Position and shape of the Venus bow shock - Pioneer Venus Orbiter observations

Details Position and shape of the Venus bow shock - Pioneer Venus Orbiter observations Position and shape of the Venus bow shock - Pioneer Venus Orbiter observations

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979georl...6..901s&link_type=abstract

Geophysical Research Letters, vol. 6, Nov. 1979, p. 901-904.

Physics

2

Bow Waves, Shock Waves, Solar Wind, Magnetometers, Pioneer Venus 1 Spacecraft, Satellite-Borne Instruments, Shapes, Venus Atmosphere, Venus, Bow Shock, Shape, Position (Location), Pioneer Venus Orbiter, Magnetometer, Comparisons, Magnetopause, Solar Wind, Pressure, Flow, Ionopause, Dynamics, Data, Magnetosphere

Scientific paper

Magnetometer data from the Pioneer Venus Orbiter is used to examine the position and shape of this planet's bow shock. Utilizing crossings identified on 86 occasions during the first 65 orbits a mean shock surface is defined for sun-Venus-satellite angles of 60-110 deg. Both the shock shape and variance in location are found to be very similar to the terrestrial case for the range in SVS angle considered. However, while the spread in shock positions at the earth is due predominantly to the magnetopause location varying in response to solar wind dynamic pressure, ionopause altitude variations can have little effect on total obstacle radius. Thus, the Cytherean shock is sometimes observed much closer to or farther from the planet than previously predicted by gasdynamic theory applied to the deflection of flow about a blunt body which acts neither as source nor sink for any portion of the flow.

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