Kavli Center for Astrophysics and Space Science

Shafter, MA, United States

Kavli Center for Astrophysics and Space Science

Shafter, MA, United States

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Richardson J.D.,Kavli Center for Astrophysics and Space Science
AIP Conference Proceedings | Year: 2010

This paper describes recent results from Voyager 2 in the heliosheath (HSh). The speed has been constant across the HSh. The density and temperature have decreased, probably due both to a decrease in solar output and deflection of plasma toward the heliotail. Fluctuations in the speed are smaller than in planetary magnetosheaths, probably because of the large size of the HSh reduces the affect of boundary motions. Density and temperatures variations are similar to those in magnetosheaths, suggesting small scale shock oscillations are the similar at bow shocks and the termination shock. Flows are very different at Voyager 1 and Voyager 2; the Voyager 2 data differ from model predictions. © 2010 American Institute of Physics.


Richardson J.D.,Kavli Center for Astrophysics and Space Science
AIP Conference Proceedings | Year: 2013

This paper reviews recent results from the Voyager spacecraft in the heliosheath. The speed observed at Voyager 2 (V2) has been constant across the heliosheath, but the flow is turning significantly toward the heliotail. The V2 density and temperature decreased in 2008 and stayed low until 2011 when the density increased by a factor of 2 and the temperature by 40%, possibly signaling the departure of solar minimum conditions from the heliosheath. The plasma flux at V2 has increased relative to that at Wind at 1 AU, possibly a solar cycle effect. The magnetic flux is expected to be constant through the heliosphere. At V2 this flux is constant, but at V1 the magnetic flux decreases by nearly an order of magnitude from 2007-2011 even when non-radial flow is taken into account. One possible cause is removal of magnetic flux by reconnection in the heliosheath. © 2013 AIP Publishing LLC.

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