Physics
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979georl...6..581j&link_type=abstract
Geophysical Research Letters, vol. 6, July 1979, p. 581-584.
Physics
7
Daytime, Planetary Magnetospheres, Solar Wind, Venus Atmosphere, Electric Fields, Interplanetary Magnetic Fields, Magnetic Field Configurations, Planetary Ionospheres, Planetary Magnetic Fields, Plasma Interactions, Venus, Pioneer Venus, Magnetic Fields, Solar Wind, Ionosphere, Plasmas, Pressure, Flux Tubes, Shock, Hydromagnetics, Ions, Flow, Magnetosheath, Ionopause, Stratification
Scientific paper
A different type of interaction between the solar wind and the ionosphere of a non-magnetized planet suggested by the Pioneer Venus magnetic field measurements is presented. They found that the magnetic field of the shocked solar wind does not penetrate the ionosphere, and it appears that the latter acts approximately as a superconductor, excluding any substantial penetration of interplanetary magnetic field. Just beyond the ionopause is a magnetized region with little plasma whose magnetic pressure is approximately equal to the impact pressure of the solar wind. This suggests an interaction where the current system associated with the enhanced magnetic field region flows along the ionopause and is closed by currents in the shocked solar wind plasma, where the J times B forces slow down the plasma approaching the stagnation region and accelerate the plasma flowing away from it. Thus, the lack of magnetic constraint in the ionosphere would allow ionospheric plasma to flow freely from the day to the night side, and this flow could probably maintain the nighttime ionosphere.
Hanson William B.
Johnson Francis S.
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