Turbulent heating and anomalous k spectrum in the quasilinear evolution of current-driven ion-acoustic instability in a magnetic field

1984 ◽  
Vol 27 (2) ◽  
pp. 364 ◽  
Author(s):  
O. Ishihara ◽  
A. Hirose
Keyword(s):  
Magnetic Field ◽  
Acoustic Instability ◽  
Ion Acoustic ◽  
Turbulent Heating

An assessment of how a combination of shears, field-aligned currents and collisions affect F-region ionospheric instabilities

2007 ◽  
Vol 73 (1) ◽  
pp. 69-88 ◽  
Author(s):  
J.-P. ST.-MAURICE ◽  
J.-M. NOËL ◽  
P. J. PERRON
Keyword(s):  
Magnetic Field ◽  
Low Frequency ◽  
Theoretical Framework ◽  
Fluid Limit ◽  
Ambient Magnetic Field ◽  
Acoustic Instability ◽  
F Region ◽  
Ion Acoustic ◽  
Depth Study ◽  
Zero Frequency

Abstract.We present an in depth study of the fluid limit of a kinetically derived collisional, current-driven instability that includes shears in the field-aligned currents as well as collisions. We show how the theory presented here generalizes other theories, including the collisionless current-driven electrostatic ion acoustic instability and its sheared collisionless version. We offer a low-frequency generalization of the zero frequency ion shear driven instability by minimizing the relative drift magnitude as well as the shears themselves. We discuss the implication of our theoretical framework both for strongly field-aligned modes and modes where the wavevectors have arbitrary angles with respect to the ambient magnetic field. We discuss the results in terms of F-region irregularity observations of coherent echoes by ionospheric radars.

Cross-Field Ion-Acoustic Instability Observed in a Turbulent-Heating Experiment

1972 ◽  
Vol 28 (5) ◽  
pp. 270-273 ◽  
Author(s):  
A. Hirose ◽  
K. E. Lonngren ◽  
H. M. Skarsgard
Keyword(s):  
Acoustic Instability ◽  
Ion Acoustic ◽  
Turbulent Heating

Low-frequency instabilities of a warm plasma in a magnetic field: Part 1. Instabilities driven by field-aligned currents

1977 ◽  
Vol 17 (1) ◽  
pp. 105-122 ◽  
Author(s):  
Dean F. Smith ◽  
Joseph V. Hollweg
Keyword(s):  
Magnetic Field ◽  
Stability Analysis ◽  
Low Frequency ◽  
Marginal Stability ◽  
Numerical Techniques ◽  
Acoustic Instability ◽  
Ion Acoustic ◽  
Warm Plasma ◽  
The Stability ◽  
Thermal Speed

The marginal stability of a plasma carrying current along the static magnetic field with isotropic Maxwellian ions and isotropic Maxwellian electrons drifting relative to the ions is investigated. The complete electromagnetic dispersion relation is studied using numerical techniques; the electron sums are restricted to three terms which limits the analysis to frequencies much less than the electron gyro-frequency, but includes frequencies somewhat above the ion gyro-frequency. A ‘kink-like’ instability and an instability of the Alfvén mode are found to have the lowest threshold drift velocities in most cases. In fact the threshold drift for the kink-like instability can be significantly less than the ion thermal speed. Electrostatic and electromagnetic ion-cyclotron instabilities are also found as well as the electro-static ion-acoustic instability. No instability of the fast magnetosonic mode was found. The stability analysis provides only threshold drift velocities and gives no information about growth rates.

The effect of magnetic shear on the crossfield current-driven ion-acoustic instability

1982 ◽  
Vol 28 (2) ◽  
pp. 255-266
Author(s):  
R. Bharuthram ◽  
M. A. Hellberg
Keyword(s):  
Magnetic Field ◽  
Density Gradient ◽  
Landau Damping ◽  
Magnetic Shear ◽  
Acoustic Instability ◽  
Ion Acoustic ◽  
Damping Rate ◽  
Shear Damping

The behaviour of the crossfield current-driven ion-acoustic instability in the presence of a sheared magnetic field and a density gradient is investigated theoretically in the limit in which growth due to inverse Landau damping is small. The shear damping rate is found and the critical shear length shown to vary as (mi/me)⅓ and as ((VD–CS)/CS)–⅔.

scholarly journals Particle simulation of auroral double layers

1987 ◽  
Vol 5 (2) ◽  
pp. 367-380
Author(s):  
Bruce L. Smith ◽  
Hideo Okuda
Keyword(s):  
Magnetic Field ◽  
Particle Simulation ◽  
Double Layers ◽  
Early Model ◽  
Cell Models ◽  
Particle In Cell ◽  
Acoustic Instability ◽  
Dipole Magnetic Field ◽  
Self Consistent ◽  
Ion Acoustic

We report on our work to simulate auroral double layers (DL's) with ‘realistic’ particle-in-cell models. An early model simulated weak DL's formed in a self-consistent circuit but under conditions subject to the ion-acoustic instability. More recent work has focused on strong DL's formed when currentless jets are injected into a dipole magnetic field.

Dynamics of nonlinear ion-acoustic waves in an external magnetic field

1985 ◽  
Vol 44 (8) ◽  
pp. 537-543 ◽  
Author(s):  
E. Infeld ◽  
P. Frycz ◽  
T. Czerwiśka-Lenkowska
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Acoustic Waves ◽  
Ion Acoustic Waves ◽  
Ion Acoustic

A linear and quasi-linear investigation of the crossfield current-driven ion-acoustic instability

1982 ◽  
Vol 28 (2) ◽  
pp. 267-279 ◽  
Author(s):  
R. Bharuthram ◽  
M. A. Hellberg
Keyword(s):  
Linear Growth ◽  
Velocity Distribution Function ◽  
Linear Growth Rate ◽  
Particle Diffusion ◽  
Anomalous Resistivity ◽  
Heating Rates ◽  
Ion Heating ◽  
Acoustic Instability ◽  
Ion Acoustic ◽  
Drift Instability

The linear growth rate of the crossfield current-driven ion-acoustic instability is obtained for any equilibrium particle velocity distribution function of the type . Quasi-linear theory is then used to investigate the saturation of the instability. Several associated features, namely, particle diffusion in velocity space, anomalous resistivity, energy distribution and electron and ion heating rates are evaluated for a Maxwellian distribution. Finally, a brief comparison is made with the heating rates associated with the electron cyclotron drift instability.

scholarly journals Brief Communication: The double layer in the separatrix region during magnetic reconnection

2015 ◽  
Vol 22 (2) ◽  
pp. 167-171
Author(s):  
J. Guo ◽  
B. Yu
Keyword(s):  
Electron Beam ◽  
Magnetic Reconnection ◽  
Double Layer ◽  
Particle In Cell ◽  
Acoustic Instability ◽  
Ion Acoustic ◽  
Evolution Stage ◽  
Spatial Size ◽  
Electron Holes ◽  
Observation Results

Abstract. With two-dimensional (2-D) particle-in-cell (PIC) simulations we investigate the evolution of the double layer (DL) driven by magnetic reconnection. Our results show that an electron beam can be generated in the separatrix region as magnetic reconnection proceeds. This electron beam could trigger the ion-acoustic instability; as a result, a DL accompanied with electron holes (EHs) can be found during the nonlinear evolution stage of this instability. The spatial size of the DL is about 10 Debye lengths. This DL propagates along the magnetic field at a velocity of about the ion-acoustic speed, which is consistent with the observation results.

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