Possible explanations of anomalous spectra observed with Voyager 1 crossing the solar wind termination shock

Details Possible explanations of anomalous spectra observed with Voyager 1 crossing the solar wind termination shock Possible explanations of anomalous spectra observed with Voyager 1 crossing the solar wind termination shock

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..858..233l&link_type=abstract

PHYSICS OF THE INNER HELIOSHEATH: Voyager Observations, Theory, and Future Prospects; 5th Annual IGPP International Astrophysics

Astronomy and Astrophysics

Astrophysics

5

Composition, Energy Spectra And Interactions, Heliopause And Solar Wind Termination, Planetary Bow Shocks, Interplanetary Shocks, Particle Acceleration

Scientific paper

This study was done with a numerical modulation model containing an asymmetrical heliosphere, a heliosheath, and diffusive shock acceleration of cosmic rays as applied to the solar wind termination shock (TS). In order to give possible explanations for the recently observed spectra by the Voyager 1 spacecraft of the TS particles, galactic and anomalous cosmic rays, simultaneously, it was necessary to modify the model by changing: The latitudinal dependence of the compression ratio at the TS, the latitudinal dependence of the injection efficiency of pick-up ions at the TS, and allowing a stronger decrease with radial distance r of the solar wind speed V in the heliosheath than the usual V ~ 1/r2. Combining these scenarios have prominent effects on the acceleration of charged particles at and beyond the TS and can explain to a large extent the spectra observed at the position of the Voyager 1 spacecraft in the heliosheath.

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