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The Venusian surface has been studied by measuring radar reflections andthermal radio emission over a wide spectral region of several centimeters tometer wavelengths from the Earth-based as well as orbiter platforms. Theradiometric observations, in the decimeter (dcm) wavelength regime showed adecreasing trend in the observed brightness temperature (Tb) with increasingwavelength. The thermal emission models available at present have not been ableto explain the radiometric observations at longer wavelength (dcm) to asatisfactory level. This paper reports the first interferometric imagingobservations of Venus below 620 MHz. They were carried out at 606, 332.9 and239.9 MHz using the Giant Meterwave Radio Telescope (GMRT). The Tb valuesderived at the respective frequencies are 526 K, 409 K and < 426 K, with errorsof ~7% which are generally consistent with the reported Tb values at 608 MHzand 430 MHz by previous investigators, but are much lower than those derivedfrom high-frequency observations at 1.38-22.46 GHz using the VLA.

Radio Observation of Venus at Meter Wavelengths using the GMRT