SP-349/396 PIONEER ODYSSEY
Figure 6-1. Fast streams of solar wind catch up with slow streams and produce scattering regions that prevent low energy cosmic rays from penetrating into the Solar System. The average velocity of the solar wind changes imperceptibly to the orbit of Jupiter but, as shown in the lower diagram, the range of fluctuations is remarkably diminished at this distance. Pioneer 10 and 11 might reach the boundary where this scattering effect ends and galactic cosmic rays would be expected to increase in intensity. To eight times Earth's distance from the Sun there is no sign of approaching such a boundary.
 
Figure 6-1. Fast streams of solar wind catch up with slow streams and produce scattering regions that prevent low energy cosmic rays from penetrating into the Solar System. The average velocity of the solar wind changes imperceptibly to the orbit of Jupiter but, as shown in the lower diagram, the range of fluctuations is remarkably diminished at this distance. Pioneer 10 and 11 might reach the boundary where this scattering effect ends and galactic cosmic rays would be expected to increase in intensity. To eight times Earth's distance from the Sun there is no sign of approaching such a boundary.

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