Meterwave observations of a coronal hole

Details Meterwave observations of a coronal hole Meterwave observations of a coronal hole

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..111..419w&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 111, no. 2, 1987, p. 419-428.

Physics

9

Coronal Holes, Electron Density (Concentration), Radio Observation, Ultraviolet Spectra, Density Distribution, Temperature Distribution

Scientific paper

Meter-wave maps showing a coronal hole at 30.9, 50.0, and 73.8 MHz are presented using the Clark Lake Radioheliograph in October 1984. The coronal hole seen against the disk at all three frequencies shows interesting similarities to, and significant differences from, its optical signatures in He I 10830 A spectroheliograms. Using the model of coronal holes by Dulk et al. (1977), the electron density is derived from the radio observations of the brightness temperature. The discrepancy between the density value derived from the Skylab EUV data and that computed from the present radio data is even larger than in Dulk et al.'s comparison at similar and higher frequencies.

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