Physics
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aipc..719..133k&link_type=abstract
PHYSICS OF THE OUTER HELIOSPHERE. AIP Conference Proceedings, Volume 719, pp. 133-138 (2004).
Physics
3
Particle Emission, Solar Wind, Interplanetary Magnetic Fields, Solar Wind Plasma, Sources Of Solar Wind, Planetary Bow Shocks, Interplanetary Shocks
Scientific paper
The most recent data from Voyager 1 (V1) show that a second event (TS2), apparently associated with the termination shock (TS), is in progress, with spectral characteristics similar to the energetic particle increase observed from 2002.4-2003.1 (TS1). We concentrate on the pressure, composition, and anisotropy profiles of TS1. The magnetic field pressure is significantly smaller than the particle pressure perpendicular to the interplanetary magnetic field (IMF) in the 40-4000 keV range. The composition during the interplanetary shock event (ISE) observed by V1 during 1991 is drastically different from that during TS1 (C/O ~0.2 for ISE, ~0.02 for TS1). The dominant anisotropy during TS1 is azimuthally in the outward direction for a Parker spiral field, suggesting a source inward of the spacecraft, while the radial anisotropy is consistent with zero (-0.024 +/- 0.02), implying a slow (<50 km/s) plasma flow speed. We conclude that the totality of the data is consistent with V1 being in the heliosheath during TS1.
Decker Robert B.
Hill Matthew E.
Krimigis Stamatios M.
Roelof Edmond C.
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