Measurements are reported which indicate that the microwave brightness temperature of Uranus near 3 cm wavelength has increased by about 35% in the past decade. It is suggested that changes of this magnitude could be caused by seasonal or latitudinal variations of the microwave opacity of the Uranus atmosphere. The data appear to be inconsistent with models of synchrotron emission from a trapped radiation belt.
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Klein et al. (1978) studied this question.
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