Evolution of electron phase‐space holes in 3D

Oppenheim, M. M.; Vetoulis, G.; Newman, D. L.; Goldman, M. V.

doi:10.1029/2000gl012383

Cited by 82 publications

(104 citation statements)

References 21 publications

(27 reference statements)

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“…It is interesting to also note that Singh et al (2001) observed radiation of small amplitude waves when phase space vortices underwent rapid changes (in their case electron holes radiating plasma waves). Related observations were made by Newman et al (2001) and Oppenheim et al (2001).…”

Section: Numerical Resultsmentioning

confidence: 70%

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: Numerical Resultsmentioning

confidence: 70%

Phase space structures generated by absorbing obstacles in streaming plasmas

Guio

Pécseli

2005

Ann. Geophys.

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“…Berk et al, 1970;Schamel, 1979;Dupree, 1982;Omura et al, 1994;Krasovsky et al, 1997;Goldman et al, 1999;Krasovsky et al, 1999a;Franz et al, 2000;Oppenheim et al, 2001). Although the solitary waves recorded by Geotail look like almost plane perturbations or one-dimensional solitons, the solitary potential structures observed by the FAST and POLAR satellites resemble perturbations of an ellipsoidal, sometimes almost spherical shape (Ergun et al, 1998;Franz et al, 1998).…”

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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“…To be an important radiation source via the electron-cyclotron maser mechanism, EHs should produce steep positive velocity space gradients on the electron distribution function both in the perpendicular and parallel directions (Treumann et al, 2011). It is important to mention that, thus far, perpendicular velocity space data are unfortunately not represented in numerical magnetized simulations (Oppenheim et al, 2001).…”

Section: Electron Holes As Radiating Antennasmentioning

confidence: 99%

Radiation in the neighbourhood of a double layer

Pottelette¹,

Berthomier²,

Pickett

2014

Ann. Geophys.

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Abstract. In the auroral kilometric radiation (AKR) source region, acceleration layers narrow in altitude and associated with parallel field-aligned potential drops of several kV can be identified by using both particles and wave-field high time-resolution measurements from the Fast Auroral SnapshoT explorer spacecraft (FAST). These so-called double layers (DLs) are recorded around density enhancements in the auroral cavity, where the enhancement can be at the edge of the cavity or even within the cavity at a small scale. Once immersed in the plasma, DLs necessarily accelerate particles along the magnetic field lines, thereby generating locally strong turbulent processes leading to the formation of nonlinear phase space holes. The FAST data reveal the asymmetric character of the turbulence: the regions located on the highpotential side of the DLs are characterized by the presence of electron holes, while on the low-potential side, ion holes are recorded. The existence of these nonlinear phase space holes may affect the AKR radiation pattern in the neighbourhood of a DL where the electron distribution function is drastically different from a horseshoe shape. We present some observations which illustrate the systematic generation of elementary radiation events occurring significantly above the local electron gyrofrequency in the presence of electron holes. These fine-scale AKR radiators are associated with a local electron distribution which presents a pronounced beam-like shape.

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Evolution of electron phase‐space holes in 3D

Cited by 82 publications

References 21 publications

Phase space structures generated by absorbing obstacles in streaming plasmas

Phase space structures generated by absorbing obstacles in streaming plasmas

On the three-dimensional configuration of electrostatic solitary waves

Radiation in the neighbourhood of a double layer

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