Observations of Solitary Structures in a Magnetized, Plasma Loaded Waveguide

Lynov, Jens-Peter; Michelsen, Poul; Pécseli, H. L.; Rasmussen, Jens Juul; Saeki, Koichi; Turikov, V. A.

doi:10.1088/0031-8949/20/3-4/005

Cited by 127 publications

(63 citation statements)

References 17 publications

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“…3). We find evidence for phase space coalescence of the phase space vortices, but this is in almost all cases a transient event, in contrast to other related studies, where coalesce is often an irreversible event Lynov et al, 1979Lynov et al, , 1980. Here we are considering a boundary value problem, i.e.…”

Section: Discussionmentioning

confidence: 85%

“…for ω ce ≥ω pe for electron holes, and ci ≥ pi for their ion counterparts ). These conditions are only sometimes fulfilled in space plasmas, but very easily in laboratory plasmas Lynov et al, 1979), and for a phase space vortex to be observed by a spacecraft, we expect it has to be close to the generation region. It is, however, only in some cases that a generation mechanism can be identified simultaneously with observations of phase space structures.…”

Section: Discussionmentioning

confidence: 99%

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Phase space structures generated by absorbing obstacles in streaming plasmas

Guio

Pécseli

2005

Ann. Geophys.

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Abstract. The dynamic behavior of a collisionless plasma flowing around an obstacle is investigated by numerical methods. In the present studies, the obstacle is formed by an absorbing cylinder, and a 2-D electrostatic particle-in-cell simulation is used to study the flow characteristics, with extensions to a fully 3-D generalization of the problem demonstrated as well. The formation of irregular filamented density depletions, oblique to the flow, is observed. The structures form behind the obstacle, in a region with a strong velocity shear, but also other instability mechanisms can be identified. The dynamics of these structures is highly dependent on the physical parameters of the plasma, and they can either be quasi-stationary or undergo a dynamic evolution. The structures are found to be associated with phase-space vortices, observed especially in the phase space spanned by the velocity direction perpendicular to the flow and the spatial coordinate in the same direction. The bias of the obstacle with respect to the plasma potential is found to be an important parameter for the dynamics of the structures, but seemingly not for their formation as such. The results can be of interest in the interpretation of structures in space plasmas as observed by instrumented spacecrafts.

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Section: Discussionmentioning

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Phase space structures generated by absorbing obstacles in streaming plasmas

Guio

Pécseli

2005

Ann. Geophys.

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“…Previous to these laboratory observations, electron holes had been launched and studied in detail in Q-machine plasmas [8][9][10] or in nonneutral plasmas [11], but no lab experiment had observed the self-consistent creation of electron holes from currentdriven turbulence. Electron holes have now also been observed and studied in detail in an experiment where turbulence was driven by an externally launched electron beam [12].…”

Section: Introductionmentioning

confidence: 99%

Observations of electron phase-space holes driven during magnetic reconnection in a laboratory plasma

et al. 2012

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This work presents detailed experimental observations of electron phase-space holes driven during magnetic reconnection events on the Versatile Toroidal Facility. The holes are observed to travel on the order of or faster than the electron thermal speed, and are of large size scale, with diameter of order 60 Debye lengths. In addition, they have 3-D spheroidal structure with approximately unity aspect ratio. We estimate the direct anomalous resistivity due to ion interaction with the holes and find it to be too small to affect the reconnection rate; however the holes may play a role in reining in a tail of accelerated electrons, and they indicate the presence of other processes in the reconnection layer, such as electron energization and electron beam formation.

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“…Saeki et al, 1979;Lynov et al, 1979;Guio et al, 2003) wherein electron dynamics is almost one-dimensional in nature since the external magnetic field "freezes" the transverse degrees of freedom of the electron fluid motion. The quasi-one-dimensional features of the particle dynamics justify the 1-D description of the electron holes (e.g.…”

Section: Introductionmentioning

confidence: 99%

On the three-dimensional configuration of electrostatic solitary waves

Krasovsky

Matsumoto

Omura

2004

Nonlin. Processes Geophys.

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Abstract. The simplest models of the electrostatic solitary waves observed by the Geotail spacecraft in the magnetosphere are developed proceeding from the concept of electron phase space holes. The technique to construct the models is based on an approximate quasi-one-dimensional description of the electron dynamics and three-dimensional analysis of the electrostatic structure of the localized wave perturbations. It is shown that the Vlasov-Poisson set of equations admits a wide diversity of model solutions of different geometry, including spatial configurations of the electrostatic potential similar to those revealed by Geotail and other spacecraft in space plasmas.

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Observations of Solitary Structures in a Magnetized, Plasma Loaded Waveguide

Abstract: Observations of solitary structures in a magnetized, plasma loaded waveguide.

Cited by 127 publications

References 17 publications

Phase space structures generated by absorbing obstacles in streaming plasmas

Phase space structures generated by absorbing obstacles in streaming plasmas

Observations of electron phase-space holes driven during magnetic reconnection in a laboratory plasma

On the three-dimensional configuration of electrostatic solitary waves

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