Search Publications
Geomorphic evidence for former lobate debris aprons at low latitudes on Mars: Indicators of the Martian paleoclimate
Neukum, G.; Hauber, E.; van Gasselt, S. +1 more
Circumferential depressions enclosing mesas and plateaus in the northern Kasei Valles and in the Tartarus Colles regions of Mars are interpreted as indicators of the former extent of lobate debris aprons, thought to be mixtures of ice and clastic particles. These former lobate debris aprons existed about 1 Ga ago and were embayed by lavas or other…
Geomorphic study of fluvial landforms on the northern Valles Marineris plateau, Mars
Mangold, N.; Quantin, C.; Neukum, G. +2 more
Fluvial landforms are observed on the plateau near Echus Chasma and other locations on the Valles Marineris plateau using high resolution (10 to 50 m/pixel) Mars Express images and topography. Branching valleys have a 20- to 100-m deep V-shape profile typical of fluvial processes. Their incision occurred in a thin (<150 m) and weak, dark unit t…
Mobile lid convection beneath Enceladus' south polar terrain
Barr, Amy C.
Enceladus' south polar region has a large heat flux, 55-110 mW m-2, that is spatially associated with cryovolcanic and tectonic activity. Tidal dissipation and vigorous convection in the underlying ice shell are possible sources of heat, however, prior predictions of the heat flux carried by stagnant lid convection range from F con…
Titan's winter polar vortex structure revealed by chemical tracers
Irwin, P. G. J.; Teanby, N. A.; Calcutt, S. B. +10 more
The winter polar vortex on Saturn's largest moon Titan has profound effects on atmospheric circulation and chemistry and for the current northern midwinter season is the major dynamical feature of Titan's stratosphere and mesosphere. We use 2 years of observations from Cassini's composite infrared spectrometer to determine cross sections of five i…
Mapping and interpretation of Sinlap crater on Titan using Cassini VIMS and RADAR data
Sotin, Christophe; Barnes, Jason W.; Le Mouélic, Stéphane +15 more
Only a few impact craters have been unambiguously detected on Titan by the Cassini-Huygens mission. Among these, Sinlap is the only one that has been observed both by the RADAR and VIMS instruments. This paper describes observations at centimeter and infrared wavelengths which provide complementary information about the composition, topography, an…
Geological context of water-altered minerals in Valles Marineris, Mars
Hynek, Brian M.; Chojnacki, Matthew
Greater than 15,000 km2 of the layered deposits within Valles Marineris are associated with water-altered minerals, yet their origin and history of alteration remain a mystery. There are numerous competing hypotheses for the formation of the interior layered deposits including aeolian, lacustrine, and volcanic. Recent orbiter spectrosco…
Stratigraphy and structure of interior layered deposits in west Candor Chasma, Mars, from High Resolution Stereo Camera (HRSC) stereo imagery and derived elevations
Scholten, F.; Neukum, G.; Hauber, E. +5 more
Interior layered deposits (ILDs) within western Candor Chasma were studied by mapping lithologies, measuring layer attitudes and comparing the stratigraphy of two adjacent mounds. Layering tends to dip in the same direction as the local topographic slope, although at different angles. Regionally consistent attitudes do exist, suggesting postdeposi…
Characterization of mesoscale gravity waves in the upper and lower clouds of Venus from VEX-VIRTIS images
Hueso, R.; Sánchez-Lavega, A.; Drossart, P. +3 more
Images obtained from the Visible and InfraRed Thermal Imaging Spectrometer (VIRTIS)-M instrument onboard Venus Express present visible trains of alternating bands of cloud brightness in two different layers: at the upper cloud tops (~66 km altitude) observed in the dayside hemisphere using reflected ultraviolet light (380 nm) and in the lower clou…
Composition of the Venus mesosphere measured by Solar Occultation at Infrared on board Venus Express
Vandaele, A. C.; Montmessin, F.; Fedorova, A. +8 more
Solar Occultation at Infrared (SOIR), which is a part of the Spectroscopy for Investigation of Characteristics of the Atmosphere of Venus (SPICAV) instrument on board Venus Express, combines an echelle-grating spectrometer with an acoustooptical tunable filter. It performs solar occultation measurements in the IR region at a high spectral resoluti…
Relative age of interior layered deposits in southwest Candor Chasma based on high-resolution structural mapping
Kirk, Randolph L.; McEwen, Alfred S.; Okubo, Chris H. +1 more
High-resolution topography generated from stereo HiRISE (High-Resolution Imaging Science Experiment) imagery reveals the meter-scale structure of interior layered deposits (ILD) in southwest Candor Chasma. This study seeks to determine the age of the local ILD relative to any normal faults that can be attributed to chasma formation. The study area…