Voyager 1 exited the solar wind at a distance of ∼85 au from the Sun

@article{Krimigis2003Voyager1E,
  title={Voyager 1 exited the solar wind at a distance of ∼85 au from the Sun},
  author={Stamatios M. Krimigis and R. Decker and Matthew E. Hill and Thomas P. Armstrong and G. Gloeckler and D. C. Hamilton and Louis J. Lanzerotti and Edmond C. Roelof},
  journal={Nature},
  year={2003},
  volume={426},
  pages={45-48}
}
The outer limit of the Solar System is often considered to be at the distance from the Sun where the solar wind changes from supersonic to subsonic flow. Theory predicts that a termination shock marks this boundary, with locations ranging from a few to over 100 au (1 au ≈ 1.5 × 108 km, the distance from Earth to the Sun). ‘Pick-up ions’ that originate as interstellar neutral atoms should be accelerated to tens of MeV at the termination shock, generating anomalous cosmic rays. Here we report a… 

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Enhancements of energetic particles near the heliospheric termination shock

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