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=1987sici.symp...24w&link_type=abstract

In Alabama Univ., Huntsville. STIP Symposium on Physical Interpretation of Solar/Interplanetary and Cometary Intervals p 24 (SEE

Physics

Coronal Holes, Interplanetary Medium, Intervals, Microwave Emission, Solar Corona, Brightness Temperature, Calibrating, Electron Density (Concentration), Mapping, Models, Sensitivity, Spectroheliographs

Scientific paper

Meter-wave maps are presented showing a coronal hole at 30.9, 50.0, and 73.8 MHz 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 HeI lambda10830 spectroheliograms. The 73.8 MHz coronal hole, when seen near disk center, appears to coincide with the HeI footprint of the hole. At the lower frequencies, the emission comes from higher levels of the corona, and the hole appears to be displaced, probably due to the non-radial structure of the coronal hole. The contrast of the hole relative to the quiet Sun is much greater than reported previously for a coronal hole observed at 80 MHz. The higher contrast is certainly real, due to the superior dynamic range, sensitivity, and calibration of the Clark Lake instrument. Using a coronal hole model, the electron density is derived from radio observations of the brightness temperature. A very large discrepancy is found between the derived density and that determined from Skylab EUV observations of coronal holes. This discrepancy suggests that much of the physics of coronal holes has yet to be elucidated.

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