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Kinetic model of electric potentials in localized collisionless plasma structures under steady quasi-gyrotropic conditions
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10.1063/1.4747162
/content/aip/journal/pop/19/8/10.1063/1.4747162
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/8/10.1063/1.4747162
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Two examples for magnetic dips. The solid and dashed curves shown in the upper graph correspond to two different choices for , picked arbitrarily except that they have the same parameter (in addition to symmetry, single extremum and ). The lower graph shows the corresponding electric potentials given by Eq. (33) with fixed also.

Image of FIG. 2.
FIG. 2.

Parameter space vs. for magnetic dips and bumps as defined in the text. Shown are the regions that correspond to different qualitative shapes of the electric potential sketched inside the boxes. Same qualitative shapes are indicated by the same color. The region above the black curve is unphysical (negative plasma pressure), the green line separates magnetic dips () from magnetic bumps (), on the red curve changes sign, on the blue curve the two side minima on one side merge with the central extremum, and on the magenta line the side minima on one side disappear when their values reach 0.

Image of FIG. 3.
FIG. 3.

Two examples for magnetic steps. The solid and dashed curves shown in the upper graph correspond to two different choices for , picked arbitrarily except that they have the same parameter (in addition to monotonic increase with and ). The lower graph shows the corresponding electric potentials given by Eq. (33) with a fixed value of

Image of FIG. 4.
FIG. 4.

Parameter space vs. for magnetic steps. Shown are the regions that correspond to different qualitative shapes of the electric potential indicated in the boxes. Steps where decreases with (i.e., ) are left out, because these shapes can be reduced to corresponding shapes with by reversal of the axis and a renormalization.

Image of FIG. 5.
FIG. 5.

The figure provides an application of the present model to an earlier particle simulation (Section IV of Ref. 26, interval ). The upper graph shows the magnetic field profile. The lower graph gives the electric potential of the simulation (solid curve), the model curve based on simulation data (dashed line) and the adjusted model potential (fine-scale broken line). The parameter was determined by a minimum variance fit.

Image of FIG. 6.
FIG. 6.

This figure corresponds to Figure 5 for the second simulation (Section V of Ref. 26). The parameter was determined by a minimum variance fit.

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/content/aip/journal/pop/19/8/10.1063/1.4747162
2012-08-20
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Kinetic model of electric potentials in localized collisionless plasma structures under steady quasi-gyrotropic conditions
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/8/10.1063/1.4747162
10.1063/1.4747162
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