Shear flow-driven electrostatic instabilities in low density and low temperature pair-ion plasmas with and without electrons

Saleem, H.; Batool, Nazia; Poedts, Stefaan

doi:10.1063/1.3589474

Cited by 5 publications

(3 citation statements)

References 19 publications

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“…[1] are not definite. [12][13][14][15] They have pointed out [16][17][18] that the fullerene PI plasma produced in laboratory contains small concentration of electrons as well, and it is necessary to develop some abilities to estimate the electron concentration in PI plasma. However, the authors of ref.…”

Section: Introductionmentioning

confidence: 99%

A study of ions' shear flow instabilities and parallel electron current in pure pair‐ion and pair‐ion‐electron plasmas

Shahzad

Rehman

2022

Contributions to Plasma Physics

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The pair-ion plasma has attained special attention due to equal masses and equal but opposite charges. The electrostatic fluctuations with sheared effect are investigated in ideal low-density and low-temperature pure pair-ion (PI) and pair-ion electron (PIE) plasmas in different cases. These instabilities are also studied with homogeneous and inhomogeneous density effects. The growing D'Angelo mode can become the electrostatic instability with shear flow in uniform PIE plasma. It is observed that the shear flow also gives rise to an electrostatic instability in temperature anisotropic pure pair-ion plasma. It is also seen that in pair-ion plasma, the presence of small concentration of electrons results in significant changings in real frequency and growth rate of ion acoustic waves (IAWs). The effect of current driven field aligned flow of electrons on IAWs is also discussed in this article. Kinetic and fluid models are used to study the growth rate of IAWs when both the ionic species have similar shear flow and when both the ionic species have different shear flow.

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Section: Introductionmentioning

confidence: 99%

A study of ions' shear flow instabilities and parallel electron current in pure pair‐ion and pair‐ion‐electron plasmas

Shahzad

Rehman

2022

Contributions to Plasma Physics

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“…After the pioneering experimental studies on propagation properties of electrostatic waves in symmetric pair-ion plasmas [1][2][3][4][5] (singly charged positive and negative fullerene ions), there have appeared a number of theoretical works on various linear and nonlinear modes in pair-ion plasmas [6][7][8][9][10][11][12][13][14][15][16][17]. However, basic propagation characteristics observed in the experiments have not been adequately explained yet.…”

mentioning

confidence: 99%

“…The solution, Eq. (16), is depicted by the purple curves in Fig. 1: the solutions with þ and − signs are backward and forward, respectively.…”

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confidence: 99%

Electrostatic Ion Cyclotron and Ion Plasma Waves in a Symmetric Pair-Ion Plasma Cylinder

2014

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Complicated wave behavior observed in the cylindrical pair-ion (fullerene) experiments by Oohara and co-workers are now identified to be low harmonic ion cyclotron waves combined with ion plasma oscillations inherent to kinetic theory. The electrostatic dispersion equation derived is based on an approximation for the current from the exact solutions of the characteristic cylindrical geometry form of the Vlasov plasma equation in a uniform magnetized plasma cylinder surrounded by a larger metal boundary outside a vacuum gap, which thus differs from that in unbounded plasmas. Positive and negative ions, differing only in the sign of their charge, respond to a potential in the same time scale and cooperate to reflect the enhanced kinetic orbital behaviors to the macroscopic propagation characteristics. In addition, the experimental value of the Larmor radius (comparable to the discharge radius but small enough to make the analytic approximation useful) makes higher harmonic ion cyclotron effects both observable and calculable with the appropriate approximation for the kinetic theory.

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Shear‐modified ion‐acoustic instability in ionospheric multi‐ion plasmas

Shahzad,

Aman‐ur‐Rehman,

Ali

et al. 2024

Contrib. Plasma Phys

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The linear properties of the low‐frequency ion‐acoustic (IA) waves are studied in a collisionless magnetoplasma using both fluid and kinetic descriptions in the presence of particle shear flows and field‐aligned currents. Two different compositions of plasmas such as and are analyzed under the drift approximation and plan wave solution. Calculating a generalized linear dispersion function, shear‐modified IA waves are investigated with various limiting cases. In contrast, relying on the kinetic treatment, a generalized dielectric response function is also solved to study the real frequency and growth rate of the shear‐modified IA waves. Numerically, it is shown that a small concentration of negative hydrogen ions in the oxygen ionospheric plasma may lead to an increase in the growth rate and real frequency of the IA waves. The growth rate of negative hydrogen ion plasma is relatively found larger than that of positive hydrogen ion plasma. It is also noted that growth rate increases significantly with field‐aligned flow of lighter species as compared with heavier ones. The magnitudes of the wave frequency and growth rate become larger when plasma species stream in the same direction as compared with counter‐streaming of plasma species. Additionally, the shear flow modifies the profiles of wave instability and IA oscillations are greatly influenced by the same and opposite sides' particle shear flows. The growth rate increases as the shear flow increases, resulting in wider curves. The present findings are important for understanding the low‐frequency electrostatic excitations in upper ionospheric plasma, where particle shear flows are common.

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Shear flow-driven electrostatic instabilities in low density and low temperature pair-ion plasmas with and without electrons

Cited by 5 publications

References 19 publications

A study of ions' shear flow instabilities and parallel electron current in pure pair‐ion and pair‐ion‐electron plasmas

A study of ions' shear flow instabilities and parallel electron current in pure pair‐ion and pair‐ion‐electron plasmas

Electrostatic Ion Cyclotron and Ion Plasma Waves in a Symmetric Pair-Ion Plasma Cylinder

Shear‐modified ion‐acoustic instability in ionospheric multi‐ion plasmas

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