Results 11 to 20 of about 2,029 (193)

Meteoric Metal Chemistry in the Martian Atmosphere. [PDF]

J Geophys Res Planets, 2018
AbstractRecent measurements by the Imaging Ultraviolet Spectrograph (IUVS) instrument on NASA's Mars Atmosphere and Volatile EvolutioN mission show that a persistent layer of Mg+ ions occurs around 90 km in the Martian atmosphere but that neutral Mg atoms are not detectable.
Plane JMC, Carrillo-Sanchez JD, Mangan TP, Crismani MMJ, Schneider NM, Määttänen A.   +5 more
europepmc   +7 more sources

The value of returning a sample of the Martian atmosphere. [PDF]

Proc Natl Acad Sci U S A
The elemental and isotopic abundances of major species in the Martian atmosphere have been determined, but analyses often lack sufficient precision, and those of minor and trace species are frequently not well known. Many important questions about the evolution and current state of Mars require the kind of knowledge that can be gained from analysis of ...
Swindle TD, Pack A, Schwenzer SP, Young ED.   +3 more
europepmc   +4 more sources

Impact sculpting of the early martian atmosphere. [PDF]

Sci Adv
Intense bombardment of solar system planets in the immediate aftermath of protoplanetary disk dissipation has played a key role in their atmospheric evolution. During this epoch, energetic collisions will have removed substantial masses of gas from rocky planet atmospheres.
Shorttle O, Saeidfirozeh H, Rimmer PB, Laitl V, Kubelík P, Petera L, Ferus M.   +6 more
europepmc   +7 more sources

Stability of the Martian Atmosphere [PDF]

Science, 1972
A detailed chemical dynamic model is presented for a moist martian atmosphere. Recombination of carbon dioxide is catalyzed by trace amounts of water. The abundances of carbon monoxide and molecular oxygen should vary in response to changes in atmospheric water and atmospheric mixing.
M B, McElroy, T M, Donahue
openaire   +2 more sources

Clouds in the Martian Atmosphere [PDF]

, 2021
Abstract Although resembling an extremely dry desert, planet Mars hosts clouds in its atmosphere. Every day somewhere on the planet a part of the tiny amount of water vapor held by the atmosphere can condense as ice crystals to form mainly cirrus-type clouds.
Määttänen, Anni, Montmessin, Franck
openaire   +3 more sources

Mie scattering and the Martian atmosphere [PDF]

Symposium - International Astronomical Union, 1971
It has been suggested that the discrepancy between radio occultation determinations of the Martian atmospheric surface pressure (3.8 to 7 mb) and those deduced from optical polarization measurements and a simple Rayleigh atmosphere model (about 10 mb) are the results of sub-micron sized aerosols in the Martian atmosphere.
Walter G. Egan, Kenneth M. Foreman
openaire   +1 more source

THE MARTIAN ATMOSPHERIC BOUNDARY LAYER [PDF]

Reviews of Geophysics, 2011
The planetary boundary layer (PBL) represents the part of the atmosphere that is strongly influenced by the presence of the underlying surface and mediates the key interactions between the atmosphere and the surface. On Mars, this represents the lowest 10 km of the atmosphere during the daytime.
Petrosyan, A., Galperin, B., Larsen, S. E., Lewis, S., Määttänen, Anni, Read, P. L., Rennó, N., Rogberg, L. P. H. T., Savijärvi, H., Siili, T., Spiga, A., Toigo, A., Vazquez, L.   +12 more
openaire   +3 more sources

Optimal Technology Allocation of in the Life Support Subsystem with Maximum Reliability [PDF]

فناوری در مهندسی هوافضا, 2023
The atmosphere of the Red Planet or Mars contains 95% of carbon dioxide, 3% of nitrogen, 1.6% of argon and only a small amount of oxygen, and in terms of concentration is about one percent of the planet's atmosphere, which makes it virtually impossible ...
Milad Mahmoudi, A. B. Basohbate Novinzadeh, Farshad Pazooki   +2 more
doaj   +1 more source

Quantification of Carbonates, Oxychlorines, and Chlorine Generated by Heterogeneous Electrochemistry Induced by Martian Dust Activity

Geophysical Research Letters, 2023
Heterogeneous electrochemistry induced by Martian dust activity is an important type of atmosphere‐surface interaction that affects geochemical processes at the Martian surface and in the Martian atmosphere.
Alian Wang, Andrew W. Jackson, Neil C. Sturchio, Jen Houghton, Chuck Y. C. Yan, Kevin S. Olsen, Quincy H. K. Qu   +6 more
doaj   +1 more source

A distinct ripple-formation regime on Mars revealed by the morphometrics of barchan dunes

Nature Communications, 2022
Dust storms on Mars drive water escape to space. Here, the authors show the impact Martian dust storms have on the abundance of atmospheric hydrogen and oxygen, and how this helps to overall oxidize the Martian atmosphere.
Lior Rubanenko, Mathieu G. A. Lapôtre, Ryan C. Ewing, Lori K. Fenton, Andrew Gunn   +4 more
doaj   +1 more source