Arbitrary amplitude slow electron-acoustic solitons in three-electron temperature space plasmas

Mbuli, L. N.; Maharaj, S. K.; Bharuthram, R.; Singh, S. V.; Lakhina, G. S.

doi:10.1063/1.4922683

Cited by 17 publications

(13 citation statements)

References 55 publications

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“…3; however, the solitons shown for v dbw0 ¼ 0:8 in Fig. 4 are limited by the cool electron density (14) becoming unreal.…”

Section: Numerical Results and Discussionmentioning

confidence: 91%

“…1(a) for normalised cool electron density n ce0 ¼ 0:2 and warm electron density n we0 ¼ 0: In Region I, negative polarity solitons occur which are limited by the occurrence of double layers, which is illustrated in Fig. 2 14 for the cool and warm electron densities fixed at n ce0 ¼ 0:2 and n we0 ¼ 0:3. A different combination of n ce0 and n we0 would yield existence regions which differ from those shown in our Fig.…”

Section: Numerical Results and Discussionmentioning

confidence: 92%

“…The cool (warm) electrons provide the inertia, and the warm (hot) electrons provide the pressure in the propagation of the slow (fast) electron-acoustic modes. Detailed studies of arbitrary amplitude solitons associated with slow 14 and fast 15 electron-acoustic modes have been conducted in models in which the cool, warm, and hot electrons are treated as adiabatic species.…”

Section: Introductionmentioning

confidence: 99%

“…The occurrence of slow-mode electron-acoustic solitons having negative potentials 14 is limited in the order of increasing cool electron density by the cool and then the warm electron number densities becoming unreal and ultimately by the occurrence of double layers. A switch to positive potential solitons occurs at n ce0 ¼ 0:3, and the positive potential solitons are limited by the occurrence of double layers.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we investigate the effects of incorporating finite drift speed of the warm electrons on slow electron-acoustic nonlinear structures. The modeling of the three-temperature electrons as adiabatic fluids in this and earlier 14,15,[21][22][23] studies is based on the assumption that the thermal speeds of the cool, warm, and hot electrons are not widely separated. Although the more commonly used and popular assumption is that the hot electrons are Boltzmann distributed (i.e., the hot electrons are effectively massless), when attempting to interpret satellite observations, [1][2][3][4] for such models, electronacoustic type nonlinear structures do not yield positive 24 polarity solitons, which have been measured in the plasma sheet boundary layer, 1,2 magnetotail, 3 and midaltitude auroral 4 regions of the magnetosphere of Earth.…”

Section: Introductionmentioning

confidence: 99%

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The effect of a warm electron beam on slow electron-acoustic solitons

2018

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The effects of the inclusion of finite drift speed of a warm electron component on the existence of arbitrary amplitude slow electron-acoustic solitons are investigated in a model with ions and cool, warm, and hot electrons. All plasma species are treated as adiabatic fluids. For fixed densities of the cool, warm, and hot electrons, the admissible Mach number ranges of the supported negative potential solitons are found to widen with increasing warm electron beam speed, up to a maximum value of v dbwo ¼ 0.7. Beyond this maximum value, the soliton Mach number ranges become narrower and vanish completely at v dbwo ¼ 1.084 where a switch to positive polarity solitons occurs. For a fixed value of the drift speed of the warm electrons, the cool electron density value at which the switch to positive polarity soliton occurs is the lowest when there is no streaming of the warm electrons but increases with increasing drift speed.

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“…3; however, the solitons shown for v dbw0 ¼ 0:8 in Fig. 4 are limited by the cool electron density (14) becoming unreal.…”

Section: Numerical Results and Discussionmentioning

confidence: 91%

Section: Numerical Results and Discussionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The effect of a warm electron beam on slow electron-acoustic solitons

2018

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Negative Potential Solitary Structures in the Magnetosheath With Large Parallel Width

et al. 2018

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We report multispacecraft observations by the Magnetospheric MultiScale (MMS) mission of large (80–155 λDe parallel to B) electrostatic solitary waves (ESWs). Observations of the same ESWs at different positions and times enable unprecedented accuracy in determining the size, velocity, and evolution of these nonlinear structures. This particular event is a short series of negative potential solitary waves in the magnetosheath. The observed structures differ in amplitude and speed, merging or colliding with one another. A Vlasov simulation supports initial wave growth by a cold feature in the electron distribution function. Such cold electrons are likely the result of mixing between the cold magnetospheric and warm magnetosheath plasma along a reconnection separatrix. ESW speed and perpendicular size are inconsistent with ion phase space holes. Solving Poisson's equation for the measured potential, we find a reduction in electron density rather than an enhancement expected from an electron soliton. These ESWs have an unusual combination of properties on both ion and electron scales, likely supported by a complex electron distribution in the nonlinear state.

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