Instability at the electron inertial scale

Details Instability at the electron inertial scale Instability at the electron inertial scale

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10621623s&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A10, p. 21623-21644

Physics

Plasma Physics

18

Magnetospheric Physics: Auroral Phenomena, Space Plasma Physics: Kinetic And Mhd Theory, Space Plasma Physics: Waves And Instabilities

Scientific paper

Current sheets having a transverse scale near the electron inertial length c/ωp are shown to be unstable. Two general classes of modes are found to occur, the single and double tearing modes and a current shear driven current-convective interchange mode. The tearing modes are global modes that relax the equilibrium to a lower magnetic energy state. The current-convective interchange mode is localized near points at which k.B0=0. The interchange mode has features in common with the collisionless tearing modes but is a local rather than global instability. An extensive analysis of the linear stability is presented, and the results are confirmed from linear initial value and eigenvalue calculations. Nonlinear three-dimensional initial value simulations are performed to determine the effects of the mode on the equilibrium. The δE/δB spectrum of the field fluctuations is computed and compared to satellite observations. The results support the hypothesis that short-scale broadband extremely low-frequency (BBELF) waves associated with Alfvénic structures are possibly the result of current decay through the electromagnetic current-convective instability.

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