The Proximity of Voyager 1 to the Termination Shock

Details The Proximity of Voyager 1 to the Termination Shock The Proximity of Voyager 1 to the Termination Shock

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh21a0483s&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH21A-0483

Physics

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

Scientific paper

The two Voyager spacecraft have observed the radial dependence of the modulation of anomalous cosmic rays (ACRs) during three solar maxima for radial distances ranging from ~10 to ~80 AU. At solar maximum, the large scale gradient for ~2 GV ACR oxygen is about four times that observed during solar minimum. Gradients between Voyager 1 and 2 were also determined for individual periods during the most recent solar minimum and solar maximum as the location of Voyager 1 increased from 65 to 84 AU. Comparison of the outward extrapolation of these gradients indicates that at the beginning of 2002 the termination shock was within ~92 AU, assuming that the source intensity at the shock at the latitude of Voyager 1 has not increased since solar minimum. With Voyager 1 approaching 87 AU, there should be increasing evidence for the proximity of the shock. This work was supported by NASA under contract NAS7-1407.

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