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Photochemistry of HCl in the martian atmosphere
Icarus, 2022The recent discovery of HCl on Mars (Korablev et al. 2021, Olsen et al. 2021) indicates its strong seasonal variations and correlation with dust. To study this idea, we develop photochemical models for summer midlatitudes at aphelion and perihelion. We assume that HCl is formed in heterogeneous reactions of FeCl3 and/or NaCl in the dust with H, and the
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A Photochemical Model of the Martian Atmosphere
Icarus, 1994The factors governing the amounts of CO, O2, and O3 in the martian atmosphere are investigated using a minimally constrained, one-dimensional photochemical model. We find that the incorporation of temperature-dependent CO2 absorption cross sections leads to an enhancement in the water photolysis rate, increasing the abundance of OH radicals to the ...
Nair, Hari +4 more
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Meteoric ion layers in the Martian atmosphere
Faraday Discussions, 2010Low-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, 1991Data 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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Atmospheric effects on Martian aerocapture
17th Atmospheric Flight Mechanics Conference, 1990A preliminary study of the effects of the atmosphere on Martian aerocapture has been completed at NASA-Johnson. Nominal cases were defined and several types of density dispersions utilized to show the effect of L/D ratio on aerocapture performance. Both open and closed loop three-degree-of-freedom simulations were developed.
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Experimental and numerical investigation on Martian atmosphere entry
39th Aerospace Sciences Meeting and Exhibit, 2001A numerical and experimental investigation was performed to study the aerothermodynamic problems of entry into the Martian atmosphere. The mathematical and physical model used to study the flowfield around a capsule entering a CO 2 environment is described. Computational fluid dynamics tools have been applied to solve the system of governing equations.
PATERNA D. +3 more
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Sun Imaging though the Martian Atmosphere
2008 IEEE Aerospace Conference, 2008This paper discusses the sun images acquired with the panoramic cameras (pancam) on the Mars exploration rovers. The mission goals, the camera design, the data processing and the results are discussed. Each of the two rovers has two cameras, one with a bandpass filter centered at 880 nm and one centered at 440 nm.
Carl Christian Liebe +2 more
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Clues to the Martian Atmosphere
Science, 2001Some 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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Atmospheric effects on Martian Ejecta Emplacement
Journal of Geophysical Research: Solid Earth, 1979Analytical descriptions of crater growth and numerical calculations of aerodynamic drag have been combined to evaluate the possible effects of drag on impact crater ejecta emplacement on Mars. Below a critical particle size, ejecta deposition is severely restricted in range.
Peter H. Schultz, Donald E. Gault
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Photochemistry of the Martian Atmosphere
1986A 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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