Results 241 to 250 of about 26,803 (256)

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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Electron reflectometry in the martian atmosphere [PDF]

Icarus, 2008
The technique of electron reflectometry, a method for remote estimation of planetary magnetic fields, is expanded from its original use of mapping crustal magnetic fields at the Moon to achieving the same purpose at Mars, where the presence of a substantial atmosphere complicates matters considerably. The motion of solar wind electrons, incident on the
Mario H. Acuña, Robert P. Lin, David L. Mitchell, Robert Lillis   +3 more
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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.
Constantin Macris, B. Petropoulos
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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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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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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
T. W. Scattergood, Tobias Owen, Jerry H. Woodman   +2 more
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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 ...
Carl D. Murray, Lars G. Adolfsson, Bo Å. S. Gustafson   +2 more
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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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Dust injection into the Martian atmosphere

Icarus, 1975
The sequence of events culminating in a global Martian dust storm is reviewed in the light of current theories on dust storm generation. Based upon experimental results, a mechanism for the initiation of global dust storms on Mars is proposed. According to this mechanism, the diurnal variation of surface temperature results in desorption of adsorbed ...
Robert R. Reeves, Douglas W. Johnson, Paul Harteck   +2 more
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