Foreshock cavities and ULF waves under radial IMF geometry

Details Foreshock cavities and ULF waves under radial IMF geometry Foreshock cavities and ULF waves under radial IMF geometry

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm54a..07b&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM54A-07

Physics

2154 Planetary Bow Shocks, 2159 Plasma Waves And Turbulence, 2728 Magnetosheath, 2772 Plasma Waves And Instabilities (2471)

Scientific paper

We use global hybrid (kinetic ions, fluid electrons) simulations to study the solar wind interaction with earth's magnetosphere for a radial IMF geometry. Global hybrid simulations provide a collective picture of processes taking place in the foreshock, bow shock and magnetosheath. Because ions are treated as particles, these codes also give information on ion-scale microphysics allowing us to understand how kinetic phenomena modulate global characteristics. Under radial IMF geometry the foreshock forms in front of the dayside magnetosphere, and the plasma convecting downstream is very perturbed. We study the origin and evolution of foreshock ULF waves and density cavities or holes, as well as their associated ion distributions. Density cavities are accompanied by magnetic depressions and are believed to be formed when an isolated collection of interplanetary magnetic field lines connect to quasi-parallel regions of the bow shock, allowing energetic ions to flow upstream and excavate a local cavity. We investigate what happens to ULF waves and cavities as they are transmitted through the shock into the magnetosheath and how they influence magnetosphere dynamics. Finally, simulation results are compared with observations.

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