The submillimeter spectra of the planets - Narrow-band photometry

Details The submillimeter spectra of the planets - Narrow-band photometry The submillimeter spectra of the planets - Narrow-band photometry

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981icar...48..127c&link_type=abstract

Icarus, vol. 48, Oct. 1981, p. 127-139.

Physics

Optics

28

Atmospheric Models, Brightness Temperature, Emission Spectra, Infrared Spectra, Planetary Atmospheres, Spectrophotometry, Submillimeter Waves, Atmospheric Optics, Calibrating, Data Reduction, Far Infrared Radiation, Microwaves, Water Vapor, Planets, Spectra, Photometry, Wavelengths, Jupiter, Saturn, Techniques, Mars, Uranus, Opacity, Rings, Brightness, Emissions, Comparisons, Equipment, Earth-Based Observations, Calculations, Procedure, Atmosphere, Models

Scientific paper

Narrow-band, multicolor submillimeter photometric observations of Jupiter, Saturn, Mars and Uranus are reported. Observations were made at the 3.8-m UKIRT at Mauna Kea at wavelengths of 381, 652 and 962 microns on a night of exceptionally low water vapor. The Saturnian system was observed at a time when the rings were virtually edge-on, allowing a disk brightness temperature to be obtained without significant ring contamination. The disk spectrum is found to be in good agreement with the model atmosphere of Klein et al. (1978), while comparison with observations at different ring inclinations reveals a rapid drop in ring emissivity and optical depth near 1 mm. Observations of Uranus show a dramatic increase in brightness temperature from the far-infrared to the microwave regions, and can be fit by the models of Danielson et al. (1977) and Gulkis et al. (1978). The spectrum of Jupiter shows a smooth transition from the far-infrared to the microwave, in satisfactory agreement with the available models. Consistency of the data supports the use of Mars as the prime calibrator. A method for determining atmospheric opacity from a single set of multicolor observations of a calibration source has also been verified.

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