Physics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.273..520p&link_type=abstract
Nature, vol. 273, June 15, 1978, p. 520-522.
Physics
2
Centimeter Waves, Coronal Holes, Radio Telescopes, Solar Radio Emission, Spectroheliographs, Thermal Mapping, Decametric Waves, Plasma Density, Solar Wind, Temperature Profiles
Scientific paper
Observations made between Aug. 31 and Sept. 4, 1977, at 11.5 and 21 cm with the Arecibo telescope are described for coronal holes. Solar radio maps were obtained from 21 scans in right ascension, separated by 2.0 arc min in declination, with each scan representing 60 arc min. Half power beamwidths were 3.8 arc min at 21 cm and 3.3 arc min at 11.5 cm. In making the (7) solar maps, the antenna temperature of the quiet solar disk was set equal to 100 (on a scale of 100), while the antenna temperature away from the sun was set to zero. A contour scheme is used to represent temperature gradients in coronal hole regions. It is found that the antenna temperature in the hole is 20-25% lower than the solar background disk at 11.5 cm, and 30-35% lower at 21 cm. Results are seen to confirm the hypothesis that the temperature depression becomes more pronounced as wavelengths are increased from 4 cm in the decimeter range.
Papagiannis Michael D.
Wefer Fred L.
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