Search Publications
A Mars orbital catalog of aqueous alteration signatures (MOCAAS)
Bibring, Jean-Pierre; Langevin, Yves; Gondet, Brigitte +3 more
We describe the completion of the MOCAAS project providing a global repository of secondary minerals formed through interaction with water on Mars. This work is based on the analysis of orbital imaging spectroscopy data from the OMEGA/Mars Express and CRISM/MRO near-infrared instruments. A database and a set of high-resolution global maps (200 m/p…
Solar cycle variation of ion escape from Mars
Barabash, Stas; Nilsson, Hans; Zhang, Qi +6 more
Using Mars Express data from 2007 until 2020 we show how ion outflow from Mars varied over more than a solar cycle, from one solar minimum to another. The data was divided into intervals with a length of one Martian year, starting from 30 April 2007 and ending 13 July 2020. The net escape rate was about 5 × 1024s-1 in the fir…
The effects of atmospheric dust and solar radiation on the dayside ionosphere of Mars derived from 17 years of Mars Express radio science observations
Pätzold, M.; González-Galindo, F.; Witasse, O. +5 more
This work combines 17 years of Mars Express radio science (MaRS) observations with proxies for insolation and local/global atmospheric dust to investigate the combined and individual effects on the dayside ionosphere of Mars from the top down to the ionospheric base.
The increase in insolation from orbital apocenter to pericenter in combinati…Morphology and paleohydrology of intracrater alluvial fans north of Hellas Basin, Mars
Williams, Rebecca M. E.; Anderson, Ryan B.; Gullikson, Amber L. +1 more
Alluvial fans and sinuous ridges are both important records of the history of fluvial activity on Mars, and they often occur together. We present observations of alluvial fans, many of which exhibit inverted relief, in five craters in the region north of Hellas basin. The observed fans ranged in size from ~10 to 820 km2. We identified t…
The brightness of the CO Cameron bands in the martian discrete aurora: A study based on revised cross sections
Daerden, F.; Neary, L.; Gérard, J. -C. +2 more
We analyze the consequences of the new laboratory measurements of the emissions cross sections of the Cameron bands excited by electron impact on CO2 and CO in the Mars aurora. We use Monte Carlo simulations to investigate the importance of these changes and their dependence on the initial electron energy. The Mars Climate Database (MCD…
Differential apparent thermal inertia of sloping terrain on Mars: Implications for the magmatic intrusions at Olympus Mons
Ciazela, M.; Ciazela, J.; Pieterek, B.
Mars, which exhibits exceptionally high surface temperature gradients due to the lack of vegetation and thin atmosphere, is especially suitable for the DATI approach. Taking advantage of this Mars property, we propose a new DATI-based method for thermal inertia calculation on Mars based on albedo and short-time-intervals of temperature difference.…
An updated global survey of alluvial fans on Mars: Distinguishing alluvial fans from other fan-shaped features through morphologic characterization
Moersch, Jeffrey E.; Mondro, Claire A.; Fedo, Christopher M.
Alluvial fans formed on Mars during the late Hesperian to early Amazonian in a climatic transition from a time of regular surface water activity to the current dry and cold climate. The depositional environments recorded by alluvial fans represent the final era of potential habitability on the Martian surface. Alluvial fan deposits can often look …
Assessing slope uncertainties of martian Digital Elevation Models from numerical propagation of errors on synthetic geological surfaces
Quantin-Nataf, C.; Leyrat, C.; Millot, C. +2 more
Digital Elevation Models (DEM) are widely used in planetary sciences, including for the specific case of Mars. DEMs allow us to extract topography parameters necessary in geomorphological studies. However, DEMs are not free from vertical errors, which yields uncertainties in calculations of parameters such as local slopes. In addition, slope maps …
OMEGA/Mars Express: A new martian atmospheric dust hunter
Vincendon, Mathieu; Leseigneur, Yann
While dust is a key parameter of Mars climate, its behaviour from one year to the next can appear erratic. This variability is notably related to Global Dust Storms (GDS) which occur only certain years with different onset, duration and intensity. The interannual variabilities of the dust cycle may notably explain some characteristics of Recurring…
Ionosphere of Mars during the consecutive solar minima 23/24 and 24/25 as seen by MARSIS-Mars Express
Witasse, Olivier; Sánchez-Cano, Beatriz; Kofman, Wlodek +4 more
The Mars' ionospheric behavior during two consecutive solar minima (23/24 and 24/25) is investigated with the same dataset. In particular, we use the Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) on board Mars Express to investigate the total electron content behavior of the whole atmosphere in relation to the solar irradian…