Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh13b1984t&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH13B-1984
Physics
[2102] Interplanetary Physics / Corotating Streams, [2114] Interplanetary Physics / Energetic Particles, [2139] Interplanetary Physics / Interplanetary Shocks, [2152] Interplanetary Physics / Pickup Ions
Scientific paper
A corotating interaction region (CIR), where a high-speed solar wind catches up a slow wind ahead, is one of the major site of particle acceleration in the heliosphere. It has been observationally known that CIR events generate suprathermal tails in the energy distribution (keV - MeV range), which are associated with acceleration at the boundary (forward/reverse) shocks. The intensity profile of these energetic particles often exhibits the asymmetry that the reverse shock more efficiently accelerates particles than the forward shock. Recently, Tsubouchi (2011) performed the hybrid simulation on a nonstationary evolution of CIR and showed that the reverse shock experiences the transition to a quasi-parallel geometry as a consequence of the solar wind adiabatic expansion. The quasi-parallel reverse shock can accelerate low-energy thermal particles in the suprathermal range (tens of keV) via a well-known Fermi process. On the other hand, interplanetary pickup ions are considered to be another fundamental source of CIR energetic particles, which may also account for the energetic asymmetry between the forward and reverse shock. This is because the energy of pickup ions is larger in the fast solar wind than in the slow wind. In the present study, we extend the simulation model of Tsubouchi (2011) by including the pickup ion dynamics. We will examine the characteristic of pickup ion acceleration according to the different phase of the CIR development. Particular attention is paid to the competing process of distributing energy with the thermal solar wind component.
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