Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...226..698m&link_type=abstract
Astrophysical Journal, Part 1, vol. 226, Dec. 1, 1978, p. 698-705. NASA-supported research.
Astronomy and Astrophysics
Astrophysics
96
Astronomical Spectroscopy, Chromosphere, Far Ultraviolet Radiation, Solar Limb, Solar Spectra, Atmospheric Models, Emission Spectra, Line Spectra, Mass Flow, Skylab Program, Solar Temperature, Spectral Line Width, Spectrographs, Spicules, Velocity Measurement
Scientific paper
Line profiles of optically thin extreme-ultraviolet emission lines observed in a quiet sun region at positions within and above the white-light limb with the NRL slit spectrograph (S082-B) on Skylab are discussed. Absolute line intensities and full widths at half-maximum are presented for lines formed over the temperature range from about 10,000 to 22,000 K. The line intensities are compared with the predictions of simple atmospheric models consisting of a spicule component and a thin spherically symmetric or network models, but can be explained by assuming that the emission arises from spicule-like inhomogeneities. Random mass-motion velocities are calculated. The velocity increases with increasing temperature of line formation. Near the limb and above about 4000 K the calculated velocity is consistent with the predictions of a constant acoustic flux passing through the transition zone. For the ions formed at temperatures not less than about 63,000 K, the velocity is found to increase with increasing height above the white-light limb.
Doschek George A.
Feldman Uri
Mariska John T.
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