Results 201 to 210 of about 25,918 (240)

Photochemistry of the Martian atmosphere

Icarus, 1977
A critical analysis is carried out for models which may be fine tuned to give agreement with observational constraints for O2, CO, and O3 in the Martian lower atmosphere and which are in accord also with upper atmospheric data for O and CO. The models have a number of features in common: dynamic mixing must be exceedingly rapid at heights above 90 km ...
T.Y. Kong, M.B. McElroy
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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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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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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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On the abundance of NO2 in the Martian atmosphere

Icarus, 1975
Abstract Spectrophotometric scans of Mars and the Moon in the region 4000–5000 A were obtained and ratioed. No evidence of any absorption greater than 3% is visible in the Martian spectrum. Using our own laboratory spectra of NO 2 as well as the published work of Hall and Blacet (1952) we confirm Marshall's (1964) upper limit of 8 μm atmospheres
Tobias Owen, Thomas Scattergood, Jerry H. Woodman   +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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Physical parameters of the martian atmosphere

Earth, Moon, and Planets, 1989
The following physical parameters have been computed from 0 to 200 km altitude; (1) pressure, (2) density (3), speed of sound, (4) density, (5) number density, (6) mean free path, (7) viscosity, (8) pressure scale, (9) mean particle velocity, (10) collisional frequency and (11) columnar mass.
Basil Petropoulos, Constantin Macris
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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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Is there a Martian atmospheric electric circuit?

Journal of Geophysical Research: Planets, 2001
Laboratory, analytical, and simulation studies suggest that Martian dust clouds can become significantly charged via dust/dust contact electrification. If moderate‐size dust clouds on Mars are like their terrestrial counterparts, they are expected to have the capacity to create electric fields in excess of 1 kV/m.
W. M. Farrell, M. D. Desch
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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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