Unusually low coronal radio emission at the solar minimum

Details Unusually low coronal radio emission at the solar minimum Unusually low coronal radio emission at the solar minimum

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..140...19t&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 140, no. 1, July 1992, p. 19-39. Research supported by University of Maryland.

Physics

17

Brightness Temperature, Solar Corona, Solar Radio Emission, Sunspots, Light Scattering, Solar Activity, Solar Limb, Thermal Emission

Scientific paper

The paper reports 2D observations of the quiet sun at 73.8, 50.0, and 38.5 MHz obtained with the Clark Lake Radioheliograph during the sunspot minimum period of September 1986. The observed peak brightness temperatures during the entire period of sunspot minimum are found to be extremely low, lying in the range (0.6-2.5 x 10 exp 5 K). It is shown that these low values cannot be explained by the generally adopted models for Ne and Te in a homogeneous corona. The effect of scattering by random density fluctuations is introduced in order to decrease the values of predicted Tb. The value of peak Tb is computed as a function of relative rms density fluctuations, and the fluctuations should be in the range from 0.07 to 0.19, 0.1 to 0.25, and 0.15 to 0.35, respectively, at 38.5, 50.0, and 73.8 MHz, respectively, to explain the observed low brightness temperatures.

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