Other
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...253..323r&link_type=abstract
Astrophysical Journal, Part 1, vol. 253, Feb. 1, 1982, p. 323-329. Research supported by the Smithsonian Institution;
Other
37
Coronal Loops, Extreme Ultraviolet Radiation, Solar Corona, Solar Spectra, Stellar Models, Ultraviolet Spectra, Magnetohydrodynamics, Plasma Temperature, Skylab Program, Solar Limb, Solar Wind, Stellar Temperature
Scientific paper
EUV spectra of three active region loops observed above the solar limb with the SO55 spectrometer on Skylab are analyzed. It is noted that the lengths, peak temperatures, and pressures of the loops are typical of the X-ray coronal loops to which static models have been applied. It is found that the physical parameters of the coronal loop plasma derived from EUV spectra and raster pictures are not well represented by the static models. Although the loops also contain a significant quantity of cool plasma, no physical reason is found to differentiate them from other active region loops of similar length, pressure, and temperature. Several line ratios in the loop spectrum suggest departures from ionization equilibrium caused by rapid cooling. The source of this cooling material is discussed with reference to several models of loop dynamics.
Foukal Peter
Raymond John C.
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