Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247..686r&link_type=abstract
Astrophysical Journal, Part 1, vol. 247, July 15, 1981, p. 686-691. Research supported by the Smithsonian Institution;
Astronomy and Astrophysics
Astrophysics
122
Coronal Holes, Emission Spectra, Solar Corona, Solar Spectra, Spectral Energy Distribution, Ultraviolet Spectra, Coronal Loops, Energy Dissipation, Iue, Line Spectra, Solar Atmosphere
Scientific paper
Emission measure curves are presented for average coronal hole and quiet-sun spectra taken during the Skylab mission by Vernazza and Reeves (1978), and the curves are used to discuss the energy balance in each region. Close-coupling calculations are used for the Be sequence, assuming a 10 level ion; for B sequence ions mainly distorted wave calculations in an 11 level ion are used, but close-coupling cross sections are used for some ions; for C and Mg sequence ions, distorted wave calculations are used with 15 and 10 level ions, respectively, and close-coupling results are used for Li-like ions with two levels. Results are presented and include the following: the coronal hole spectrum shows a smaller slope in the emission measure distribution, consistent with the expected outflow effects. It is concluded that the simple constant pressure models of static coronal loops of constant cross section are basically able to match the observed emission measure distribution of the average quiet sun between 1,000,000 and 10,000,000 K. However, the cell center and network distributions are respectively steeper and shallower than predicted by the detailed cooling curve.
Doyle Gerry J.
Raymond John C.
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