Unusual Energetic Particle Signatures as Voyager 1 Approaches the Heliospheric Termination Shock

Details Unusual Energetic Particle Signatures as Voyager 1 Approaches the Heliospheric Termination Shock Unusual Energetic Particle Signatures as Voyager 1 Approaches the Heliospheric Termination Shock

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh12b..02m&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH12B-02

Physics

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

Scientific paper

The heliospheric termination shock is the expected site for the acceleration of anomalous cosmic rays and the further re-acceleration of low energy particles from the inner solar system and of galactic cosmic rays. Increases in the intensity of these diverse energetic particle populations are one of the expected harbingers of Voyagers approach to the termination shock. In mid-2002 as Voyager 1 moved beyond 85 AU there began an increase of 2-3 MeV ions that remained at an unusually high level near 0.1 protons/cm2 - s - sr - MeV ions for some 6 months. This event differs from any previously observed in that there is a simultaneous increase in galactic cosmic ray ions and electrons, anomalous cosmic rays and low energy ions. However the low intensity level and the spectral form of the anomalous cosmic ray component indicates that we have not reached the termination shock and the observed increase is a precursor event of the type expected as Voyager approaches the shock. Beginning in 2003.09 the unusual increases are abruptly terminated by the passage of a large interplanetary transient.

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