Experimental and numerical studies on potential distributions in a plasma

Singh, Nagendra; Kist, R.; Thiemann, H.

doi:10.1088/0032-1028/22/7/006

Cited by 10 publications

(3 citation statements)

References 8 publications

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“…We further suggest that fluctuations observed in precipitating auroral electron fluxes [Evans, 1965;Lin and Hoffman, 1979a, b] could probably be explained by fluctuations of double layers. Singh and Thiemann [1980] applied the results of simulations of a very short plasma [d --65 ID] to explain some of the observations of Lin and Hoffman [1979a, b] and also some of those of Whalen and Daly [1979]. Recently, Silevitch [1981] applied the idea of the fluctuations of the current in plasma diodes [Burger, 1965] to explain some space observations [Berkey et al, 1980;Evans, 1967;Ternerin et al, 1979].…”

Section: Our Simulations Suggest An Explanation For the Puzzling Obsementioning

confidence: 99%

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Dynamical features of moving double layers

Singh¹,

Schunk²

1982

J. Geophys. Res.

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Results on the motion of double layers from numerical simulations are presented. It was observed that after their formation double layers move toward the high‐potential side. In simulations with sufficiently long plasmas, the moving double layer was found to occur along with a series of other plasma phenomena. These include electron beam plasma turbulence and resulting plasma heating, plasma evacuation, electron current and ion current interruptions and subsequent recoveries, and the acceleration of ‘trapped’ ions on the low‐potential side in an expanding plasma front moving with the double layer. Furthermore, we observed recurring formation and motion of double layers with the above plasma phenomena repeating periodically. In the largest simulated plasma of length d = 400 λD, where λD is the Debye length at the low‐potential end of the plasma, the double layers became supersonic with respect to the ion acoustic speed. The accelerated ‘trapped’ ions moving with the double layer and the free ions accelerated by the double layer created counterstreaming ions on the low‐potential side of the layer. The question of double layer motion in relation to current continuity across it is examined. The effect of ion current injection on the double layer motion is simulated. The motion of double layers as seen in our simulations are compared with results from other simulations and those from laboratory experiments. The relevance of the simulation results to space plasmas is discussed, demonstrating that several observed phenomena in space plasma are qualitatively similar to those seen in the simulations.

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Section: Our Simulations Suggest An Explanation For the Puzzling Obsementioning

confidence: 99%

“…The simulation technique is the same as previously described by Singh [1980] and Singh et al [1980]. Therefore, here we merely describe the salient features of the simulation technique.…”

Section: Simulation Techniquementioning

confidence: 99%

Dynamical features of moving double layers

Singh¹,

Schunk²

1982

J. Geophys. Res.

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“…In papers of SINGH (1980) andSINGH et al (1980) the results of numeric simulation of DL are given. The system of Vlasov's equations and Poisson's equation for the onedimensional case are solved.…”

Section: Low Potential Sidementioning

confidence: 99%

Active experiments in space, laboratory experiments and numerical simulation.

Podgorny

1982

J. geomagn. geoelec

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Studies of strong laboratory double layers and comparison with computer simulation

et al. 1981

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Strong electrostatic double layers were produced with a triple plasma configuration in the large plasma chamber (5 m long, 2·5 m diameter) at IPM in Freiburg, Federal Republic of Germany. Owing to relatively low densities (1011 1012m−3), Debye lengths of a few centimetres and layer thicknesses of the order of a metre were obtained. Layers both with and without magnetic fields were studied. Analysis of particle spectra prove that wave-particle interactions play a minor role in maintaining the strong electric field. The three-dimensional potential distribution is measured and is qualitatively discussed in terms of particle budget. For cases with a magnetic field it tends to agree with observations above the aurora. Comparisons are made with double-layer theory and computer experiments, and general agreement is found as far as the available results allow.

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Experimental and numerical studies on potential distributions in a plasma

Cited by 10 publications

References 8 publications

Dynamical features of moving double layers

Dynamical features of moving double layers

Active experiments in space, laboratory experiments and numerical simulation.

Studies of strong laboratory double layers and comparison with computer simulation

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