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Structure of the dissipation region in fluid simulations of asymmetric magnetic reconnectiona)
a)Paper JI1, Bull. Am. Phys. Soc. 53, 119 (2008).
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10.1063/1.3086867
/content/aip/journal/pop/16/5/10.1063/1.3086867
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/5/10.1063/1.3086867

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the dissipation region during asymmetric reconnection. Magnetic field lines are (blue) solid lines; velocity flow are (red) dashed lines. The points and mark the -line and the stagnation point, which are not necessarily colocated. Reprinted from Ref. 19.

Image of FIG. 2.
FIG. 2.

Two-fluid simulation with a magnetic field asymmetry of 2 and symmetric density (run ). (a) Out-of-plane magnetic field (grayscale) and magnetic field lines (white lines). (b) Out-of-plane current density (grayscale), with ion flow (white arrows) and electron flow (black arrows). Note that the two plots show different domains. (c) A cut across the -line showing the reconnecting magnetic field (solid black line), three times the ion (red dashed) and electron (blue dot-dashed) inflow speeds in the reference frame of the -line, and ten times the convection electric field (dot-dot-dot-dashed).

Image of FIG. 3.
FIG. 3.

Predicted and measured values for the half-thickness of the dissipation region during asymmetric Hall reconnection. The filled circle corresponds to the symmetric reference case ; the (blue) squares are runs with asymmetric ; the (red) diamonds are runs with asymmetric , and the asterisk is the run with both and asymmetric .

Image of FIG. 4.
FIG. 4.

Predictions vs simulation data for the dissipation region substructure: (a) , (b) , (c) , (d) , and (e) modified prediction for and . See Fig. 3 for symbol definitions.

Image of FIG. 5.
FIG. 5.

Scaling results for asymmetric density Sweet–Parker simulations. Plotted as a function of density ratio are the (a) reconnection rate (normalized to ), (b) outflow velocity (normalized to ), and (c) half-thickness of the dissipation region (normalized to ). The solid dots have ; the open box has . The dashed lines are the predictions from the theory.

Image of FIG. 6.
FIG. 6.

Distance from the stagnation point to the edge of the dissipation region above and below for asymmetric density Sweet–Parker simulations. Solid dots have ; the open box has . The dashed line denotes the two distances being equal. This result disagrees with Eq. (9). Data for and are almost identical (not shown).

Image of FIG. 7.
FIG. 7.

Schematic showing a newly reconnected flux tube. While pressure is balanced in the fluid sense, mixing between the plasmas will occur due to kinetic effects.

Image of FIG. 8.
FIG. 8.

Grayscale of the plasma density during two-fluid simulations with a density asymmetry of 2 (run ). (a) The upper half of the computational domain; (b) a zoom in of the outflow region denoted by the white box in (a).

Tables

Generic image for table
Table I.

Asymmetric Hall and Sweet–Parker reconnection simulations performed.

Generic image for table
Table II.

Measured quantities during asymmetric Hall reconnection simulations. See the text for normalization.

Generic image for table
Table III.

Measured quantities from the asymmetric density Sweet–Parker simulations. See the text for normalization.

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2009-03-24
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Structure of the dissipation region in fluid simulations of asymmetric magnetic reconnectiona)
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/5/10.1063/1.3086867
10.1063/1.3086867
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