Physics – Plasma Physics
Scientific paper
Jun 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3411107l&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 11, CiteID L11107
Physics
Plasma Physics
2
Magnetospheric Physics: Cusp, Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Energetic Particles: Precipitating, Space Plasma Physics: Shock Waves (4455), Space Plasma Physics: Particle Acceleration
Scientific paper
A linkage between energetic ions in the bow shock and the cusp is established using a three-dimensional (3-D) self-consistent global hybrid simulation, for a case of the interplanetary magnetic field (IMF) condition favoring high-latitude magnetic reconnection and inter-connection between field lines in the quasi-parallel bow shock and the cusp. A diffuse ion distribution is obtained in the quasi-parallel shock and foreshock region, where large-amplitude waves and turbulence are present. Its energy spectrum is well described by an exponential function as in the case for upstream diffuse ions previously observed. These bow shock accelerated ions, upon being transmitted into the cusp region, form the bulk of cusp energetic ions. By tracing particles from the solar wind to the cusp, it is found that the source of acceleration for the cusp energetic ions is predominantly in the quasi-parallel shock and foreshock region, through a Fermi-type acceleration mechanism. Contribution to the cusp energetic ions from magnetosheath/cusp waves and magnetic reconnection appears relatively minor. Owing to the limitation of the model used, the magnetospheric source for energetic particles in the cusp cannot be fully investigated.
Chang Seo-Won
Lin Yangtin
Wang Xiang-Yu
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