The supersonic (with respect to the interstellar medium) solar wind creates a heliospheric bubble around the Sun. A termination shock occurs where the wind abruptly slows and forms the heliosheath. Voyager 2 crossed the termination shock at 83.7 au in the southern hemisphere. The intensity of 4–5 MeV protons accelerated by the shock near Voyager 2 was three times that observed concurrently by Voyager 1, indicating differences in the shock at the two locations.
- Edward C. Stone
- Alan C. Cummings
- William R. Webber
