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Hydrocarbons in the upper atmosphere of Saturn are known, from Voyager, ground-based, and early Cassini results, to vary in emission intensity with latitude. Of particular interest is the marked increase in hydrocarbon line intensity near the south pole during southern summer, as the increased line intensity cannot be simply explained by the increased temperatures observed in that region since the...
Highly accurate astrometric positions obtained from eclipses and occultations of planetary satellites are reported. These measurements may be used to test existing ephemerides, to improve upon them, and to fit system constants such as satellite masses and planetary zonal harmonics. Eclipse and occultation photometry of 5 uranian satellite mutual events has resulted in precise astrometry for 3 of these...
Ethylene (C 2 H 4 ) emission has been measured in the poles and equator of Jupiter. The 949 cm −1 spectra were recorded with a high resolution spectrometer at the McMath–Pierce telescope at Kitt Peak in October–November 1998 and at the Infrared Telescope Facility at Mauna Kea in June 2000. C 2 H 4 is an important product of methane chemistry in the outer planets...
We have performed high-resolution spectral observations at mid-infrared wavelengths of C 2 H 6 (12.16 μm), and C 2 H 2 (13.45 μm) on Saturn. These emission features probe the stratosphere of the planet and provide information on the hydrocarbon photochemical processes taking place in that region of the atmosphere. The observations were performed using our cryogenic...
We present an analysis of new cloud motion measurements in Saturn's atmosphere from Voyager 1 and 2 images and define a nominal zonal wind velocity vs latitude profile for the cloud top level that can be used as reference for the upcoming Cassini mission. Improvements over previous studies include: (i) twice the number of wind vectors used, (ii) independent measurements of cloud tracers, (iii) extended...
We have performed high-resolution spectral observations at mid-infrared wavelengths of CH 4 (8.14 μm), C 2 H 6 (12.16 μm), and C 2 H 2 (13.45 μm) on Jupiter. These emission features probe the stratosphere of the planet and provide information on the carbon-based photochemical processes taking place in that region of the atmosphere. The observations were performed...
Spectroscopic observations of Jupiter at thermal–infrared wavelengths were performed on November 8–9 and December 14, 1994, 16 and 21 weeks after the fragments of comet Shoemaker–Levy 9 collided with Jupiter. Residual stratospheric ammonia was searched for in emission at 930.76 cm −1 over the longitudes corresponding to the remnants of the D/G/R/S impact sites. We believe a small amount of...
We report on a new series of ground-based CCD observations at visual wavelengths, covering a period of 1255 days between May 1992 and November 1995, of the longest-lived asymmetric feature known in Saturn's atmosphere: the north polar spot (NPS). This completes our previous analysis of this feature during the period 1990–1991 (A. Sanchez-Lavega, J. Lecacheux, F. Colas, and P. Lagues, 1993,Science260,329–332)...
We have consistently navigated the highest resolution images available of Jupiter's Great Red Spot (GRS) from the Voyager ISS experiment. From them we have measured apparent displacements of cloud features around and within the Red Spot which can be interpreted as wind vectors. We have used the wind field information to determine the circulation characteristics of the collar and to map the relative...
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