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Science 1 October 1976:
Vol. 194. no. 4260, pp. 107 - 109
DOI: 10.1126/science.194.4260.107
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Articles

Jupiter's Spectrum Between 12 and 24 Micrometers

H. H. AUMANN 1 and G. S. ORTON 1

1 Jet Propulsion Laboratory, California Institute of Technology, Pasadena 91103

Spectroscopic measurements of the thermal radiation from Jupiter between 12 and 24 micrometers (420 to 840 reciprocal centimeters) with a resolution of 4 reciprocal centimeters are used to infer the Jovian temperature structure in the pressure region 0.1 to 0.4 atmosphere. The brightness temperature spectrum is in good agreement with previous ground-based measurements between 11 and 13 micrometers and with airborne measurements between 18 and 25 micrometers. However, the integrated flux calculated for a filter window and viewing angle equivalent to those of the 20 micrometer channel of Pioneer 10 is 20 percent below that measured by the Pioneer infrared radiometer. The Q branch of the v5 fundamental band of acetylene at 730 reciprocal centimeters appears in emission and leads to a mixing ratio estimate of 10–6 ± 0.5.

Submitted on April 5, 1976
Revised on July 6, 1976


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Science. ISSN 0036-8075 (print), 1095-9203 (online)