Highest Intensity of Low-Energy Particles Observed in Outer Heliosphere as Voyager 1 Approaches 94 AU

Details Highest Intensity of Low-Energy Particles Observed in Outer Heliosphere as Voyager 1 Approaches 94 AU Highest Intensity of Low-Energy Particles Observed in Outer Heliosphere as Voyager 1 Approaches 94 AU

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh41b..04c&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH41B-04

Physics

2104 Cosmic Rays, 2114 Energetic Particles, Heliospheric (7514), 2124 Heliopause And Solar Wind Termination

Scientific paper

Beginning in mid-2002, the 2-3 MeV H intensity measured by the Cosmic Ray experiment on Voyager 1 (V1) (at 85.3 AU and 33.8oN) increased by a factor of ˜100 for ˜7 months, subsided for approximately 6 months, and then increased again to the highest intensities yet seen in the outer heliosphere, higher than have been recorded since solar energetic particles were observed at ˜15 AU in 1983. This type of activity was not observed at Voyager 2, some 18 AU closer to the Sun than is V1. The longevity of the enhanced intensities at V1 suggests that this is a durable feature of the outer heliosphere and not a transient phenomenon. The particles are thought to be coming from the termination shock of the solar wind. The anisotropy of the 3.3-7.8 MeV H particles is primarily outward from the Sun along the nominal interplanetary magnetic field line. Presumably, the field line along which the particles are streaming towards V1 intersects with the termination shock back along the direction to the Sun. We will report the latest observations of the energy spectra and anisotropies of these particles as Voyager 1 approaches 94 AU. This work was supported by NASA under contract NAS7-03001.

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