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Scaling of asymmetric reconnection in compressible plasmas
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10.1063/1.3429676
/content/aip/journal/pop/17/5/10.1063/1.3429676
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/5/10.1063/1.3429676

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the reconnection site for asymmetric reconnection.

Image of FIG. 2.
FIG. 2.

Compression factor of the reconnection rate as function of the plasma beta in the high-field inflow region, , for and various magnetic field ratios .

Image of FIG. 3.
FIG. 3.

Maximum reconnection rates as function of resistivity for symmetric reconnection with two values of in the inflow region. (a) Normalized based on the Cassak–Shay formula for the incompressible limit and (b) scaled by including the compression factor given by Eq. (28).

Image of FIG. 4.
FIG. 4.

Maximum reconnection rates as function of resistivity for (left) driven and (right) nondriven cases defined in Table I. Different normalizations are indicated in the figure: the top panels [(a) and (b)] are based on the Cassak–Shay formula for the incompressible limit, while the reconnection rates in the bottom panels [(c) and (d)] are scaled by including the compression factor given by Eq. (28).

Image of FIG. 5.
FIG. 5.

Energy transfer as function of time for nondriven symmetric cases with and : (a) for and (b) for . (solid lines), (dashed lines), and (dash-dotted lines) represent the differences between outgoing and incoming enthalpy flux, bulk kinetic energy flux, and Poynting flux, respectively, integrated over the boundaries of a box and . The dotted lines represent the net energy flux into or out of the box.

Image of FIG. 6.
FIG. 6.

Energy transfer as function of time for four nondriven asymmetric cases A–D defined in Table I [corresponding to panels (a)–(d)] with and . (solid lines), (dashed lines), and (dash-dotted lines) represent the differences between outgoing and incoming enthalpy flux, bulk kinetic energy flux, and Poynting flux, respectively, integrated over the boundaries of a box and in cases A and B, in cases C and D. The dotted lines represent the net energy flux into or out of the box.

Image of FIG. 7.
FIG. 7.

Snapshots of the velocity components , normalized by the predicted outflow speed (15), and the pressure for cases A and C (Table I) at and , respectively. Black contours are magnetic field lines. The white rectangles indicate the box used for integration of the fluxes shown in Fig. 6. The heavy lines represent paths of fluid elements that end at in the region of fast outflow. White dots indicate the starting points of two orbits chosen for Fig. 8.

Image of FIG. 8.
FIG. 8.

Forces in the direction as function of for two paths of cases A and C (Table I) indicated by white dots in Fig. 7, respectively. Solid lines show the Lorentz force and dashed lines the pressure gradient force.

Image of FIG. 9.
FIG. 9.

Velocity (top) and density (bottom) for case C in the plane at , using , , and . Solid heavy lines in the right half of the figure indicate streamlines. The dashed rectangle indicates the width of the outflow region for a chosen half-length .

Image of FIG. 10.
FIG. 10.

Schematic of the reconnection site including two outflow regions with the widths and , respectively. Solid lines represent magnetic field lines and dashed lines are streamlines. The dash-dotted lines separate inflow and outflow regions. The displacement between x-point and flow stagnation point, which is of the order of the size of the diffusion region is disregarded.

Tables

Generic image for table
Table I.

Initial parameters for four asymmetric cases.

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/content/aip/journal/pop/17/5/10.1063/1.3429676
2010-05-19
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Scaling of asymmetric reconnection in compressible plasmas
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/5/10.1063/1.3429676
10.1063/1.3429676
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