Nonlinear electrostatic ion-acoustic &amp;quot;oscilliton&amp;quot; waves driven by charge non-neutrality effects

G., J. Z.; Hirose, Akira; St.-Maurice, J.-P.; Liu, W.

doi:10.5194/angeo-29-123-2011

Cited by 4 publications

(1 citation statement)

References 115 publications

(121 reference statements)

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“…Furthermore, the relevance of the LH solitary structures in explaining small-scale density depletions observed by rocket and satellite experiments has been discussed. Finally, Ma et al (2011) have investigated the charge non-neutrality effects on the excitation of electrostatic ion-acoustic oscillitons.…”

Section: K Sauer and R D Sydora: Whistler-langmuir Oscillitons Andmentioning

confidence: 99%

Whistler-Langmuir oscillitons and their relation to auroral hiss

Sauer

Sydora

2011

Ann. Geophys.

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Abstract.A new type of oscilliton (soliton with superimposed spatial oscillations) is described which arises in plasmas if the electron cyclotron frequency e is larger than the electron plasma frequency ω e , which is a typical situation for auroral regions in planetary magnetospheres. Both highfrequency modes of concern, the Langmuir and the whistler wave, are completely decoupled if they propagate parallel to the magnetic field. However, for oblique propagation two mixed modes are created with longitudinal and transverse electric field components. The lower mode (in the literature commonly called the whistler mode, e.g. Gurnett et al., 1983) has whistler wave characteristics at small wave numbers and asymptotically transforms into the Langmuir mode. As a consequence of the coupling between these two modes, with different phase velocity dependence, a maximum in phase velocity appears at finite wave number. The occurrence of such a particular point where phase and group velocity coincide creates the condition for the existence of a new type of oscillating nonlinear stationary structure, which we call the whistler-Langmuir (WL) oscilliton. After determining, by means of stationary dispersion theory, the parameter regime in which WL oscillitons exist, their spatial profiles are calculated within the framework of cold (non-relativistic) fluid theory. Particle-in-cell (PIC) simulations are used to demonstrate the formation of WL oscillitons which seem to play an important role in understanding electron beam-excited plasma radiation that is observed as auroral hiss in planetary magnetospheres far away from the source region.

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Section: K Sauer and R D Sydora: Whistler-langmuir Oscillitons Andmentioning

confidence: 99%

Whistler-Langmuir oscillitons and their relation to auroral hiss

Sauer

Sydora

2011

Ann. Geophys.

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Dissipative ion-cyclotron oscillitons in a form of solitons with chirp in Earth's low-altitude ionosphere

Kovaleva

2012

Physics of Plasmas

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In this paper, we consider theoretically nonlinear ion-cyclotron gradient-drift dissipative structures (oscillitons) in low ionospheric plasmas. Similar to Nonlinear Optics and Condensed Matter Physics, the Ginzburg-Landau equation for the envelope of electric wave fields is derived, and solutions for oscillitons in the form of solitons with chirp are examined. The whole dissipative structure constitutes a soliton with a moving charge-neutral density hump. Conditions for excitation and properties of the structures are considered.

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Nonlinear saturation of the ion-electron Buneman instability in a spherical positively pulsed gridded inertial electrostatic confinement device

Bandara

Khachan

2015

Physics of Plasmas

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A pulsed, positively biased gridded inertial electrostatic confinement device has been investigated experimentally, using Doppler broadened spectra and current and voltage traces as primary diagnostics. In the high current and energy regime explored in this paper resulting from the removal of the series ballast resistance from the external biasing circuit, large amplitude oscillations in the plasma current and potential were observed within 100 ns of the discharge onset. These oscillations are attributed to the nonlinear and saturated Buneman instability, characterised by a locked oscillation frequency as a function of increasing anode potential. The saturated Buneman instability is known to exhibit ion mass independent behaviour and cause electron trapping, resulting in a transient spatio-temporal virtual cathode and ponderomotive ion confinement, as evidenced by broadened spectra when operated at high currents.

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Nonlinear electrostatic ion-acoustic "oscilliton" waves driven by charge non-neutrality effects

Cited by 4 publications

References 115 publications

Whistler-Langmuir oscillitons and their relation to auroral hiss

Whistler-Langmuir oscillitons and their relation to auroral hiss

Dissipative ion-cyclotron oscillitons in a form of solitons with chirp in Earth's low-altitude ionosphere

Nonlinear saturation of the ion-electron Buneman instability in a spherical positively pulsed gridded inertial electrostatic confinement device

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