Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh13c..05f&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH13C-05
Physics
2114 Energetic Particles (7514), 2124 Heliopause And Solar Wind Termination, 7845 Particle Acceleration
Scientific paper
There is growing evidence that Anomalous Cosmic Rays (ACRs) are accelerated by stochastic acceleration in the heliosheath. However, most stochastic acceleration mechanisms are not appropriate. The energy density in the ACRs and in the interstellar pickup ions out of which the ACRs are accelerated greatly exceeds the energy density in the turbulence in the heliosheath. Thus, a traditional stochastic acceleration mechanism in which particles are accelerated by damping the turbulence will not work. We have developed a stochastic acceleration mechanism in which the total energy of the pickup ions and the ACRs is conserved. Energy is redistributed from the core pickup ions into a suprathermal tail to create the ACRs. A model for the acceleration of the ACRs in the heliosheath, based on this stochastic acceleration mechanism, is presented, which provides reasonable fits to the spectra of suprathermal particles and ACRs observed by Voyager.
Fisk Len A.
Gloeckler George
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