Preliminary observations of solar radio sources with the Culgoora radioheliograph operating at four frequencies

Details Preliminary observations of solar radio sources with the Culgoora radioheliograph operating at four frequencies Preliminary observations of solar radio sources with the Culgoora radioheliograph operating at four frequencies

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...83..167s&link_type=abstract

Solar Physics, vol. 83, Feb. 1983, p. 167-177.

Physics

7

Solar Corona, Solar Radio Emission, Spectroheliographs, High Resolution, Sunspots, Type 3 Bursts

Scientific paper

The Culgoora radioheliograph has been modified for observing at 327.4 MHz, which is in addition to the three frequencies (43.25, 80, and 160 MHz) previously available. At the new frequency the array beamwidth is 56 arcsec, which represents the highest resolution yet available for metre-wavelength solar mapping. At 327.4 MHz the sources of radio emission are mainly in the lowest layers of the corona. Some preliminary four-frequency observations have been made of type I storms. It is found that the source size generally decreases with increasing observing frequency. This result confirms earlier suggestions that the sources of both type I and type III emission are contained in structures whose boundaries diverge outwards in the corona.

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