Physics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.2305s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, Dec. 1991, p. 2305-2308.
Physics
31
Ionospheric Heating, Solar Planetary Interactions, Solar Wind, Venus (Planet), Wave-Particle Interactions, Electron Energy, Ionopause, Oxygen Ions, Pioneer Venus Spacecraft, Planetary Magnetic Fields, Planetary Magnetospheres
Scientific paper
The results are presented of a study, which analyzed data from 10 Pioneer Venus orbits in order to see whether similar wave particle interaction processes also exist in the corresponding region around Venus. The first conclusion is that the apparent physical processes in the mantle are indeed similar around Venus and Mars. The planetary thermal O(+) ions outside the ionopause interact with the shocked solar wind and excite electrostatic waves close to the lower hybrid frequency. These waves propagate inwards, heating first the electron and deeper down in the ionosphere the thermal ion population. The observed superthermal ions are believed to be the product of this wave particle interaction process. It is also concluded that the wave energy transferred to the thermal electrons is of the right magnitude (about 4 x 10 exp 9 eV/sq cm s) to provide the supplemental heat source necessary to reconcile observed and calculated electron temperatures in the ionosphere.
Kasprzak Wayne T.
Nagy Andrew F.
Sagdeev Roal'd. Z.
Shapiro V. S.
Shevchenko V. I.
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