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Electron dynamics in two-dimensional asymmetric anti-parallel reconnection
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10.1063/1.3646316
/content/aip/journal/pop/18/10/10.1063/1.3646316
http://aip.metastore.ingenta.com/content/aip/journal/pop/18/10/10.1063/1.3646316
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color) Geometry of Magnetosheath reconnection.

Image of FIG. 2.
FIG. 2.

(Color) Schematic illustration of how the acceleration potential, , causes the formation of a bi-directional beam distribution in the reconnection inflow region.

Image of FIG. 3.
FIG. 3.

(Color) Three dimensional sketch of the magnetic field line geometry typical of Hall reconnection. The reconnection electric field, E rec, provides important contributions to Φ because of the out-of-plane bending of the magnetic field lines.

Image of FIG. 4.
FIG. 4.

(a) The acceleration potential, Φ, evaluated as a function of n for B ∈{0.5, 1, 2}. The dashed line represents the Boltzmann scaling Φ ∝ log(n). (b) The parallel pressure, p , evaluated as a function of n for B ∈ {0.5, 1, 2}. The straight dashed line represents the Boltzmann scaling p = nT. (c) The perpendicular pressure, p , evaluated as a function of n for B/B ∈ {0.5, 1, 2}. The Boltzmann scaling p = nT, coincides with p (n) for .

Image of FIG. 5.
FIG. 5.

(a) Magnetic geometry of asymmetric reconnection. Our notation for the ambient distributions and field strength, f xx and B x , are shown, where subscript 1 (2) denotes the magnetosheath (magnetosphere). North and south are indicated by subscripts N and S, respectively. The black bars at the upper and lower boundaries of the simulation box indicate the positions where we apply Φ = 0. As indicated by the arrows, in the magnetosheath inflow the parallel electric fields generally point towards the reconnection region, while they are directed away from the reconnection region in the magnetospheric inflow. (b), (c) Form of the theoretically expected distributions for Φ < 0 (magnetosheath) and Φ > 0 (magnetosphere).

Image of FIG. 6.
FIG. 6.

(Color) (a) Magnetic flux tube of the northern exhaust (straightened out). The parallel electric and magnetic forces on the electrons generally accelerate electrons towards the magnetosheath. Electron trajectories are divided into four types. p 1N : passing electrons injected at the magnetosheath, wr: electrons injected at the magnetosheath that w ill r eflect, r: reflected electrons injected at and returning to the magnetosheath, and p 2N : passing electrons originating from the magnetosphere. (b) and (c) Distributions expected in the exhaust. In the limit considered here with no trapped trajectories, these will be nearly isotropic.

Image of FIG. 7.
FIG. 7.

(Color) Contours of constant B, n, E , and eΦ/T e . In the magnetosheath inflow and exhaust we generally have Φ < 0, whereas Φ > 0 in the magnetospheric inflow. Three field lines are selected for the analysis in Fig. 8. In addition 9 points are selected in (d) for which the electron distributions are displayed in Fig. 9.

Image of FIG. 8.
FIG. 8.

(Color) The three columns of subfigures display various quantities evaluated along the three field lines selected in Fig. 7. The quantities are shown as a function of l, where l is the in-plane distance measured along the respective field lines. (a), (d), (g) Magnetic field strength, B, and acceleration potential, Φ. (b), (e), (h) Number density n and the isotropic approximation, , where n is the value of n and where the Φ = 0 boundary condition is applied. (c), (f), (i) Parallel and perpendicular pressure.

Image of FIG. 9.
FIG. 9.

The three columns of subfigures display the electron distributions observed at three points for each of the three field lines selected in Fig. 7. The classes of electron trajectories are indicated by the notation introduced in Fig. 6.

Image of FIG. 10.
FIG. 10.

(Color) Comparison between the profiles of Φ and p /p observed in asymmetric reconnection (a) and (b) versus symmetric reconnection (c) and (d). Note that the coordinates used in (a) and (b) are representative for the magnetopause, whereas the coordinates used in (c) and (d) are representative for symmetric magnetotail reconnection.

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/content/aip/journal/pop/18/10/10.1063/1.3646316
2011-10-12
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electron dynamics in two-dimensional asymmetric anti-parallel reconnection
http://aip.metastore.ingenta.com/content/aip/journal/pop/18/10/10.1063/1.3646316
10.1063/1.3646316
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