Results 171 to 180 of about 604,790 (209)

Martian atmosphere and crust

Icarus, 1966
Abstract The Martian atmosphere in its average condition is inactive and transparent to long-wave radiation. It is activated when moisture is supplied by the evaporation of the polar cap in spring time. As typical examples, the great yellow cloud in 1956, the Neith-Casius cloud, and the Propontis cloud are described.
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Meteoric ion layers in the Martian atmosphere

Faraday Discussions, 2010
Low-lying plasma layers have been observed sporadically in the Martian atmosphere by radio occultation measurements from spacecraft such as the Mars Express Orbiter and the Mars Global Surveyor. These layers are just a few km wide, and tend to occur around 90 km. It has been proposed that the layers consist of metallic ions, for two reasons: they occur
Charlotte L, Whalley, John M C, Plane
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Composition of the Martian atmosphere

Space Science Reviews, 1991
Data on the composition of the Martian atmosphere obtained by instruments aboard the Viking spacecraft are not of sufficient accuracy to address important questions regarding the composition and history of Mars. Laboratory analyses of gases trapped in glassy phases of shergottite meteorite EETA 79001 yield precise data, but it remains to be ascertained
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Buildup with Bremsstrahlung in the Martian Atmosphere

Nuclear Science and Engineering, 2020
Photon buildup is a function of energy, medium, and geometry and therefore must be specifically calculated for the case of interest.
Praneel P. Gulabrao, Kevin T. Clarno
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CO2 solubility in Martian basalts and Martian atmospheric evolution

Geochimica et Cosmochimica Acta, 2011
Abstract To understand possible volcanogenic fluxes of CO 2 to the Martian atmosphere, we investigated experimentally carbonate solubility in a synthetic melt based on the Adirondack-class Humphrey basalt at 1–2.5 GPa and 1400–1625 °C. Starting materials included both oxidized and reduced compositions, allowing a test of the effect of iron oxidation
Ben D. Stanley, Marc M. Hirschmann, Anthony C. Withers   +2 more
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Clues to the Martian Atmosphere

Science, 2001
Some 30 years ago, it was discovered that the main constituent of the thin martian atmosphere is carbon dioxide (CO) but that it only contained trace amounts of carbon monoxide and molecular oxygen, the photodissociation products of CO. Chemical reaction cycles involving water and hydrogen species have been developed to explain these observations, but ...
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Fractionated martian atmosphere in the nakhlites?

Meteoritics, 1994
Abstract— Considerable evidence points to a martian origin of the SNC meteorites. Noble gas isotopic compositions have been measured in most SNC meteorites. The 129Xe/132Xe vs. 84Kr/132Xe ratios in Chassigny, most shergottites, and lithology C of EETA 79001 define a linear array.
M J, Drake, T D, Swindle, T, Owen, D S, Musselwhite   +3 more
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Photochemistry of the Martian Atmosphere

1986
A problem and ways to solve it. Consider a problem of the calculation of ionospheric composition with the neutral upper atmospheric composition being known.
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A discussion of Martian atmospheric dynamics

Planetary and Space Science, 1967
Abstract We have computed radiative relaxation times for temperature perturbations in CO 2 with small admixtures of water vapor under conditions which are similar to those occurring in the martian atmosphere. Certain aspects of the influence of radiative transfer on dynamical phenomena in the martian atmosphere are discussed in terms of these ...
Richard Goody, Michael J.S. Belton
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The Martian Atmosphere as a Meteoroid Detector

Icarus, 1996
Abstract We investigate the plausibility of detecting meteors from the surface of Mars. We estimate the flux of high-speed photographic meteoroids at the orbit of Mars to be ∼50% that at Earth. Because the atmospheric densities of the Earth and Mars are comparable at a height of 120 km, close to where meteor ablation occurs on Earth, we also expect ...
Lars G. Adolfsson, Bo Å.S. Gustafson, Carl D. Murray   +2 more
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