Abstract
THERMAL radio emission from Mars was first detected by Mayer, McCullough and Sloanaker during the favourable opposition of 1956 at 3.15 cm (ref. 1). Further observations at this wave-length made near the opposition of 1958 with improved accuracy gave an equivalent black-body temperature of 211° ± 20° K (ref. 2). In 1962 Drake measured a value of 177° ± 17° K for the temperature at 10 cm (ref. 3). These temperatures are somewhat lower than the infra-red temperatures of 230° to 260° K determined by several workers4–6.
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