Small Residual Modulation of >2.5 GV Anomalous Cosmic Rays at 81 AU

Details Small Residual Modulation of >2.5 GV Anomalous Cosmic Rays at 81 AU Small Residual Modulation of >2.5 GV Anomalous Cosmic Rays at 81 AU

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh22a0747s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH22A-0747

Physics

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

Scientific paper

The flux of >13 MeV/nuc anomalous cosmic ray oxygen observed by ACE at 1 AU has been reduced by a factor of more than sixty during the current solar maximum. However, the recent arrival of solar maximum conditions in the outer heliosphere has resulted in a reduction of less than factor of two at Voyager 1 at 81 AU. This indicates there is little residual modulation between Voyager 1 and the ACR source at the termination shock for ions with rigidities greater than 2.5 GV. The modulation between Voyager 1 and Voyager 2 at 64 AU is somewhat larger, suggesting that Voyager 1 is closer to the shock than to Voyager 2. The most recent observations will be compared with model calculations to estimate the remaining distance between Voyager 1 and the termination shock. This work was supported by NASA under contract NAS7-1407.

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