Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...89..253k&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 89, Dec. 1983, p. 253-259. Research supported by the Japan Society for the promotion of Sci
Astronomy and Astrophysics
Astronomy
1
Extreme Ultraviolet Radiation, Line Spectra, Solar Limb, Solar Spectra, Ultraviolet Astronomy, Absorbers, Astronomical Models, Emission Spectra, Optical Thickness, Ultraviolet Absorption
Scientific paper
The weakening of the EUV line emission near the sun's limb is studied to acquire information about the absorbers causing the weakening. The equivalent optical thickness of the absorbers for the Lyman continuum is determined as a function of the distance from the center of the solar disk by use of Skylab spectroheliograms in O IV 554 A and O VI 1032 A. It is found that: (1) the weakening cannot be explained by shielding of EUV-emitting sources in terms of completely opaque spicules, and (2) the distribution of the equivalent optical thickness on the solar disk is extremely flat with a maximum at a position of about 5 arcsec above the white-light limb. The results imply that the absorbers are a number of mass blobs consisting of cool chromospheric material which overlies the EUV emitting sources. It is suggested that both the EUV emitting sources and the absorbers are the remnants of H-alpha-emitting spicules which are diffused into the corona.
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