Macrostructure of the Quasi-Parallel Shock and Magnetosheath: 1. Scale Lengths

Details Macrostructure of the Quasi-Parallel Shock and Magnetosheath: 1. Scale Lengths Macrostructure of the Quasi-Parallel Shock and Magnetosheath: 1. Scale Lengths

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm52b0575o&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM52B-0575

Physics

2154 Planetary Bow Shocks, 2728 Magnetosheath, 2753 Numerical Modeling, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

Recently, we have utilized global hybrid (fluid electrons, kinetic ions) simulations of solar wind interaction with magnetic dipoles of various strength to demonstrate the existence of a spectrum of magnetospheric structures. Starting with a simple whistler wake, increasing the dipole strength results in magnetospheric structures which grow in complexity until a terrestrial type magnetosphere is formed. This occurs when the system size is considerably larger than ion gyroradii, specifically when the standoff distance of the magnetopause is at least 20 times the solar wind proton skin depth. In this study, we use a similar approach to understand the macrostructures of the quasi-parallel shock and the magnetosheath and their evolution as a function of system size. These macrostructures are directly tied to ion kinetic processes and microinstabilities which occur in the ion foreshock and the magnetosheath. As a result, the spatial extent of both regions influence the nature of system. Our objective is to establish the spatial scales associated with various kinetic processes in the ion foreshock and the quasi-parallel magnetosheath and determine the spatial scales beyond which the system has a self-similar solution.

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