Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh14a..02r&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH14A-02
Physics
[2126] Interplanetary Physics / Heliosphere/Interstellar Medium Interactions, [2164] Interplanetary Physics / Solar Wind Plasma
Scientific paper
Voyager 2 is now at 96 AU and provides the only direct observations of plasma in the heliosheath. I will present the most recent plasma observations and try to assimilate them with other Voyager measurements and observations at 1 AU. The heliosheath is highly variable on scales of tens of minutes in both plasma and magnetic field parameters. The distribution of plasma parameters is Gaussian; this enables us to determine flow directions as the flow angles approach the instrument cutoff. The plasma speeds observed at Voyager 2 remain well above those inferred at Voyager 1 at similar distances into the heliosheath. The Voyager 2 flows continue to divert toward the heliotail. The direction of flow is more in the T than N direction (using the RTN coordinate system). The density and temperature have decreased across the heliosheath until the beginning of 2011; since then the density has increased by a factor of 2 and the speed and temperature have also increased. These results will be compared to model predictions.
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