Other
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..528..333k&link_type=abstract
ACCELERATION AND TRANSPORT OF ENERGETIC PARTICLES OBSERVED IN THE HELIOSPHERE: ACE 2000 Symposium. AIP Conference Proceedings, V
Other
4
Cosmic Rays, Neutrino, Muon, Pion, And Other Elementary Particles, Cosmic Rays
Scientific paper
Observations from the Low Energy Charged Particle (LECP) instrument on the Voyager 1 (VI) spacecraft at ~70 AU during the last solar minimum revealed an excess of counts from the sunward direction in the nominal proton energy range ~40 to ~140 keV. This, above background, response was also seen by Voyager 2 at ~55 AU and was present during the previous solar minimum at VI at ~28 AU. The angular distribution is inconsistent with these counts being due to hot protons convected into the sunward-viewing sector only. We have examined possible sources for the observed counts and have considered that they may be due to singly-ionized heavy (A>=16) ions picked up by the solar wind and convected into the sunward sector of the detector. The spectrum is steep (dj/dE~E-6), and exhibits a cutoff at ~25 keV/nuc. This observation suggests that pickup ions may be present beyond 5 AU, and could be the pre-accelerated seed population for anomalous cosmic rays (ACR). .
Decker Robert B.
Gloeckler George
Hamilton Douglas C.
Krimigis Stamatios M.
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