solar Corona, Solar Radiation, Spectroheliographs, Astronomical Models, Line Spectra, Polar Regions, Solar Wind Velocity, Spaceborne Experiments, Velocity Measurement
Scientific paper
Emission gradient curves for extreme-ultraviolet resonance lines of lithiumlike ions have been constructed from spectroheliograms of a northern polar coronal hole observed on August 14, 1973, with the Harvard experiment on Skylab. An emission-measure analysis indicates both reduced density and coronal temperature in the coronal hole. The boundary geometry of the coronal hole is determined, and a temperature-density model that is consistent with the observed intensities is constructed. The model gives a conductive flux of 60,000 erg/sq cm per sec at 1.03 solar radii. The boundary geometry and density distribution are combined with typical solar-wind parameters at the earth to determine an outflow velocity of 15 km/s at 1.08 solar radii.
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