view Abstract Citations (25) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Observations of Jupiter and Mars at 3-cm wave length. Giordmaine, J. A. ; Alsop, L. E. ; Townes, C. H. ; Mayer, C. H. Abstract Radiation associated with the planet Jupiter in the wave length range 3.03 to 3.37 cm has been observed during the period April 16, 1958 to February 7, 1959. The observations were made with the U. S. Naval Research Laboratory 50-foot reflector in conjunction with a maser amplifier (Giordmaine et al. 1959). A total of 153 drift curves through the position of the planet was obtained. The following are the average equivalent black body temperatures of the visible disc observed in the several wave length ranges: 3.36 ~ 0.01 cm, April 16 to May 8, 1958 with the exception of April 30to May 1, 189 ~ ~o0K; 3.17 + 0.02 cm, May 24 to July 29, 1958 and January 31 to February 7, 1959, 173 + ~o0K; 3.03 cm, August 22 to September 4, 1958, 171 + 200K. The probable errors quoted for the black body temperatures are mainly those arising from the uncertainty in the effective aperture of the reflector, and the relative precision of the measurements is considerably higher. There is evidence of an anomalously high temperature, approximately 2680K, on April 30 to May 1, 1958. The observed radiation is interpreted as thermal emisssion from ammonia in the region near the top of the cloud layer. The gaseous ammonia radiates through the inversion line at 1.28 cm, pressure broadened in the presence of hydrogen and helium. Thermal radiation from lower levels in the atmosphere probably accounts for an appreciable fraction of the higher temperature radiation reported at longer wave lengths in the centimeter and decimeter region. Radiation associated with the planet Mars was observed at 3.14 cm, on December 22, 1958. The equivalent black body temperature was 211 + 280K, in good agreement with previous measurements at this wavelength. Individual drift curves with peak antenna temperatures of about o.o80K were averaged in this work. REFERENCE Giordmaine, J. A. et al. 1959, Proc. Inst. Radio Engrs. 47, 1062. Columbia University New Vork, N. V. and Radio Astronomy Branch, U. S. Naval Research Laboratory Washington, D. C. Publication: The Astronomical Journal Pub Date: 1959 DOI: 10.1086/108048 Bibcode: 1959AJ.....64S.332G full text sources ADS |