Macrostructure of the Quasi-Parallel Shock and Magnetosheath: 2. Nature of the ULF Waves

Details Macrostructure of the Quasi-Parallel Shock and Magnetosheath: 2. Nature of the ULF Waves Macrostructure of the Quasi-Parallel Shock and Magnetosheath: 2. Nature of the ULF Waves

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm52b0576b&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM52B-0576

Physics

2159 Plasma Waves And Turbulence, 2728 Magnetosheath, 2772 Plasma Waves And Instabilities, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

In an accompanying presentation, global hybrid (fluid electrons, kinetic ions) simulations were utilized to demonstrate the existence of spatial scales beyond which quasi-parallel shocks and magnetosheath exhibit self-similar macrostructures. This implies that the results of the simulations should be directly applicable to spacecraft observations at planetary shocks and magnetosheaths. An interesting aspect of the simulation results is that despite the presence of large levels of ULF turbulence in the upstream, at the shock and the downstream regions a macrostructure can be attributed to the system. This macrostructure is associated with large scale, and fairly coherent, density and field fluctuations which populate most of the quasi-parallel magnetosheath. Preliminary analysis of the waves suggest that these fluctuations may be in both mirror (density and magnetic field anti-correlation) and fast magnetosonic (density and field correlation) modes. Here, we present a detailed analysis of the waves observed in the simulations to better understand their mode structure and origin, as well as their influence in modulating the magnetosheath. Comparison between simulation results and observations in the quasi-parallel magnetosheath is also provided.

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