Results 311 to 320 of about 111,299 (362)
Detection of Methane in the Atmosphere of Mars [PDF]
Science, 2004 We report a detection of methane in the martian atmosphere by the Planetary Fourier Spectrometer onboard the Mars Express spacecraft. The global average methane mixing ratio is found to be 10 ± 5 parts per billion by volume (ppbv). However, the mixing ratio varies between 0 and 30 ppbv over the planet.
Thérèse Encrenaz +5 more
openaire +4 more sources
Some of the next articles are maybe not open access.
Related searches:
Related searches:
Science, 1966
The thermal structure of the upper atmosphere of Mars has been theoretically investigated. The exospheric temperature, for a pure CO 2 model atmosphere, lies between 400° and 700°K. The origin of the Martian atmosphere is discussed in the light of these results.
S. H. Gross +2 more
openaire +3 more sources
The thermal structure of the upper atmosphere of Mars has been theoretically investigated. The exospheric temperature, for a pure CO 2 model atmosphere, lies between 400° and 700°K. The origin of the Martian atmosphere is discussed in the light of these results.
S. H. Gross +2 more
openaire +3 more sources
Heterogeneous chemistry in the atmosphere of Mars
Nature, 2008Hydrogen radicals are produced in the martian atmosphere by the photolysis of water vapour and subsequently initiate catalytic cycles that recycle carbon dioxide from its photolysis product carbon monoxide. These processes provide a qualitative explanation for the stability of the atmosphere of Mars, which contains 95 per cent carbon dioxide. Balancing
Lefèvre, Franck +8 more
openaire +5 more sources
Science, 1965
The Martian ionospheric observations made by Mariner IV are interpreted in terms of an atmospheric model. The ion peak is identified as an F2 peak, that is, as a maximum whose profile is controlled by ambipolar diffusion. The principal features of the resulting atmospheric model are that the atmosphere consists mainly of carbon dioxide ...
openaire +2 more sources
The Martian ionospheric observations made by Mariner IV are interpreted in terms of an atmospheric model. The ion peak is identified as an F2 peak, that is, as a maximum whose profile is controlled by ambipolar diffusion. The principal features of the resulting atmospheric model are that the atmosphere consists mainly of carbon dioxide ...
openaire +2 more sources
Annual Review of Earth and Planetary Sciences, 1974
The atmosphere of Mars is essentially a pure carbon dioxide atmosphere that contains a small and seasonably varying amount of water vapor. A number of minor constituents which arise from the interactions of solar radiation with water vapor and carbon dioxide include carbon monoxide, atomic oxygen, molecular oxygen, ozone, and atomic hydrogen.
openaire +2 more sources
The atmosphere of Mars is essentially a pure carbon dioxide atmosphere that contains a small and seasonably varying amount of water vapor. A number of minor constituents which arise from the interactions of solar radiation with water vapor and carbon dioxide include carbon monoxide, atomic oxygen, molecular oxygen, ozone, and atomic hydrogen.
openaire +2 more sources
Science, 1972
Photochemical reactions in the martian exosphere produce fast atoms of oxygen, carbon, and nitrogen and provide large escape fluxes of these elements. They appear to play a crucial role in the evolution of the martian atmosphere. The relative outgassing rates of H 2 O and CO 2 on Mars are ...
openaire +3 more sources
Photochemical reactions in the martian exosphere produce fast atoms of oxygen, carbon, and nitrogen and provide large escape fluxes of these elements. They appear to play a crucial role in the evolution of the martian atmosphere. The relative outgassing rates of H 2 O and CO 2 on Mars are ...
openaire +3 more sources
Atmospheric oscillations on Mars [PDF]
Nature, 1988 Les donnees barometriques recueillies par la sonde Viking lors de son atterrissage sur Mars revelent des oscillations quotidiennes liees a des variations saisonnieres deja ...
openaire +1 more source
2019
It is believed that Mars underwent drastic climate change, changing its environment from warm and wet to cold and dry. This gives rise to the idea that Mars may have hosted life in the past and, indeed, may do so even today. Atmospheric evolution is thus an important key to understanding the history of Martian habitability.
openaire +2 more sources
It is believed that Mars underwent drastic climate change, changing its environment from warm and wet to cold and dry. This gives rise to the idea that Mars may have hosted life in the past and, indeed, may do so even today. Atmospheric evolution is thus an important key to understanding the history of Martian habitability.
openaire +2 more sources
Measurements in the Atmosphere of Mars
Applied Optics, 1969The detailed definition of the key features of Mars' atmosphere from one or a few entries and landings is a challenging task involving a variety of measurements, taken during entry and after landing, and correlated with observations to be taken from orbiters and flyby missions.
openaire +3 more sources
The atmospheres of mars and venus
Die Naturwissenschaften, 1970[1] Kundt, W.: Z. Physik 163, 77 (I961).---Robinson, I., Trautman, A.: Proc. Roy. Soc. A z6s, 463 (1962). Kundt, W., Trtimper, M. : Akad. Wiss. Mainz, Abh. math.-nat. K1. Nr. 12, 980 (1962).-Pirani, F. A. E., in : Trautman, A., Pirani, F. A. E., Boudi, H. : Brandeis Summer Inst. inTheor. Phys. 1964. Vol. 1. New Jersey: prentice Hall I965. [2] Kundt, W.,
openaire +2 more sources