Solar-wind measurements near Venus

The velocity, temperature, and density of the protons in the solar wind are presented for the period when Mariner 2 was near Venus. From these data it is concluded that (a) Mariner 2 never penetrated any magnetosphere associated with Venus; (b) Mariner 2 was probably also outside any shock front associated with the supersonic motion of the solar wind past Venus; (c) the solar-wind intensity was not especially great during the time of Venus encounter; (d) any shock wave surrounding Venus was probably closer than about 25,000 km to the center of the planet at the subsolar point.

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