Implications of Generalized Rankine-Hugoniot Conditions for the PUI Population at the Voyager 2 Termination Shock

Details Implications of Generalized Rankine-Hugoniot Conditions for the PUI Population at the Voyager 2 Termination Shock Implications of Generalized Rankine-Hugoniot Conditions for the PUI Population at the Voyager 2 Termination Shock

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1302..133r&link_type=abstract

PICKUP IONS THROUGHOUT THE HELIOSPHERE AND BEYOND: Proceedings of the 9th Annual International Astrophysics Conference. AIP Con

Astronomy and Astrophysics

Astrophysics

1

Shock Waves, Solar Wind, Interstellar Magnetic Fields, Planetary Bow Shocks, Interplanetary Shocks, Particle Emission, Solar Wind, Magnetic And Electric Fields, Polarization Of Starlight

Scientific paper

The Rankine-Hugoniot (R-H) jump conditions at the heliospheric termination shock provide a means of knitting together the in situ measurements from Voyager 2 (VGR2) with the remote sensing of the heliosheath plasma via energetic neutral atom (ENA) imaging by IBEX and Cassini/INCA. The VGR2 instrument suite has a gap (~1-30 keV) in the ion measurements. While the ENA images (0.2-6 keV and 5-55 keV) fill the VGR2 gap in the pixel containing the VGR2 spacecraft, they do so only in the sense that they provide the ion intensity integrated along the radial line of sight throughout the entire heliosheath. The synthesis we attempt is further complicated by the observational results from all three spacecraft that the non-thermal component of the ion pressure dominates that of the thermal component. We therefore have developed (and applied) a generalized formulation of the R-H conditions that does not invoke an equation of state, but rather can directly ingest the instrumentally-measured non-thermal spectrum. The result is an estimate that the ratio (upstream/downstream) of the non-thermal pressure is ~43%, confirming anew that the termination shock (at least at VGR2) is strongly mediated by non-thermal ions.

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