Dayside pickup oxygen ion precipitation at Venus and Mars - Spatial distributions, energy deposition and consequences

Details Dayside pickup oxygen ion precipitation at Venus and Mars - Spatial distributions, energy deposition and consequences Dayside pickup oxygen ion precipitation at Venus and Mars - Spatial distributions, energy deposition and consequences

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.5457l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, April 1, 1991, p. 5457-5467.

Physics

91

Mars Atmosphere, Oxygen Ions, Particle Precipitation, Venus Atmosphere, Atmospheric Heating, Daytime, Exosphere, Solar Planetary Interactions, Solar Wind, Planets, Dayside, Pickup, Oxygen, Ions, Precipitation, Venus, Mars, Distribution, Energy, Flux, Spectra, Atmosphere, Altitude, Models, Production Rate, Symmetry, Deposition, Heating, Ionosphere, Scattering, Sputtering, Escape, Diagrams, Aeronomy, Patterns, Temperature, Collisions, Exosphere

Scientific paper

The fluxes and energy spectra of picked-up planetary O(+) ions incident on the dayside atmospheres of Venus and Mars are calculated. Maps of precipitating ion number flux and energy flux are presented which show the asymmetrical distribution of dayside energy deposition expected from this source. Although the associated heating of the atmosphere and ionosphere is found to be negligible compared to that from the usual sources, backscattered or sputtered neutral oxygen atoms are produced at energies which exceed that needed for escape from the gravitational fields of both planets. These neutral 'winds', driven by pickup ion precipitation, represent a possibly significant loss of atmospheric constituents over the age of the solar system.

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