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Magnetohydrodynamic structure of a plasmoid in fast reconnection in low-beta plasmas
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Image of FIG. 1.
FIG. 1.

Time sequence of the velocity , overlaid by the magnetic field lines. The two panels stand for (a) at and (b) at . The white circles in the panel (b) indicate the locations where we analyzed shock parameters (see also Table I) (enhanced online). [URL: http://dx.doi.org/10.1063/1.3554655.1]10.1063/1.3554655.1

Image of FIG. 2.
FIG. 2.

Snapshots at , overlaid by magnetic field lines. (a) Plasma density . The arrows indicate plasma velocity: is projected to the length of 5. The inner box shows the smaller domain of and . (b) Plasma temperature in the upper half and the entropy measure in the bottom half.

Image of FIG. 3.
FIG. 3.

One dimensional cut of physical properties along the neutral line, . The reconnected magnetic field , outflow velocity , plasma pressure , and the density . The shadow indicates the region between the vertical slow shock and the fast shock .

Image of FIG. 4.
FIG. 4.

(a) One dimensional cut along . Normal velocity , tangential velocity , shock-frame normal velocity , and the shock-frame slow-mode velocity in the -direction. (b) Tangential magnetic field , pressure , and density . See the second vertical axis to measure .

Image of FIG. 5.
FIG. 5.

(a) Plasma density inside the plasmoid at . The white lines indicate magnetic field lines. The arrows indicate the plasma velocity in the moving frame of . The spatial length 2 corresponds to . (b) Profile of at in the front side (enhanced online). [URL: http://dx.doi.org/10.1063/1.3554655.2]10.1063/1.3554655.2

Image of FIG. 6.
FIG. 6.

The -profiles in different simulation runs: (a) , and (b) , .

Image of FIG. 7.
FIG. 7.

Schematic drawing of plasmoid structures: (1) Petschek slow shock (Ref. 3), (2) outer shell (slow shock) (Ref. 16), (3) intermediate shock (Ref. 18) and slow shock (Ref. 43), (4) fast shock (Refs. 11 and 13), (5) loop-top front (Ref. 13), (6) tangential discontinuity, (7) postplasmoid vertical slow shock (Ref. 32), (8) forward vertical slow shock (Sec. III D), (9) fast-mode wave front (Ref. 43), (10) shock-reflection (diamond-chain) (Ref. 32), (11) contact discontinuity (Sec. III C), (A) reconnection inflow, (B) outflow jet, (C) postplasmoid backward flow, (D) internal flow, and (E) flapping jet.


Generic image for table
Table I.

Rankine–Hugoniot analysis. The subscripts 1 and 2 denote the upstream and downstream quantities. The locations in the simulation domain [see also Fig. 1(b)], the shock normal vector , the shock velocity , the angle between and the upstream magnetic field , the upstream plasma beta, flow Mach numbers to fast, intermediate (Alfvén), and slow-mode speeds, and the temperature ratio. The asterisk sign (*) indicates unreliable results (see Sec. III F). The letter (S) indicates a slow shock, (F) is a fast shock, and (U) is unclassified.



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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetohydrodynamic structure of a plasmoid in fast reconnection in low-beta plasmas