Ultra slow electron holes in collisionless plasmas: Stability at high ion temperature

@article{Mandal2020UltraSE,
  title={Ultra slow electron holes in collisionless plasmas: Stability at high ion temperature},
  author={Debraj Mandal and Devendra Sharma and Hans Schamel},
  journal={Physics of Plasmas},
  year={2020}
}
Numerical simulations recover ultraslow solitary electron holes (SEH) of electron-acoustic genre propagating stably well below the ion acoustic speed Cs, where no pure electron perturbation is known to exist yet, as they are disallowed by the ion response. Recovered at high ion temperature (Ti > Te), the reason for this stability (unaccelerated propagation, unseen before in existing literature) of SEH is traced to the loss of neutralizing cold ion response. In the opposite case of a background… 

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References

SHOWING 1-10 OF 59 REFERENCES
Anomalous resistivity and the nonlinear evolution of the ion‐acoustic instability
[1] Collisionless magnetic reconnection requires the violation of ideal MHD by various kinetic-scale effects whose relative importance is uncertain. Recent research has highlighted the potential
Cnoidal electron hole propagation: Trapping, the forgotten nonlinearity in plasma and fluid dynamics
In this review a plaidoyer is held for a specific form of nonlinearity, the trapping nonlinearity (TN), which arises due to a capture of particles and/or fluid elements in an excited coherent
Persistent subplasma-frequency kinetic electrostatic electron nonlinear waves
Driving a one-dimensional collisionless Maxwellian (Vlasov) plasma with a sufficiently strong longitudinal ponderomotive driver for a sufficiently long time results in a self-sustaining nonsinusoidal
Study of trapped particle nonlinearity in Ion Acoustic solitary wave using Vlasov simulation
Collective processes in a system of many interacting particles like plasma involves solving the kinetic Vlasov equation in a multiple species phase-space. One of the challenges in simulation of
Plasma electron hole kinematics. II. Hole tracking Particle-In-Cell simulation
The kinematics of a 1-D electron hole is studied using a novel Particle-In-Cell simulation code. A hole tracking technique enables us to follow the trajectory of a fast-moving solitary hole and study
Adiabatic electron response and solitary wave generation by trapped particle nonlinearity in a hydrogen plasma
The finite amplitude ion acoustic waves that trap electrons modify the structure of the evolving nonlinear soliton solutions. In the numerical simulations, self-consistently generated solitary waves
Dynamics of electron holes in an electron-oxygen-ion plasma.
The dynamics of electron holes (EHs) in an electron-oxygen-ion plasma is studied by means of Vlasov simulations. It is found that EHs are attracted by ion density maxima but repelled by ion density
Subcritical growth of electron phase-space holes in planetary radiation belts
The discovery of long-lived electrostatic coherent structures with large-amplitude electric fields ($1 \leq E \leq 500 $ mV/m) by the Van Allen Probes has revealed alternative routes through which
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