The Radio Spectrum of Coronal Hole 1,
BOSTON UNIV MASS DEPT OF ASTRONOMY
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In an effort to determine the spectral characteristics of radio features assoicated with coronal holes, radioheliograms obtained at five different wavelengths during the period 25 june through 02 july 1973 were analyzed. X-ray pictures of the sun give the position of Coronal Hole 1 CH1 on the solar disk during this period. Scans at the same solar latitude 40 N of the maps were used to reduce the radio spectrum of CH1. These scans showed also a westward displacement of the radio holerelative to the X-ray hole which is a not-well-understood effect that requires further study. Radio data at wavelengths ranging from 2.8 cm to 3.75 m obtained by other observers on subsequent disk passages of CH1 seem to fit reasonably well into the radio spectrum of H1 deduced from the 28 June 1973 radio maps analyzed in this report.