Observations of the Anisotropies of Enhanced MeV Ion Fluxes at Voyager 1 at ˜85 AU

Details Observations of the Anisotropies of Enhanced MeV Ion Fluxes at Voyager 1 at ˜85 AU Observations of the Anisotropies of Enhanced MeV Ion Fluxes at Voyager 1 at ˜85 AU

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh12b..07c&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH12B-07

Physics

2104 Cosmic Rays, 2114 Energetic Particles, Heliospheric (7514), 2124 Heliopause And Solar Wind Termination, 2134 Interplanetary Magnetic Fields

Scientific paper

From ˜2002 day 195 through 2003 day 38, the Cosmic Ray Subsystem (CRS) experiment on Voyager 1 (V1) at 85 AU and 34 degrees N recorded a large increase (factor of ˜100) in the intensity of protons with 2-3 MeV. There was no similar increase at Voyager 2 (V2) ( ˜68 AU and 24 degrees S) during this period. Large and variable field-aligned anisotropies of 3.3-7.8 MeV protons were observed during this period. The variable field direction resulted in large outward and inward radial components of the flow that were much larger than the Compton-Getting convective component. Although the average radial streaming for the entire period was small, it was dominated by the large positive and negative radial components of the field-aligned flows and is not a definitive indicator that V1 crossed the solar wind termination shock. The spectra of anomalous cosmic rays suggests that V1 was not at or beyond the main portion of the termination shock. This work was supported by NASA under contract NAS7-1407 and by JPL under contract 959167.

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