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The Spatial and Temporal Distribution of Nighttime Ozone and Sulfur Dioxide in the Venus Mesosphere as Deduced From SPICAV UV Stellar Occultations
Montmessin, F.; Korablev, O.; Bertaux, J. -L. +5 more
The nighttime ozone and sulfur dioxide distributions were analyzed using the entire Spectroscopy for the Investigation of the Characteristics of the Atmosphere of Venus (SPICAV) UV/Venus Express stellar occultation data set. After the discovery of an ozone layer at 100 km in the mesosphere reported by Montmessin, Bertaux, et al. (2011,
Does Phobos Reflect Solar Wind Protons? Mars Express Special Flyby Operations With and Without the Presence of Phobos
Barabash, Stas; Holmström, Mats; Futaana, Yoshifumi +1 more
We characterize the solar wind proton reflection (backscattering) from Phobos using a series of Mars Express operations. The plasma data obtained during the Phobos flyby of Mars Express in January 2016 showed a non-solar wind signal possibly reflected from the Phobos surface. Similar signatures were previously reported during an earlier Phobos fly…
Geological History of Southeastern Gorgonum Chaos, Mars: A Story of Water and Wind
Hauber, Ernst; Adeli, Solmaz; Haack, David
Gorgonum Chaos is part of the Eridania paleolake in Terra Sirenum and displays a number of prominent light-toned morphological features that bear a record of the regional climatic conditions throughout most of Martian history. Based on an intergrated analysis of orbital data, we mapped a 1,500 km2 area in the southeast of Gorgonum Chaos…
Evaluating Flat-Crater Floor Fill Compositions and Morphologies: Insight Into Formation Processes
Rogers, A. D.; Pan, C.; Edwards, C. S.
Numerous impact craters on Mars have been deeply filled, raising questions about the potential processes that contributed to infilling. Previously proposed processes include ponding of impact melt, aeolian sedimentation, lacustrine sedimentation, or volcanic infilling. Better constraints on the infilling processes of flat floor craters are needed …
Controls on the Global Distribution of Martian Landslides
Ehlmann, Bethany L.; Roback, Kevin P.
Recent acquisition of high resolution satellite imagery of the Martian surface has permitted landslides to be studied on a global scale on Mars for the first time. We apply the Scoops3D software package to compute slope stability for select regions of the Martian surface, combining calculations of slope stability with number of observed landslides…
Ripples, Transverse Aeolian Ridges, and Dark-Toned Sand Dunes on Mars: A Case Study in Terra Sabaea
Lu, Y.; Edgett, K. S.; Wu, Y. Z.
Ripples, transverse aeolian ridges (TARs), and dark-toned sand sheets and dunes are common aeolian bedforms on the Martian surface. They are important for understanding the nature of present-day Martian sediments and regional aeolian processes. Here we present a case study investigation of ripples, TARs, a dark-toned sand sheet, and dunes in an un…
Evidence of Regionally Distributed Tectono-Volcanism in a Floor Fractured Crater of North-Central Arabia Terra, Mars
Komatsu, G.; Rani, A.; Basu Sarbadhikari, A. +3 more
Arabia Terra features many tectonic structures, which have been correlated to episodes of incipient tectonics, massive impacts, and controls on fluvial systems. However, the extent of regionally distributed tectono-volcanism and its effects on local structures remains unknown. To characterize the prevalence of volcanically driven processes in this…