Far infrared and submillimeter observations of the giant planets

Astronomy and Astrophysics – Astronomy

Scientific paper

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Far Infrared Radiation, Gas Giant Planets, Infrared Spectra, Photometry, Planetary Atmospheres, Planetary Environments, Submillimeter Waves, Atmospheric Models, Brightness, Calibrating, Infrared Telescopes, Spectral Bands

Scientific paper

Far infrared measurements of the effective temperatures of Jupiter, Saturn, Uranus and Neptune were made. The measurements presented here cover the range from 35-1000 micrometers in relatively narrow bands. The observations at lambda 350 micrometers were made at the 3m NASA Infrared Telescope Facility (IRTF) of the Mauna Kea Observatory; those at lambda 350 micrometer were made on the Kuiper Airborne Observatory (KAO). All observations of Saturn were made when the ring inclination to Earth was 1.7 deg assuring an unambiguous measurement of the flux from the disk itself. Mars was used as the calibration reference. The results represent a consistent set of calibration standards. In these measurements, it is assumed thatb(lambda = 350 micrometers) = T(lambda 350 micrometers). Measurements have been made of roughly 50% of the total flux emitted by Jupiter, 65% by Saturn, and 92% by Uranus and Neptune. These measurements therefore permit a considerable reduction in the uncertainties associated with the bolometric thermal outputs of the planets. The effective temperatures (Te) and the ratios of emitted to absorbed solar radiation were calculated.

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