Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh24a..06g&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SH24A-06
Physics
2451 Particle Acceleration, 7807 Charged Particle Motion And Acceleration, 7851 Shock Waves (4455), 7863 Turbulence (4490)
Scientific paper
Recent observations of energetic charged particles made by the Voyager spacecraft have provided new challenges to the standard paradigms for energetic-particle transport and acceleration in the outer heliosphere and at the termination shock of the solar wind. For example, prior to the crossing of the termination shock by the two Voyager spacecraft, it was widely expected that the intensity spectrum of high-energy charged particles would become a power law with energy, consistent with the predictions of the well known theory of diffusive shock acceleration. As each spacecraft crossed the shock, however, the higher-energy part of the spectrum remained "modulated" behind the shock, just as was seen in the solar wind, before the shock crossings, for many years. There has yet to be a consensus theory that explains this observation, even though a few promising ideas have emerged. In addition, it is clear that the high-energy charged particles have provided valuable information about the global structure of the termination shock, and heliosphere itself. In this review, I will discuss the various theories for the shape of the energetic particle spectrum near the termination shock, and new insights into the global structure of the termination shock gained from recent measurements of the intensity and anisotropies of high-energy particles.
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