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An Extremely Elongated Cloud Over Arsia Mons Volcano on Mars: I. Life Cycle
Gondet, B.; Jaumann, R.; Hueso, R. +12 more
We report a previously unnoticed annually repeating phenomenon consisting of the daily formation of an extremely elongated cloud extending as far as 1,800 km westward from Arsia Mons. It takes place in the solar longitude (Ls) range of ∼220°-320°, around the Southern solstice. We study this Arsia Mons Elongated Cloud (AMEC) using images from diffe…
The Dayside Ionopause of Mars: Solar Wind Interaction, Pressure Balance, and Comparisons With Venus
Gurnett, D. A.; Kopf, A. J.; Halekas, J. +5 more
Due to the lower ionospheric thermal pressure and existence of the crustal magnetism at Mars, the Martian ionopause is expected to behave differently from the ionopause at Venus. We study the solar wind interaction and pressure balance at the ionopause of Mars using both in situ and remote sounding measurements from the Mars Advanced Radar for Sub…
Depositional Controls of the Layered Deposits of Arabia Terra, Mars: Hints From Basin Geometries and Stratigraphic Trends
Rossi, A. P.; Pondrelli, M.; Le Deit, L. +4 more
An extensive distribution of water-altered equatorial layered deposits (ELDs) characterizes the densely cratered terrain of Arabia Terra (AT), Mars. The majority of these deposits reside within craters and are easily identified by laterally continuous layering. The processes that led to their formation have been widely investigated, but remain unr…
Geologic and Thermal Characterization of Oxia Planum Using Mars Odyssey THEMIS Data
Rogers, A. D.; Gary-Bicas, C. E.
Oxia Planum will be the landing site for the European Space Agency ExoMars 2022 "Rosalind Franklin" mission to conduct astrobiological and geological experiments investigating the region's past. Previous orbital short wave infrared (SWIR, 1.0-2.6 µm) spectroscopic studies reported widespread phyllosilicate detections in the region suggesting…
Tectonic Deformation and Volatile Loss in the Formation of Noctis Labyrinthus, Mars
Kling, Corbin L.; Byrne, Paul K.; Wegmann, Karl W. +1 more
Noctis Labyrinthus is a little-studied and structurally complex area situated between the Tharsis Rise and Valles Marineris on Mars. Noctis Labyrinthus is dissected by normal faults that form horst and graben, pit craters situated inside the graben, and large troughs that cross-cut both graben and pit craters. Mass wasting, periglacial, and some e…
Seasonal and Spatial Variability of Carbon Monoxide (CO) in the Martian Atmosphere From PFS/MEX Observations
Vandaele, Ann Carine; Daerden, Frank; Neary, Lori +7 more
A subset of more than 100,000 nadir measurements covering more than 7 Martian years (MY 26-MY 33) recorded in the thermal part of the Short Wavelength Channel (SWC) from the Planetary Fourier Spectrometer (PFS) on board Mars Express is exploited to investigate the global distribution and the seasonal cycle of carbon monoxide (CO) on Mars. The retr…
Vertical Distribution of Aerosols and Hazes Over Jupiter's Great Red Spot and Its Surroundings in 2016 From HST/WFC3 Imaging
Irwin, Patrick G. J.; Sánchez-Lavega, Agustín.; Anguiano-Arteaga, Asier +2 more
In this work, we have analyzed images provided by the Hubble Space Telescope's Wide Field Camera 3 (HST/WFC3) in December 2016, with a spectral coverage from the ultraviolet to the near infrared. We have obtained the spectral reflectivity of the GRS and its surroundings, with particular emphasis on selected, dynamically interesting regions. A spec…
Gravity Wave Packets in the Venusian Atmosphere Observed by Radio Occultation Experiments: Comparison With Saturation Theory
Tellmann, Silvia; Pätzold, Martin; Mori, Ryota +3 more
The characteristics of gravity wave packets in the Venusian atmosphere were studied using high-vertical-resolution temperature profiles obtained by ESA's Venus Express and JAXA's Akatsuki radio occultation experiments with radio holographic methods. Localized disturbances were detected by applying a wavelet transform to the temperature profiles. T…
Constraints on Emission Source Locations of Methane Detected by Mars Science Laboratory
Newman, C. E.; Richardson, M. I.; Viúdez-Moreiras, D.
The Sample Analysis at Mars (SAM) instrument on the Mars Science Laboratory (MSL) Curiosity rover has detected both methane spikes and variable background methane abundance in recent years in Gale Crater, Mars. While methane spikes have been attributed to a hypothetical local or regional source emission, the background measurements acquired during…
Modeling the Hydrodynamics, Sediment Transport, and Valley Incision of Outlet-Forming Floods From Martian Crater Lakes
Goudge, Timothy A.; Fassett, Caleb I.
Open-basin lakes that have outlets, formed where the stored water breached the basin-confining topography (e.g., crater rims), have been recognized on Mars for decades. However, the mechanics involved in formation of these outlets has not been studied in detail. Here, we study this outlet formation process through a series of numerical experiments…