Results 241 to 250 of about 141,901 (265)

Exospheres and Atmospheric Escape

Space Science Reviews, 2008
Aeronomy is a description of the physics and chemistry of the upper atmospheres and ionospheres of planetary bodies. In this chapter we consider those processes occurring in the upper atmosphere that determine the structure of the corona and lead to molecular escape.
Johnson, R. E., Combi, M. R., Fox, J. L., Ip, W.-H., Leblanc, François, Mcgrath, M. A., Shematovich, V. I., Strobel, D. F., Waite Jr., J. H.   +8 more
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Escaping atmospheres of extrasolar planets

Science, 2018
The study of helium absorption opens a new window on escaping exo ...
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Escape of Planetary Atmospheres. I. Escape Layer

The Physics of Fluids, 1961
The critical layer for thermal escape of a planetary atmosphere is treated on a model in which an isothermal exosphere at high temperature merges within a narrow zone (the endopause) of varying temperature into the remainder (the endosphere) of the atmosphere, isothermal above the level at which mixing stops.
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Titan's hydrodynamically escaping atmosphere

Icarus, 2008
Abstract The upper atmosphere of Titan is currently losing mass at a rate ∼ ( 4 – 5 ) × 10 28 amu s −1 , by hydrodynamic escape as a high density, slow outward expansion driven principally by solar UV heating by CH4 absorption. The hydrodynamic mass loss is essentially CH4 and H2 escape.
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Solar Wind Interaction and Atmospheric Escape

2017
International ...
Brain, David A., Barabash, Sergey, Bougher, Stephen W., Durut, Firat, Jakosky, Bruce M., Modolo, Ronan   +5 more
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Escape of Planetary Atmospheres

2012
The extreme radiation and plasma environments during the period of the young active Sun/Stars have important implications for the evolution of planetary atmospheres and may be responsible that planets with a low gravity like early Mars most likely could never build up a dense atmosphere during the first few 100 Myr after their origin. On the other hand
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Photon escape probabilities in expanding atmospheres

Journal of Astrophysics and Astronomy, 1981
A comparison of mean number of scatterings and escape probabilities has been made in isotropic scattering and dipole scattering by using the angle-averaged partial frequency redistribution functionR I. We have solved the equations of radiative transfer and statistical equilibrium simultaneously in a spherically symmetric expanding ...
A. Peraiah, K. E. Rangarajan, D. Mohan Rao   +2 more
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Thermally driven atmospheric escape: Monte Carlo simulations for Titan's atmosphere

Planetary and Space Science, 2009
Abstract Recent models of Titan's upper atmosphere were used to reproduce the Cassini measurements of the density vs. altitude by allowing a net upward flow at the exobase. Large mass flow rates were extracted and interpreted due to thermally driven escape to space at a rate that is orders of magnitude larger than the Jeans escape rate.
Orenthal J. Tucker, R.E. Johnson
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An attractive problem on atmospheric escape

Journal of Chemical Education, 1980
A question on escape velocity is representative of the wealth of material that can be exploited from applying the gas laws to atmospheric and meteorological phenomenon.
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N2 escape rates from Pluto's atmosphere

Icarus, 2008
Abstract Hydrodynamic escape of N2 molecules from Pluto's atmosphere is calculated under the assumption of a high density, slow outflow expansion driven by solar EUV heating by N2 absorption, near-IR and UV heating by CH4 absorption, and CO cooling by rotational line emission as a function of solar activity. At 30 AU, the N2 escape rate varies from
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