Acceleration of the low-energy anomalous cosmic ray component observed by Voyager 2

Details Acceleration of the low-energy anomalous cosmic ray component observed by Voyager 2 Acceleration of the low-energy anomalous cosmic ray component observed by Voyager 2

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh23c..05f&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH23C-05

Physics

Plasma Physics

[2104] Interplanetary Physics / Cosmic Rays, [2124] Interplanetary Physics / Heliopause And Solar Wind Termination, [7807] Space Plasma Physics / Charged Particle Motion And Acceleration, [7851] Space Plasma Physics / Shock Waves

Scientific paper

Observations made by Voyager 2 during its crossing of the heliospheric termination shock featured signatures of diffusive shock acceleration of energetic ions occurring locally in the energy range between 0.5 MeV and 3 MeV. These include an exponential increase in intensities upstream of the shock, and the formation of an extended plasma precursor with a width of ~0.37 AU, assuming no systematic shock motion. Our theoretical analysis shows that energetic ions accelerated locally at the termination shock produced the plasma flow slowdown through diffusive scattering in the upstream region. The amount of deceleration in the precursor is about 13% (by dynamic pressure), which is consistent with earlier model predictions. We also discuss the subsequent evolution of the low-energy ACR component spectrum in the heliosheath in light of Voyager 2 observations. Plasma speed (top) and energetic ion pressure (bottom) from Voyager 2 observations near the termination shock. Solid lines show model results.

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