Search Publications
Photometric analysis of 1 Ceres and surface mapping from HST observations
Parker, Joel Wm.; Stern, S. Alan; Russell, Christopher T. +5 more
The highest resolution (pixel scale 30 km) images of Ceres to date have been acquired by the Advanced Camera for Surveys onboard Hubble Space Telescope, through three wide band filters, centered at 535, 335, and 223 nm, covering more than one rotation of Ceres. The lightcurve at 535 nm agrees with earlier observations at V-band [Tedesco, E.F., Tay…
Subvisible CO 2 ice clouds detected in the mesosphere of Mars
Montmessin, Franck; Bertaux, Jean-Loup; Perrier, Séverine +8 more
The formation of CO 2 ice clouds in the upper atmosphere of Mars has been suggested in the past on the basis of a few temperature profiles exhibiting portions colder than CO 2 frost point. However, the corresponding clouds were never observed. In this paper, we discuss the detection of the highest clouds ever observed on Mars…
Europa's atmosphere, gas tori, and magnetospheric implications
Smyth, William H.; Marconi, Max L.
A two-dimensional kinetic model calculation for the water group species (H 2O, H 2, O 2, OH, O, H) in Europa's atmosphere is undertaken to determine its basic compositional structure, gas escape rates, and velocity distribution information to initialize neutral cloud model calculations for the most important gas to…
Latitudinal variations of HCN, HC 3N, and C 2N 2 in Titan's stratosphere derived from Cassini CIRS data
Fletcher, L.; Irwin, P. G. J.; Teanby, N. A. +9 more
Mid- and far-infrared spectra from the Composite InfraRed Spectrometer (CIRS) have been used to determine volume mixing ratios of nitriles in Titan's atmosphere. HCN, HC 3N, C 2H 2, and temperature were derived from 2.5 cm -1 spectral resolution mid-IR mapping sequences taken during three flybys, which p…
Jupiter's atmospheric temperatures: From Voyager IRIS to Cassini CIRS
Achterberg, Richard K.; Flasar, F. Michael; Simon-Miller, Amy A. +4 more
Retrievals performed on Cassini Composite Infrared Spectrometer data obtained during the distant Jupiter flyby in 2000/2001 have been used to generate global temperature maps of the planet in the troposphere and stratosphere, but to higher latitudes than were shown previously by Flasar et al. [Flasar, F.M., 39 colleagues, 2004a. Nature 427, 132-13…
Carbon dioxide photoelectron energy peaks at Mars
Coates, A. J.; Kallio, E.; Fedorov, A. +40 more
The ELectron Spectrometer (ELS) from the Analyzer of Space Plasmas and Energetic Atoms (ASPERA-3) flown on the Mars Express spacecraft has an 8% energy resolution, combined with the capability to oversample the martian electron distribution. This makes possible the resolution and identification of electrons generated as a result of the He 304 Å io…
Interaction between eddies and mean flow in Jupiter's atmosphere: Analysis of Cassini imaging data
Ingersoll, Andrew P.; Del Genio, Anthony D.; Vasavada, Ashwin +2 more
Beebe et al. [Beebe, R.F., et al., 1980. Geophys. Res. Lett. 17, 1-4] and Ingersoll et al. [Ingersoll, A.P., et al., 1981. J. Geophys. Res. 86, 8733-8743] used images from Voyagers 1 and 2 to analyze the interaction between zonal winds and eddies in Jupiter's atmosphere. They reported a high positive correlation between Jupiter's eddy momentum flu…
Mass composition of the escaping plasma at Mars
Coates, A. J.; Kallio, E.; Fedorov, A. +44 more
Data from the Ion Mass Analyzer (IMA) sensor of the ASPERA-3 instrument suite on Mars Express have been analyzed to determine the mass composition of the escaping ion species at Mars. We have examined 77 different ion-beam events and we present the results in terms of flux ratios between the following ion species: CO +2/O
Production, ionization and redistribution of O 2 in Saturn's ring atmosphere
Luhmann, J. G.; Tokar, R. L.; Johnson, R. E. +10 more
Molecular oxygen produced by the decomposition of icy surfaces is ubiquitous in Saturn's magnetosphere. A model is described for the toroidal O 2 atmosphere indicated by the detection of O2+ and O + over the main rings. The O 2 ring atmosphere is produced primarily by UV photon-induced decomposition of ice on the s…
The vertical structure of Titan's upper atmosphere from Cassini Ion Neutral Mass Spectrometer measurements
Waite, J. H.; Kasprzak, W. T.; Müller-Wodarg, I. +4 more
Data acquired by the Ion Neutral Mass Spectrometer (INMS) on the Cassini spacecraft during its close encounter with Titan on 26 October 2004 reveal the structure of its upper atmosphere. Altitude profiles of N 2, CH 4, and H 2, inferred from INMS measurements, determine the temperature, vertical mixing rate, and es…