Results 321 to 330 of about 109,426 (361)

On the atmosphere of Mars

Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London
The author refers the origin of the hypothesis of the “Extensive Atmosphere of Mars” to the observations of Cassini and Rœner, made at Briare and Paris in the year 1672. By the former it would seem that a star of the fifth magnitude became invisible with a three-feet telescope when at a distance of six minutes from the planet whilst by the latter the ...
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Nightglow in the Upper Atmosphere of Mars and Implications for Atmospheric Transport

Science, 2005
We detected light emissions in the nightside martian atmosphere with the SPICAM (spectroscopy for the investigation of the characteristics of the atmosphere of Mars) ultraviolet (UV) spectrometer on board the Mars Express. The UV spectrum of this nightglow is composed of hydrogen Lyman α emission (121.6 nanometers) and the γ and δ bands of
Bertaux, Jean-Loup, Leblanc, François, Perrier, Séverine, Quémerais, Eric, Korablev, Oleg, Dimarellis, Emmanuel, Reberac, Aurélie, Forget, François, C. Simon, P., Stern, S.A., Sandel, Bill R.   +10 more
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The Atmosphere and Climate of Mars

2017
Humanity has long been fascinated by the planet Mars. Was its climate ever conducive to life? What is the atmosphere like today and why did it change so dramatically over time? Eleven spacecraft have successfully flown to Mars since the Viking mission of the 1970s and early 1980s.
François Forget, Robert M. Haberle, M. D. Smith, Richard W. Zurek, R. Todd Clancy   +4 more
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The atmosphere and haze of Mars

Journal of Geophysical Research, 1960
The 'blue haze' is an absorbing smoke, dark as soot in reflection, red in transmission. Its currently accepted explanation by pure scattering (omnidirectional or forward) is untenable, as it would either increase the surface brightness of fall to obscure the surface details.
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The Atmosphere of Mars: Detection of Krypton and Xenon

Science, 1976
Krypton and xenon have been discovered in the martian atmosphere with the mass spectrometer on the second Viking lander. Krypton is more abundant than xenon. The relative abundances of the krypton isotopes appear normal, but the ratio of xenon-129 to xenon-132 is enhanced on Mars relative to the terrestrial value for this ratio.
D. W. Howarth, Klaus Biemann, J. E. Biller, Tobias Owen, A. L. Lafleur, D. R. Rushneck   +5 more
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Oblateness of the atmosphere of Mars

Nature, 1976
ON April 8, 1976 Mars occulted the bright star ɛ Geminorum (magnitude 3.2). Predictions1 were issued well in advance since such occurrences are very rare: indeed, it is estimated that Mars occults a star as bright as this about once in 500 yr. Accurate observations of the duration of the occultation were made from four sites on the Earth and these are ...
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Ionization in the Atmosphere of Mars

Proceedings of the IRE, 1929
Assuming that the atmosphere at the surface of Mars consists of ⅕ oxygen and ⅘ other gases, as nitrogen, etc., the composition of the atmosphere to great heights is calculated, just as was done for the earth, from the actions of gas diffusion and gravity. The electron density in the atmosphere of Mars due to the ultraviolet light of the sun is found to
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Upper Atmosphere and Ionosphere of Mars

Science, 1966
It is argued that the single-layer ionosphere at 125 kilometers discovered in the Mariner IV occultation experiment is an F1 region coinciding with the ultraviolet photoionization peak. The CO 2 density there must be of the order of 10 11 molecules per cubic centimeter.
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The Atmospheres of Mars and Venus

1965
The nine planets of our solar system can be grouped into two distinct classes: (1) the terrestrial planets, which include Mercury, Venus, Earth and Mars; and (2) the major planets — Jupiter, Saturn, Uranus, Neptune and Pluto.
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The Atmosphere of Mars

Scientific American, 1977
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