The location of the subsolar bow shock of Venus - Implications for the obstacle shape

Details The location of the subsolar bow shock of Venus - Implications for the obstacle shape The location of the subsolar bow shock of Venus - Implications for the obstacle shape

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985georl..12..627r&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 12, Oct. 1985, p. 627-630.

Physics

11

Bow Waves, Planetary Magnetospheres, Shock Waves, Space Plasmas, Venus (Planet), Gas Dynamics, Ionopause, Magnetosheath, Pioneer Venus Spacecraft, Solar Position, Solar Wind, Zenith, Venus, Bow Shock, Shape, Pioneer Venus Orbiter, Pvo, Altitude, Dynamics, Solar Wind, Models, Interactions, Ionopause, Layers, Mass, Plasma, Magnetosheath, Magnetosphere, Spacecraft Observations

Scientific paper

The rise in periapsis altitude with time has allowed the Pioneer Venus spacecraft to begin probing the subsolar Venus bow shock. This has allowed the altitude of the subsolar bow shock to be determined by in situ observations for the first time. The observed altitude of 2280 km at the nose together with the previously determined terminator altitude can be used to infer the shape of the obstacle using the gasdynamic model of the solar wind interaction with Venus. When this shape is compared to the measured locations of the Venus ionopause (defined as the point where the magnetosheath magnetic field pressure and ionospheric thermal pressures are equal), it is found that the observed ionopause position is too low to qualify as the obstacle. It is inferred that a layer of the mass loaded plasma in the magnetosheath forms the magnetic barrier.

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