Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh13c..04z&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH13C-04
Physics
2104 Cosmic Rays, 2114 Energetic Particles (7514), 2124 Heliopause And Solar Wind Termination, 2126 Heliosphere/Interstellar Medium Interactions, 2149 Mhd Waves And Turbulence (2752, 6050, 7836)
Scientific paper
One of the biggest surprising results from Voyager observations in the inner heliosheath is that anomalous cosmic rays do not appear to be accelerated at the termination shock region where the Voyager spacecraft have encountered. Various models of particle acceleration have been put forward to explain the production and transport of anomalous cosmic rays. Some of the models are based on the idea that plasma in the heliosheath is undergoing some strong compressions, either large scale systematic compression or stochastic compression in the form of turbulence. According to Parker transport equation, charged particles are accelerated any time when they pass through a region of compression. Repeated passages of compression region through spatial diffusion can make particles reach very high energies, which is a mechanism similar to shock acceleration. In this talk, results of detailed model calculation involving diffusive compression acceleration by large scale compression or stochastic turbulent compression of plasma in the heliosheath will be presented. Model requirements will be placed under the constraints of Voyager observations of anomalous cosmic rays and the power spectrum of an index close to -5 at low energies.
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