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Amazonian northern mid-latitude glaciation on Mars: A proposed climate scenario
Forget, F.; Montmessin, F.; Head, James W. +3 more
Recent geological observations in the northern mid-latitudes of Mars show evidence for past glacial activity during the late Amazonian, similar to the integrated glacial landsystems in the Dry Valleys of Antarctica. The large accumulation of ice (many hundreds of meters) required to create the observed glacial deposits points to significant atmosp…
The global martian volcanic evolutionary history
Werner, Stephanie C.
Viking mission image data revealed the total spatial extent of preserved volcanic surface on Mars. One of the dominating surface expressions is Olympus Mons and the surrounding volcanic province Tharsis. Earlier studies of the global volcanic sequence of events based on stratigraphic relationships and crater count statistics were limited to the im…
Analysis of Titan's neutral upper atmosphere from Cassini Ion Neutral Mass Spectrometer measurements
Waite, J. H.; Yelle, R. V.; Kasprzak, W. T. +10 more
In this paper we present an in-depth study of the distributions of various neutral species in Titan's upper atmosphere, between 950 and 1500 km for abundant species (N 2, CH 4, H 2) and between 950 and 1200 km for other minor species. Our analysis is based on a large sample of Cassini/INMS (Ion Neutral Mass Spectro…
Phosphine on Jupiter and Saturn from Cassini/CIRS
Fletcher, L. N.; Irwin, P. G. J.; Teanby, N. A. +1 more
The global distribution of phosphine (PH 3) on Jupiter and Saturn is derived using 2.5 cm -1 spectral resolution Cassini/CIRS observations. We extend the preliminary PH 3 analyses on the gas giants [Irwin, P.G.J., and 6 colleagues, 2004. Icarus 172, 37-49; Fletcher, L.N., and 9 colleagues, 2007a. Icarus 188, 72-88]…
Discovery of jarosite within the Mawrth Vallis region of Mars: Implications for the geologic history of the region
Glotch, Timothy D.; Farrand, William H.; Swayze, Gregg A. +2 more
Analysis of visible to near infrared reflectance data from the MRO CRISM hyperspectral imager has revealed the presence of an ovoid-shaped landform, approximately 3 by 5 km in size, within the layered terrains surrounding the Mawrth Vallis outflow channel. This feature has spectral absorption features consistent with the presence of the ferric sul…
Methane and its isotopologues on Saturn from Cassini/CIRS observations
Fletcher, L. N.; Irwin, P. G. J.; Teanby, N. A. +2 more
High spectral resolution observations from the Cassini Composite Infrared Spectrometer [Flasar, F.M., and 44 colleagues, 2004. Space Sci. Rev. 115, 169-297] are analysed to derive new estimates for the mole fractions of CH 4, CH 3D and 13CH 4 of (4.7±0.2)×10, (3.0±0.2)×10 and (5.1±0.2)×10 respectively. T…
Determining Titan surface topography from Cassini SAR data
Cassini RADAR Team; Stiles, Bryan W.; Kirk, Randolph L. +17 more
A technique, referred to as SARTopo, has been developed for obtaining surface height estimates with 10 km horizontal resolution and 75 m vertical resolution of the surface of Titan along each Cassini Synthetic Aperture Radar (SAR) swath. We describe the technique and present maps of the co-located data sets. A global map and regional maps of Xanad…
The volcanic history of central Elysium Planitia: Implications for martian magmatism
Mangold, N.; Pinet, P.; Baratoux, D. +3 more
Central Elysium Planitia (CEP) is located south of Elysium Mons. Back to the era of the Viking orbiters, clues accumulated in favor of recent volcanism in relation with ground water release and the formation of long sub-parallel fissures. Four aqueous flood channel systems emanate from linear fissures. Recent eruptions of low viscosity lavas origi…
The formation and evolution of youthful gullies on Mars: Gullies as the late-stage phase of Mars’ most recent ice age
Head, James W.; Dickson, James L.
Gullies are extremely young erosional/depositional systems on Mars that have been carved by an agent that was likely to have been comprised in part by liquid water [Malin, M.C., Edgett, K.S., 2000. Evidence for recent groundwater seepage and surface runoff on Mars. Science 288, 2330-2335; McEwen, A.S. et al., 2007. A closer look at water-related g…
Quantitative compositional analysis of martian mafic regions using the MEx/OMEGA reflectance data. 2. Petrological implications
Mangold, N.; Bibring, J. -P.; Gondet, B. +8 more
The primary objectives of this paper are to determine the modal mineralogy of selected low albedo terrains of different ages ranging from Noachian to Amazonian exposed on the surface of Mars. This analysis is conducted using the spectral modeling of the Observatoire pour la Minéralogie, l'Eau, les Glaces, et l'Activité (OMEGA) reflectance data. Re…