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Reconnection at three dimensional magnetic null points: Effect of current sheet asymmetry
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10.1063/1.4804338
/content/aip/journal/pop/20/5/10.1063/1.4804338
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/5/10.1063/1.4804338
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) and (b) isosurface of at 25% of the maximum and the current flow in the  = 0 plane for the symmetric model. (c) and (d) the equivalent figures for the asymmetric model with  = 0.5 and  = 0.5 (see Eq. (20) ). Both have the parameter set .

Image of FIG. 2.
FIG. 2.

(a) and (b) in the  = 0 and  = 4 planes, respectively, for the symmetric model. (c) and (d) in the same planes for the asymmetric case with  = 0.5. The contours and arrows denote and , respectively. The spine is shown in blue as a line in the  = 0 plane and a square in the  = 4 plane. The fan plane is shown in red. The parameters are as in Figure 1 .

Image of FIG. 3.
FIG. 3.

Evolution of flux in the symmetric (a)–(c) and asymmetric (d)–(f) fan cases. For the parameter set given in Figure 1 .

Image of FIG. 4.
FIG. 4.

(a) and (b) isosurface of at 25% of the maximum and the current flow in the  = 0 plane for the symmetric model. (c) and (d) are the equivalent figures for the asymmetric model with  = 0.5. Both have the parameter set .

Image of FIG. 5.
FIG. 5.

(a) in the  = 0 plane with contours showing the strength of . The spine is in blue and the fan plane red. (b) evaluated on the fan plane ( = 0) with the dotted circle showing the cut taken in Figure 6 . (c) and (d) are the corresponding figures for the simple asymmetric case. For the parameters given in Figure 4 .

Image of FIG. 6.
FIG. 6.

with (a)  = 0, (b)  = 1, and (c)  = 3. To be compared against Figures 5(b) , 5(d) , and 10(b) , respectively. For the parameter set .

Image of FIG. 7.
FIG. 7.

(a) Integral loops constructed along paths either or to the magnetic field. Such paths enable potential drops ( ) along field lines crossing to be compared with flux movement in the ideal region. (b) The induced flux transport in the ideal region threading with the edge of depicted by blue lines.

Image of FIG. 8.
FIG. 8.

Reconnection rate diagram. The edge of a general asymmetric non-ideal region is shown in red on the fan plane. The points and lie between the positive and negative regions of flux transport across this plane. These points can be connected by a path through the ideal region around the edge of the large side of the non-ideal region ( ), around a path circuiting the small side ( ) or though the non-ideal region and the null ( ).

Image of FIG. 9.
FIG. 9.

The shape of the non-ideal region shown in red on the fan plane when . The distance indicates the length of the non-ideal region along the line .

Image of FIG. 10.
FIG. 10.

Asymmetric spine reconnection with  = 3. (a) Current flow in the  = 0 plane. (b) in the fan plane ( = 0) to be compared against Figure 6(c) . (c) (red) overlayed with (green). The overlaid dashed grid highlights the relationship between the two quantities.

Image of FIG. 11.
FIG. 11.

Log-log plots of , and vs . (a) when all other parameters are held fixed (given in Figure 6 ). (b) when a stall is introduced heuristically into (see Eq. (52) ).

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/content/aip/journal/pop/20/5/10.1063/1.4804338
2013-05-10
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Reconnection at three dimensional magnetic null points: Effect of current sheet asymmetry
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/5/10.1063/1.4804338
10.1063/1.4804338
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