Search Publications
Topographic and morphologic characteristics of Reull Vallis, Mars: Implications for the history of the Reull Vallis fluvial system
Neukum, G.; Ivanov, M. A.; Kostama, V. -P. +4 more
The eastern rim region of Hellas basin is characterized by the four prominent and quite extensively researched (cf. Crown et al., 2005, and references therein) outflow channels. In this work we focus on the Reull Vallis. On the basis of observations from available data sets, we present a hypothesis for the evolution of Reull Vallis and its complim…
Cold-climate modification of Martian landscapes: A case study of a spatulate debris landform in the Hellas Montes Region, Mars
Neukum, G.; Hauber, E.; van Gasselt, S.
We use spaceborne image and topographic data of Mars for a geomorphological study of the origin, development, and postemplacement modification of a 30-km-long spatulate landform in the Hellas Montes area, east of Hellas Planitia. The area is characterized by an abundance of lobate debris aprons, all of which have been interpreted as a result of cr…
Predictions of the electrical conductivity and charging of the aerosols in Titan's nighttime atmosphere
Tripathi, S.; Whitten, R. C.; Borucki, W. J.
The electrical conductivity and electrical charge on Titan's atmosphere are computed for altitudes between 0 and 400 km on the nightside for which the main source of ionization is galactic cosmic rays (GCR). Unlike the dayside, electrical charging of the aerosol particles at night is not only negative but also time-dependent. Hence a time-dependen…
Tectonic evolution of the eastern margin of the Thaumasia Plateau (Mars) as inferred from detailed structural mapping and analysis
Di Achille, G.; Ori, G. G.; Borraccini, F. +1 more
The eastern margin of the Thaumasia Plateau (EMTP) is characterized by a diversity of tectonic features, which recorded its complex, and still controversial, tectonic history. A detailed structural survey and analyses have been carried out in order to assess the kinematics and relative age of the main deformational events. Combining results from s…
The 2-µm spectroscopy of Huygens probe landing site on Titan with Very Large Telescope/Nasmyth Adaptive Optics System Near-Infrared Imager and Spectrograph
Drossart, P.; Gendron, E.; Rannou, P. +5 more
Several ground-based telescopes followed the event of the Huygens probe descent through Titan's atmosphere (14 January 2005). We used the Nasmyth Adaptive Optics System Near-Infrared Imager and Spectrograph (NACO) adaptive optics system at the UT-4 of the Very Large Telescope in Chile to perform both spectroscopic and imaging measurements of Titan…
Titan: Atmospheric and surface features as observed with Nasmyth Adaptive Optics System Near-Infrared Imager and Spectrograph at the time of the Huygens mission
Drossart, P.; Gendron, E.; Rannou, P. +5 more
At the time of the Huygens probe descent in Titan's atmosphere, on 14 January 2005, many ground-based telescopes were pointed toward Saturn's satellite. Here, we describe the data collected on 15 and 16 January with Nasmyth Adaptive Optics System Near-Infrared Imager and Spectrograph (NACO) at the Very Large Telescope. We acquired adaptive optics …
Modeling quasi-specular scattering from the surface of Titan
Tyler, G. Leonard; Sultan-Salem, Ahmed K.
The Cassini spacecraft obtained several scattering observations of the surface of Titan. Four data sets, TA-Inbound, TA-Outbound, T3-Outbound, and T8-Inbound, include scatterometer data for small angles of incidence. Analysis of these data sets provides an example use of a new generalized fractal-based quasi-specular scattering law that gives the …
Introduction to special section: OMEGA/Mars Express Mars Surface and Atmospheric Properties
Bibring, Jean-Pierre
Abstract Available from http://www.agu.org
Orientation and distribution of recent gullies in the southern hemisphere of Mars: Observations from High Resolution Stereo Camera/Mars Express (HRSC/MEX) and Mars Orbiter Camera/Mars Global Surveyor (MOC/MGS) data
Mangold, Nicolas; Neukum, Gerhard; Balme, Matthew +5 more
Geologically recent small gullies on Mars display morphologies consistent with erosion by water or by debris flows. Suggested formation models are divided into two main categories: (1) groundwater or (2) melting of near-surface ice/snow sourced from the atmosphere. We have measured location and orientation and recorded the local contexts of gullie…
Nature and origin of the hematite-bearing plains of Terra Meridiani based on analyses of orbital and Mars Exploration rover data sets
Bibring, J. -P.; Arvidson, R. E.; Gondet, B. +23 more
The ~5 km of traverses and observations completed by the Opportunity rover from Endurance crater to the Fruitbasket outcrop show that the Meridiani plains consist of sulfate-rich sedimentary rocks that are largely covered by poorly-sorted basaltic aeolian sands and a lag of granule-sized hematitic concretions. Orbital reflectance spectra obtained …