Results 31 to 40 of about 61,565 (266)
Distribution of Dune Landform on Mars
Frontiers in Astronomy and Space Sciences, 2022 Dune landforms are widely distributed on Mars and contain abundant information about the Martian atmosphere and sedimentary environment. At present, the understanding of Martian dunes and their environmental significance still needs to be further ...
Li Chao, Dong Zhibao
doaj +1 more source
Did high-energy astrophysical sources contribute to Martian atmospheric loss? [PDF]
MNRAS (November 21, 2016) Vol. 463 L64-L68, 2016 Mars is believed to have had a substantial atmosphere in the past. Atmospheric loss led to depressurization and cooling, and is thought to be the primary driving force responsible for the loss of liquid water from its surface. Recently, MAVEN observations have provided new insight into the physics of atmospheric loss induced by ICMEs and solar wind ...
arxiv +1 more source
Martian Dust Storms and Gravity Waves: Disentangling Water Transport to the Upper Atmosphere [PDF]
, 2022 Simulations with the Max Planck Institute Martian general circulation model for Martian years 28 and 34 reveal details of the water "pump" mechanism and the role of gravity wave (GW) forcing. Water is advected to the upper atmosphere mainly by upward branches of the meridional circulation: in low latitudes during equinoxes and over the south pole ...
arxiv +1 more source
Cloud trains associated with Martian Mountain Lee Waves on the eastern side of the Phlegra Montes
Earth, Planets and Space, 2023 Mountain lee waves have often been observed on the eastern side of the Phlegra Montes as wave trains visualized by water ice clouds in the Martian atmosphere. The seasonality and formation condition of these lee waves and associated cloud trains have not
Kazunori Ogohara, Maaya Ro
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Dust storm-enhanced gravity wave activity in the Martian thermosphere observed by MAVEN and implication for atmospheric escape [PDF]
, 2021 Lower atmospheric global dust storms affect the small- and large-scale weather and variability of the whole Martian atmosphere. Analysis of the CO$_2$ density data from the Neutral Gas and Ion Mass Spectrometer instrument (NGIMS) on board NASA's Mars Atmosphere Volatile EvolutioN (MAVEN) spacecraft show a remarkable increase of GW-induced density ...
arxiv +1 more source
Earth, Planets and Space, 2021 The mass spectrum analyzer (MSA) will perform in situ observations of ions and magnetic fields around Phobos as part of the Martian Moons eXploration (MMX) mission to investigate the origin of the Martian moons and physical processes in the Martian ...
Shoichiro Yokota +16 more
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Evolution of Water Reservoirs on Mars: Constraints from Hydrogen Isotopes in Martian Meteorites [PDF]
, 2014 Martian surface morphology implies that Mars was once warm enough to maintain persistent liquid water on its surface. While the high D/H ratios (~6 times the Earth's ocean water) of the current martian atmosphere suggest that significant water has been lost from the surface during martian history, the timing, processes, and the amount of the water loss
arxiv +1 more source
Strong depletion of $^{13}$C in CO induced by photolysis of CO$_{2}$ in the Martian atmosphere calculated by a photochemical model [PDF]
arXiv, 2023 The isotopic signature of atmospheric carbon offers a unique tracer for the history of the Martian atmosphere and the origin of organic matter on Mars. Photolysis of CO$_{2}$ is known to induce strong isotopic fractionation of carbon between CO$_{2}$ and CO.
arxiv
CO+ first-negative band emission: A tracer for CO in the Martian upper atmosphere [PDF]
A&A 639, A60 (2020), 2020 Recently, Imaging Ultraviolet Spectrograph (IUVS) on-board Mars Atmosphere and Volatile EvolutioN (MAVEN) satellite observed CO$^+$ first-negative band limb emission in the Martian upper atmosphere. We aim to explore the photochemical processes in the Martian upper atmosphere, which drives this band emission. A photochemical model is developed to study
arxiv +1 more source
A Lower Limit of Atmospheric Pressure on Early Mars Inferred from Nitrogen and Argon Isotopic Compositions [PDF]
, 2017 We examine the history of the loss and replenishment of the Martian atmosphere using elemental and isotopic compositions of nitrogen and noble gases. The evolution of the atmosphere is calculated by taking into consideration various processes: impact erosion and replenishment by asteroids and comets, atmospheric escape induced by solar radiation and ...
arxiv +1 more source