HR: 0800h
AN: SM51A-1276    [Abstracts]
TI: Three-Dimensional Global Hybrid Simulation of Dayside Waves Associated With the Quasi-Parallel Bow Shock
AU: * Lin, Y
EM: ylin@physics.auburn.edu
AF: Auburn University, Physics Department, 206 Allison Laboratory, Auburn, AL 36849-5311 United States
AU: Wang, X
EM: xywang@physics.auburn.edu
AF: Auburn University, Physics Department, 206 Allison Laboratory, Auburn, AL 36849-5311 United States
AB: A 3-D global-scale hybrid simulation is carried out, for the first time, for dynamics of the dayside bow shock-magnetosphere system associated with the quasi-parallel bow shock. A case with IMF along the Sun-Earth line is examined in detail. First, the foreshock waves and the associated shock reformation process are investigated. In particular, the generation and structure of diamagnetic cavities, with a decrease in the magnetic field and density, in the foreshock of the quasi-parallel shock are discussed. Second, the interaction of the foreshock-originated pressure pulses with the dayside magnetosphere is simulated. The diamagnetic cavities that are generated in the turbulent foreshock due to the ion beam plasma interaction are found to lead to strong surface perturbations at the magnetopause. Third, the coupling between the pressure pulses and the magnetosphere is studied. The compressional waves are found to mode convert to shear Alfvén waves and kinetic Alfvén waves (KAWs) through the Alfvén resonance process in nonuniform plasmas. The shear Alfvén waves lead to field line resonance, which corresponds to the fundamental odd resonance wave number, and produce field-aligned currents in the dipole magnetospheric field.
DE: 2154 Planetary bow shocks
DE: 2159 Plasma waves and turbulence
DE: 2724 Magnetopause and boundary layers
DE: 2753 Numerical modeling
DE: 2784 Solar wind/magnetosphere interactions
SC: SPA-Magnetospheric Physics [SM]
MN: Fall Meeting 2005