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Stationary nontearing inertial scale electron magnetohydrodynamic instability
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic of how a localized instability can develop in an EMHD system with strong current density gradients. A localized electron flow perturbation in the direction of the current gradient displaces some of the background current due to the effect of electron inertia, resulting in a -field perturbation in the -plane. The same sheared background electron current then differentially rotates the perturbation and generates poloidal plasma currents, which reinforce the initial perturbation.

Image of FIG. 2.
FIG. 2.

Scaling of the instability growth rate (a) with for and and (b) with for .

Image of FIG. 3.
FIG. 3.

Profiles of the background current density (dashed line) and normalized eigenmode (solid line) from a quasilinear simulation with and . Full width at half maximum of the eigenmode is

Image of FIG. 4.
FIG. 4.

Scaling of the aspect ratio of the instability eigenfunction vs for and .

Image of FIG. 5.
FIG. 5.

Contour plots of (a) magnetic flux and (b) out-of-plane -field over the full computational domain from a simulation with after the nonlinear reconnection layer has fully developed.

Image of FIG. 6.
FIG. 6.

Reconnection region contour plots of out-of-plane current density are shown in panels (a) and (c) and poloidal electron flow vorticity are shown in panels (b) and (d) from two simulation runs with , panels (a) and (b), and , panels (c) and (d), after the nonlinear reconnection layer has fully developed.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Stationary nontearing inertial scale electron magnetohydrodynamic instability