Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm21a0769d&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM21A-0769
Other
2722 Forecasting, 2744 Magnetotail, 2788 Storms And Substorms, 7843 Numerical Simulation Studies
Scientific paper
Observations indicate that the magnetotail current sheet may reach a thickness comparable to an ion gyroradius prior to substorm onset. Thus, the stability properties of these thin current sheets is of interest to magnetotail dynamics. Currently, there is a great deal of controversy regarding this subject. For the regime of interest, fluid theory is heuristic at best while kinetic theory is notoriously difficult. On the other hand, kinetic simulations are difficult to interpret without some theoretical framework. This problem is exacerbated by the use of artificial values of the ion/electron mass ratio mi/m_e which are employed to reduce the large separation of time scales. In this work, we compensate for this difficulty by carefully combining two separate approaches. The first is an exact numerical solution to the linear Vlasov-Maxwell system. This provides accurate information concerning the linear eigenmodes at arbitrary values of mi/m_e but lacks any nonlinear effects. To compensate for this weakness, we employ explicit kinetic simulations which fully resolve all electron and ion scales. The mass ratio is varied between mi/m_e =16 - 256 and detailed comparisons are made with the linear Vlasov approach. Nonlinear modifications of the current sheet equilibrium due to lower hybrid fluctuations are observed and characterized. The stability properties of the modified equilibria are examined using the linear Vlasov code.
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