Global hybrid simulations of the ion foreshock

Details Global hybrid simulations of the ion foreshock Global hybrid simulations of the ion foreshock

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh53b..03o&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SH53B-03

Physics

2154 Planetary Bow Shocks, 2753 Numerical Modeling, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

The ion foreshock is a dynamic region with many linear and nonlinear plasma processes which lead to a variety of observables such as ion beams, ULF waves and cavity structures. Local spacecraft observations and theory/simulation studies have investigated many individual processes in the foreshock. Global hybrid (kinetic ions, fluid electrons) simulations of the bow shock and associated foreshock provide a collective picture of these processes and how they interact together. These simulations also allow us to understand how the structure of the foreshock and the processes contained in it vary as a function of solar wind conditions such as, the direction of the interplanetary magnetic field (IMF). In this talk, results from global hybrid simulations of the ion foreshock, for northward, southward, radial and intermediate IMF directions are presented and the differences and similarities discussed. Emphasis will be on the origin, evolution and consequences of 30 second sinusoidal waves and shocklets, various ion beam populations, as well as, foreshock cavities. In addition, issues regarding the coupling between the foreshock, bow shock, magnetosheath and the magnetopause are discussed. This coupling has direct impact on the nature of solar wind magnetosphere interaction and involves processes propagating in both directions. Namely, it is demonstrated that foreshock phenomenon influence processes at the magnetopause and visa-versa where reconnection at the magnetopause directly modifies ion foreshock structure and dynamics.

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