An asymmetric solar wind termination shock

@article{Stone2008AnAS,
  title={An asymmetric solar wind termination shock},
  author={Edward C. Stone and Alan C. Cummings and Frank B. Mcdonald and Bryant C. Heikkila and N. K. Lal and William R. Webber},
  journal={Nature},
  year={2008},
  volume={454},
  pages={71-74}
}
Voyager 2 crossed the solar wind termination shock at 83.7 au in the southern hemisphere, ∼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… Expand
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The solar wind evolves as it moves outward due to interactions with both itself and with the circum-heliospheric interstellar medium. The speed is, on average, constant out to 30 AU, then starts aExpand
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References

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TLDR
Observations of the magnetic field structure and dynamics of the termination shock made by Voyager 2 on 31 August–1 September 2007 reveal a complex, rippled, quasi-perpendicular supercritical magnetohydrodynamic shock of moderate strength undergoing reformation on a scale of a few hours. Expand
Cool heliosheath plasma and deceleration of the upstream solar wind at the termination shock
TLDR
The termination shock is a weak, quasi-perpendicular shock that heats the thermal plasma very little and an unexpected finding is that the flow is still supersonic with respect to the thermal ions downstream of the termination shock. Expand
The Effects of a Local Interstellar Magnetic Field on Voyager 1 and 2 Observations
We show that an interstellar magnetic field can produce a north-south asymmetry in the solar wind termination shock. Using Voyager 1 and 2 measurements, we suggest that the angle α between theExpand
Acceleration of low-energy ions at the termination shock of the solar wind
The Voyager 1 investigators have reported that the spacecraft crossed the termination shock of the solar wind at 94 AU from the Sun. The intensity of low-energy ions (3 MeV nucleon-1) increasesExpand
Intense plasma waves at and near the solar wind termination shock
TLDR
The detection of intense plasma-wave electric fields at the solar wind termination shock is reported, and the spectrum of these waves is quantitatively similar to those observed at bow shocks upstream of Jupiter, Saturn, Uranus and Neptune. Expand
Possible explanations of anomalous spectra observed with Voyager 1 crossing the solar wind termination shock
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TLDR
It is reported that intensities of low-energy ions measured by Voyager 2 produce non-thermal partial ion pressures in the heliosheath that are comparable to (or exceed) both the thermal plasma pressures and the scalar magnetic field pressures. Expand
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Recent observations of an increase in energetic particle intensities on the Voyager 1 spacecraft, for several months in late 2002 to early 2003, suggest new phenomena associated with its approach toExpand
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We address the physics of intensity and anisotropy variations in energetic particles near the solar wind termination shock. We show that rapid, large-amplitude, and highly anisotropic particle eventsExpand
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TLDR
Electron plasma oscillations have been detected upstream of the solar wind termination shock by the plasma wave instrument on the Voyager 1 spacecraft, consistent with the spacecraft having crossed the termination shock into the heliosheath. Expand
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