Results 251 to 260 of about 736,131 (304)

Positioning, navigation, and timing on the Moon and Mars with galactic cosmic rays. [PDF]

iScience
Leone G, Tanaka HKM, Holma M, Krishnan S, Duffy AR, Enqvist T, Kuusiniemi P, Joutsenvaara J, Cerretto G, Cantoni E, Sellone M, Marteau J, Lo Presti D, Szűcs JG, Varga D.   +14 more
europepmc   +1 more source

Detection of ferrihydrite in Martian red dust records ancient cold and wet conditions on Mars. [PDF]

Nat Commun
Valantinas A, Mustard JF, Chevrier V, Mangold N, Bishop JL, Pommerol A, Beck P, Poch O, Applin DM, Cloutis EA, Hiroi T, Robertson K, Pérez-López S, Ottersberg R, Villanueva GL, Stcherbinine A, Patel MR, Thomas N.   +17 more
europepmc   +1 more source

Evolution of a Martian CO₂ atmosphere

, 2019
openaire   +2 more sources

Survival of Filamentous Cyanobacteria Through Martian ISRU: Combined Effects of Desiccation and UV-B Radiation. [PDF]

Microorganisms
Arribas Tiemblo M, Macário IPE, Tornero A, Yáñez A, Andrejkovičová S, Gómez F.   +5 more
europepmc   +1 more source

Energy balance and heating mechanisms of the Martian Upper atmosphere with the NASA Ames MGCM.

Leonardos Gkouvelis
openalex   +2 more sources

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Photochemistry of HCl in the martian atmosphere

Icarus, 2022
The recent discovery of HCl on Mars (Korablev et al. 2021, Olsen et al. 2021) indicates its strong seasonal variations and correlation with dust. To study this idea, we develop photochemical models for summer midlatitudes at aphelion and perihelion. We assume that HCl is formed in heterogeneous reactions of FeCl3 and/or NaCl in the dust with H, and the
V. Krasnopolsky
openaire   +2 more sources

A Photochemical Model of the Martian Atmosphere

Icarus, 1994
The factors governing the amounts of CO, O2, and O3 in the martian atmosphere are investigated using a minimally constrained, one-dimensional photochemical model. We find that the incorporation of temperature-dependent CO2 absorption cross sections leads to an enhancement in the water photolysis rate, increasing the abundance of OH radicals to the ...
Nair, Hari, Allen, Mark, Anbar, Ariel D., Yung, Yuk L., Clancy, R. Todd   +4 more
openaire   +3 more sources

Isotopic Composition of the Martian Atmosphere

Science, 1976
Results from the neutral mass spectrometer carried on the aeroshell of Viking 1 show evidence for NO in the upper atmosphere of Mars and indicate that the isotopic composition of carbon and oxygen is similar to that of Earth. Mars is enriched in 15 N relative to Earth by about 75 percent, a consequence of escape ...
Nier, Alfred O., McElroy, Michael B., Yung, Yuk Ling   +2 more
openaire   +3 more sources

Martian Atmospheric Erosion Rates

Science, 2007
Mars was once wet but is now dry, and the fate of its ancient carbon dioxide atmosphere is one of the biggest puzzles in martian planetology. We have measured the current loss rate due to the solar wind interaction for different species: Q(O + ) = 1.6·10 23 per second = 4 grams per second (g ...
Stas, Barabash, Andrei, Fedorov, Rickard, Lundin, Jean-Andre, Sauvaud   +3 more
openaire   +2 more sources