An asymmetric solar wind termination shock
Top Cited Papers
- 1 July 2008
- journal article
- Published by Springer Science and Business Media LLC in Nature
- Vol. 454 (7200), 71-74
- https://doi.org/10.1038/nature07022
Abstract
Voyager 2 crossed the solar wind termination shock at 83.7 au in the southern hemisphere, approximately 10 au closer to the Sun than found by Voyager 1 in the north. This asymmetry could indicate an asymmetric pressure from an interstellar magnetic field, from transient-induced shock motion, or from the solar wind dynamic pressure. Here we report that 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. (Companion papers report on the plasma, magnetic field, plasma-wave and lower energy particle observations at the shock.) Voyager 2 did not find the source of anomalous cosmic rays at the shock, suggesting that the source is elsewhere on the shock or in the heliosheath. The small intensity gradient of Galactic cosmic ray helium indicates that either the gradient is further out in the heliosheath or the local interstellar Galactic cosmic ray intensity is lower than expected.Keywords
This publication has 23 references indexed in Scilit:
- Diffusive Acceleration at the Blunt Termination ShockThe Astrophysical Journal, 2008
- A Forecast of the Heliospheric Termination-Shock Position by Three-dimensional MHD SimulationsThe Astrophysical Journal, 2007
- Termination Shock Asymmetries as Seen by theVoyagerSpacecraft: The Role of the Interstellar Magnetic Field and Neutral HydrogenThe Astrophysical Journal, 2007
- Acceleration of Low‐Energy Ions at the Termination Shock of the Solar WindThe Astrophysical Journal, 2006
- The Effects of a Local Interstellar Magnetic Field onVoyager 1and2ObservationsThe Astrophysical Journal, 2006
- Possible explanations of anomalous spectra observed with Voyager 1 crossing the solar wind termination shockAIP Conference Proceedings, 2006
- Voyager 1 in the Foreshock, Termination Shock, and HeliosheathScience, 2005
- Crossing the Termination Shock into the Heliosheath: Magnetic FieldsScience, 2005
- Voyager 1 Explores the Termination Shock Region and the Heliosheath BeyondScience, 2005
- Electron Plasma Oscillations Upstream of the Solar Wind Termination ShockScience, 2005