Abstract
Radiometric measurements of selected lunar areas are reported for the lunar eclipse of 18 October 1967. Observations were made simultaneously at 1.4- and 3.4-mm wavelenght on a common large-aperture antenna forming independent half-power antenna beamwidths of 1.78 and 3.3 arc min, respectively. Within the precision of the measurement, as limited by atmospheric variations and radiometer noise, there is no statistically significant difference between the cooling rates of any two lunar areas measured at 1.4 mm. Similarly, there is no statistically significant difference between the cooling rates of any two lunar areas measured at 3.4-mm. Temperature changes and cooling rates observed at 3.4 mm are in fair agreement with those measured on the same areas observed at 3.2-mm during the 30 December 1963 lunar eclipse. The lunar areas measured during both eclipse events are Copernicus, Mare Serenitatis, and a mountainous region.
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