Results 161 to 170 of about 6,471 (197)

Mercury's helium exosphere

Journal of Geophysical Research, 1975
A model He exosphere of Mercury is developed whose source derives from accretion of the small fraction of solar-wind He(++) that is captured by the magnetosphere and absorbed at the planetary surface. The model is based on a lunar analogy whereby the surface is saturated with He.
R. E. Hartle, S. A. Curtis, G. E. Thomas
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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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Lunar exospheric argon modeling

Icarus, 2015
Abstract Argon is one of the few known constituents of the lunar exosphere. The surface-based mass spectrometer Lunar Atmosphere Composition Experiment (LACE) deployed during the Apollo 17 mission first detected argon, and its study is among the subjects of the Lunar Reconnaissance Orbiter (LRO) Lyman Alpha Mapping Project (LAMP) and Lunar ...
Grava, Cesare, Chaufray, Jean-Yves, Retherford, K.D., Gladstone, G.R., Greathouse, T.K., Hurley, D.M., Hodges, R.R., Bayless, A.J., Cook, J.C., Stern, S.A.   +9 more
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Surface-Exosphere-Magnetosphere System Of Mercury

Space Science Reviews, 2005
Mercury is a poorly known planet, since the only space-based information comes from the three fly-bys performed in 1974 by the Mariner 10 spacecraft. Ground-based observations also provided some interesting results, but they are particularly difficult to obtain due to the planet’s proximity to the Sun.
Milillo, A., Wurz, P., Orsini, S., Delcourt, Dominique, Kallio, E., M. Killen, R., Lammer, H., Massetti, S., Mura, A., Barabash, S., Cremonese, Gabriele, A. Daglis, I., de Angelis, E., M. Di Lellis, A., Livi, S., Mangano, V., Torkar, K.   +16 more
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Rotating ion-exospheres

Planetary and Space Science, 1976
The density, parallel and perpendicular pressures and temperatures distributions of a collisionless thermal plasma trapped in a dipole magnetic field are described and discussed. The effect of rotation on the plasma distribution is illustrated. The relative population of the different types of trapped particles is shown to influence drastically the ...
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Monte-Carlo simulation of Callisto’s exosphere

Icarus, 2015
We model Callisto's exosphere based on its ice as well as non-ice surface via the use of a Monte-Carlo exosphere model. For the ice component we implement two putative compositions that have been computed from two possible extreme formation scenarios of the satellite.
Vorburger, A., Wurz, P., Lammer, H., Barabash, S., Mousis, O.   +4 more
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Detection of SO in Io's Exosphere

Science, 2000
The Galileo orbiter's close pass by Io in 1995 produced evidence for extensive mass loading of the plasma torus through the ionization of SO 2 . On 11 October 1999, Galileo passed even closer to Io, this time across the upstream side relative to the flow of magnetospheric plasma that corotates with Jupiter.
C T, Russell, M G, Kivelson
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Lorentzian ion exosphere model

Journal of Geophysical Research: Space Physics, 1996
Since observed velocity distributions of particles in the magnetosphere generally have a suprathermal tail instead of an exponential one, we propose to recalculate the density and temperature distributions in a nonrotating ion exosphere with a Lorentzian velocity distribution function (VDF) instead of a Maxwellian.
V. Pierrard, J. Lemaire
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Model of the polar ion-exosphere

Planetary and Space Science, 1970
A model of a polar ion-exosphere in which the geomagnetic field lines are open is developed. The electrostatic field in this region has been calculated by taking into account two fundamental conditions: (1) quasi-neutrality has to be satisfied everywhere in the exosphere; (2) escape fluxes of electrons and ions have to be equal.
Lemaire, J., Scherer, M.
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The Exospheric Systems of Saturn's Rings

Icarus, 1995
Abstract Because of collisional interaction with interplanetary meteoroids, the ring system of Saturn is supposedly a major source of neutral gas cloud in the inner saturnian system. We consider some new features brought about by the asymmetric impact geometry of the ring-meteoroid interaction.
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