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Published 2003 | Published
Book Section - Chapter Open

The Approach of Voyager 1 to the Termination Shock


From 2001 to 2002 the anomalous cosmic ray (ACR) He intensity at 52 MeV/nuc increased by a factor of ∼2.2 at Voyager 1. The increase was larger at lower energies, indicating that Voyager 1 was 7.5±2.2 AU closer to the termination shock in 2002. Since Voyager 1 moved outward 3.8 AU during this time, it appears the shock moved inward 3.7±2.2 AU following short term transient motions outward during solar maximum.

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Copyright 2003 by Universal Academy Press, Inc. This work was supported by NASA under contract NAS7-1407.

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August 19, 2023
October 20, 2023