Results 171 to 180 of about 6,471 (197)

A model of rotating exospheres

Journal of Geophysical Research: Space Physics, 1993
Using a truncated Boltzmann distribution, we analyze the neutral density profile of an isothermal planetary exosphere. In the absence of rotation, the classical result obtained by Chamberlain is recovered. When rotation exists, a latitude‐dependent limit appears and the total bound mass presents a logarithmic divergence.
M. Membrado, A. F. Pacheco, J. Sañudo
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The Lunar Argon Exosphere

2020
In this chapter, we turn away from giant impacts themselves to study a particular feature hosted by the most famous outcome of a giant impact, the Moon; specifically the lunar argon exosphere with its links to the Moon’s interior. This is just one example of a connection between the consequences of giant impacts and their role in planet formation to ...
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Exospheric escape: A parametrical study

Advances in Space Research, 2018
Abstract The study of exospheres can help us understand the long-term loss of volatiles from planetary bodies due to interactions of planets, satellites, and small bodies with the interplanetary medium, solar radiation, and internal forces including diffusion and outgassing.
Rosemary M. Killen, Matthew H. Burger, William M. Farrell   +2 more
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Exosphere of the Moon

1966
The relative smallness of the mass of the Moon and the low velocity of escape from its gravitational field, together with the probable chemical composition of its globe as discussed in the preceding chapter, entail several further important consequences; and perhaps the most important one for an understanding of lunar surface features is the well-nigh ...
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The calcium exosphere of Mercury

Icarus, 2005
Abstract A tenuous calcium atmosphere at Mercury, principally seen in the polar regions, was first observed in July, 1998, using the High Resolution Echelle Spectrograph (HIRES) at the W.M. Keck I telescope (Bida et al., Nature 404, 159, 2000). We report four years of observations of the calcium exosphere of Mercury, confirming the initial findings ...
R KILLEN, T BIDA, T MORGAN
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The Exosphere and Geocorona

1972
This paper reviews the observational evidence on the hydrogen geocorona including its density, vertical structure, and the nature of its diurnal and other solar-related variability. The relationship of observationally-derived models of the exosphere and geocorona to the thermosphere is indicated.
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Exospheres and planetary escape

2002
A summary is given of the theory of an exosphere, the outermost region of an atmosphere where collisions can usually be neglected, and of escape of its lighter constituents. Special cases, such as energy-limited hydrodynamic loss, are briefly discussed. Surface-bounded exospheres are treated in Chapter III.3.
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Exospheric model of the plasmasphere

Journal of Atmospheric and Solar-Terrestrial Physics, 2001
Abstract ISEE observations indicate that after prolonged quiet periods, the saturated equatorial density decreases exponentially with the radial distance in the plasmasphere. No hydrostatic barometric models fit the saturated equatorial density profiles, since those obtained with barometric maxwellian or lorentzian kinetic models decrease more slowly
V. Pierrard, J. Lemaire
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Atmosphere and Lowermost Exosphere

2017
The anthropogenic modifications of the atmosphere's trace gases and their heat content occurred because of world population growth, agriculture, industrial economy, deforestation, land use change, mobility, and urbanisation. CO2 concentration increased from ca.
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Lateral flow in the exosphere

Planetary and Space Science, 1967
Hydrogen and helium lateral flow in collisionless exosphere calculated on model for various sinusoidal temperature and concentration variations over exobase ...
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