Search Publications
Relative contributions of sublimation and volcanoes to Io's atmosphere inferred from its plasma interaction during solar eclipse
Saur, Joachim; Strobel, Darrell F.
We present a model that describes Io's delayed electrodynamic response to a temporal change in Io's atmosphere. Our model incorporates the relevant physical processes involved in Io's atmosphere-ionosphere-magnetosphere electrodynamic interaction to predict the far-ultraviolet (FUV) radiation as Io enters Jupiter's shadow and re-emerges into sunli…
Jovian auroral spectroscopy with FUSE: analysis of self-absorption and implications for electron precipitation
Feldman, P. D.; Moos, H. W.; Roueff, E. +12 more
High-resolution ( ∼0.22 Å) spectra of the north jovian aurora were obtained in the 905-1180 Å window with the Far Ultraviolet Spectroscopic Explorer (FUSE) on October 28, 2000. The FUSE instrument resolves the rotational structure of the H 2 spectra and the spectral range allows the study of self-absorption. Below 1100 Å, transitions co…
Titan's surface and rotation: new results from Voyager 1 images
McEwen, Alfred; Lorenz, Ralph D.; Richardson, James
We present an analysis of images of Saturn's moon Titan, obtained by the Voyager 1 spacecraft on November 8-12, 1980. Orange filter (590-640 nm) images were photometrically corrected and a longitudinal average removed from them, leaving residual images with up to 5% contrast, and dominated by surface reflectivity. The resultant map shows the same …
Evidence for temporal change at Uranus' south pole
Hammel, H. B.; Rages, K. A.; Friedson, A. J.
Analysis of Hubble Space Telescope images of Uranus taken between 1994 and 2002 shows evidence for temporal changes in zonal brightness patterns in the south polar region. Between 1994 and 2002, a relatively bright ring developed near 70° S. The pole itself, which was the brightest area of the southern hemisphere in 1994, has become relatively dar…
Study of the vertical structure of Saturn's atmosphere using HST/WFPC2 images
Moreno, F.; Grodent, D.; Dols, V. +3 more
We have studied the vertical structure of hazes at six different latitudes (-60°, -50°, -30°, -10°, +30°, and +50°) on Saturn's atmosphere. For that purpose we have compared the results of our forward radiative transfer model to limb-to-limb reflectivity scans at four different wavelengths (230, 275, 673.2, and 893 nm). The images were obtained wi…
Orbits and masses of Saturn's coorbital and F-ring shepherding satellites
French, Richard G.; Jacobson, Robert A.
We have obtained numerically integrated orbits for Saturn's coorbital satellites, Janus and Epimetheus, together with Saturn's F-ring shepherding satellites, Prometheus and Pandora. The orbits are fit to astrometric observations acquired with the Hubble Space Telescope and from Earth-based observatories and to imaging data acquired from the Voyage…
The UV environment of the Beagle 2 landing site: detailed investigations and detection of atmospheric state
Zarnecki, John C.; Cockell, Charles S.; Patel, Manish R. +2 more
December 25th 2003 will see the Beagle 2 lander arrive at the surface of Mars in the Isidis region, allowing for the first time in situ measurements of ultraviolet (UV) flux directly from the surface of Mars through the use of a sensor designed as part of a miniaturised environmental package. The expected conditions the sensor will experience are …
Europa's opposition surge in the near-infrared: interpreting disk-integrated observations by Cassini VIMS
Buratti, Bonnie J.; Simonelli, Damon P.
Near-infrared observations of Europa's disk-integrated opposition surge by Cassini VIMS, first published in Fig. 4 of Brown et al. (2003, Icarus, 164, 461), have now been modeled with the commonly used Hapke photometric function. The VIMS data set emphasizes observations at 16 solar phase angles from 0.4° to 0.6°—the first time the <1° phase "h…
Upper limits on hydrogen halides in Jupiter from Cassini/CIRS observations
Nixon, Conor A.; Irwin, Patrick G. J.; Fouchet, Thierry +2 more
We have determined the following upper limits for the mole fraction of hydrogen halides in Jupiter's atmosphere from Cassini/CIRS observations: [HF] <2.7×10 -11, [HCl] <2.3×10 -9, [HBr] <1.0×10 -9, [HI] <7.6×10 -9. These limits are smaller than solar composition for HF and HCl, and support th…
Cassini/VIMS observation of an Io post-eclipse brightening event
Brown, R. H.; Baines, K. H.; Buratti, B. J. +10 more
During the Cassini-Jupiter flyby, VIMS observed Io at different phase angles, both in full sunlight and in eclipse. By using the sunlight measurements, we were able to produce phase curves in the visual through all the near infrared wavelengths covered by the VIMS instrument (0.85-5.1 µm). The phase angle spanned from ∼2° to ∼120°. The measu…