Other
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh24a..01s&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SH24A-01
Other
2104 Cosmic Rays, 2114 Energetic Particles (7514), 2124 Heliopause And Solar Wind Termination, 2126 Heliosphere/Interstellar Medium Interactions, 2162 Solar Cycle Variations (7536)
Scientific paper
On August 30, 2007, Voyager 2 crossed the termination shock at 83.7 AU in the southern hemisphere, ~7 AU closer than the concurrent shock location in the northern hemisphere as modeled from the Voyager 1 crossing at 94 AU in December 2004. This suggests that the interstellar magnetic field presses inward in the southern hemisphere. Voyager 2 crossed the shock at least five times, with data acquired for three of the crossings that show a weak, highly variable supercritical shock and downstream wind speeds exceeding the thermal speed of ~30 km/s. The corresponding plasma temperature of only ~105 K was much lower than the predicted 106 K, indicating that the bulk of the solar wind kinetic energy was dissipated by heating and accelerating pickup ions rather than the solar wind ions. Nearly half of the energy dissipation occurred as the solar wind slowed upstream of the shock. Immediately downstream of the shock the intensity of 5 MeV H was ~4 times that concurrently observed by Voyager 1 deep in the heliosheath, showing that the spectra of termination shock particles at different regions of the shock can vary significantly. At higher energies, the intensity of anomalous cosmic ray He at ~16 MeV/nuc was lower than observed contemporaneously by Voyager 1 in the heliosheath, providing a direct measure of gradient in the heliosheath and indicating that the ACR source is elsewhere on the shock or deeper in the heliosheath. The gradient of 260 MeV/nuc galactic cosmic ray He in the heliosheath is much smaller than expected, suggesting that there must a larger gradient beyond 105 AU or that the local interstellar intensity is lower than predicted. These and other aspects of the Voyager observations near the shock and in the heliosheath will be reviewed.
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