On the drift magnetosonic waves in anisotropic low beta plasmas

Naim, Hafsa; Bashir, M. F.; Murtaza, G.

doi:10.1063/1.4897370

Cited by 14 publications

(9 citation statements)

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“…The relevant components of the permittivity tensor are modified by taking into account the temperature anisotropy and the weak density inhomogeneity effects, which generates the DKAWs (Naim & Murtaza, ; Naim et al, ) as follows:

\begin{matrix} right ϵ_{y y} & left = 1 - \sum_{α} \frac{ω_{p α}^{2}}{ω^{2}} \sum_{n = - \infty}^{\infty} \frac{n^{2} {normalΓ}_{n} (b_{α})}{b_{α}} & right \\ right & left \times [\frac{ω_{α}^{*} - ω}{k_{false‖} v_{t ‖ α}} Z (ξ_{n α}) + (\frac{T_{⊥ α}}{T_{‖ α}} - 1) \frac{Z^{'} (ξ_{n α})}{2}], \end{matrix}

\begin{matrix} right ϵ_{z z} & left = 1 + \sum_{α} \frac{ω_{p α}^{2}}{ω^{2}} \frac{T_{‖ α}}{T_{⊥ α}} \sum_{n = - \infty}^{\infty} {normalΓ}_{n} (b_{α}) ξ_{0 α} ξ_{n α} Z^{'} (ξ_{n α}) & right \\ right & left \times [\frac{ω_{α}^{*}}{ω} - \frac{T_{⊥ α}}{T_{‖ α}} \{1 + (\frac{T_{⊥ α}}{T_{‖ α}} - 1)]\} \end{matrix}

…”

Section: Dkaws In Anisotropic Plasmamentioning

confidence: 99%

Theoretical Prediction of Asymmetric Instability of Drift Kinetic Alfven Waves in Anisotropic Plasmas

2019

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The asymmetric instability of drift kinetic Alfvén waves (DKAWs) is analyzed to study the interplay between the density inhomogeneity and the temperature anisotropy, including the wave-particle interaction and finite ion Larmor radius effects. The asymmetric behavior arises due to the opposite diamagnetic drifts of electrons and ions and quantifies the contribution of electron drift waves and ion drift waves in altering the dispersion characteristic of DKAWs. It is shown that the coupling of drift waves with kinetic Alfvén waves leads to the generation of three different frequency (i.e., higher, intermediate, and lower) modes of DKAWs. The comparison of their propagation characteristics and stability mechanisms applicable to a wide range of plasma parameters is provided. The analytical dispersion relation can be used as an improved theoretical tool for identifying the existence of DKAWs and their source region in the multisatellite observations, especially near the reconnection X-line.

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\begin{matrix} right ϵ_{y y} & left = 1 - \sum_{α} \frac{ω_{p α}^{2}}{ω^{2}} \sum_{n = - \infty}^{\infty} \frac{n^{2} {normalΓ}_{n} (b_{α})}{b_{α}} & right \\ right & left \times [\frac{ω_{α}^{*} - ω}{k_{false‖} v_{t ‖ α}} Z (ξ_{n α}) + (\frac{T_{⊥ α}}{T_{‖ α}} - 1) \frac{Z^{'} (ξ_{n α})}{2}], \end{matrix}

\begin{matrix} right ϵ_{z z} & left = 1 + \sum_{α} \frac{ω_{p α}^{2}}{ω^{2}} \frac{T_{‖ α}}{T_{⊥ α}} \sum_{n = - \infty}^{\infty} {normalΓ}_{n} (b_{α}) ξ_{0 α} ξ_{n α} Z^{'} (ξ_{n α}) & right \\ right & left \times [\frac{ω_{α}^{*}}{ω} - \frac{T_{⊥ α}}{T_{‖ α}} \{1 + (\frac{T_{⊥ α}}{T_{‖ α}} - 1)]\} \end{matrix}

…”

Section: Dkaws In Anisotropic Plasmamentioning

confidence: 99%

Theoretical Prediction of Asymmetric Instability of Drift Kinetic Alfven Waves in Anisotropic Plasmas

2019

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“…0 e 0 b p =  , in which the real wave vector k lies in the x-z plane. The dispersion relation in such a plasma can be written as [15,19,20,31,32]…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Following the same procedure adopted by the authors in references [15,19,20,31,32], we get a simplified expression for ò as For MS waves, as we know, the parallel wavenumber is small compared to the perpendicular wavenumber which means 1 0 z a  should be used in equation 4, in which case, the asymptotic form of the plasma dispersion function needs to be taken into account, i.e., [23,24] which means that the real frequency is independent of κ, in much the same way as the real frequency of electrostatic waves. This has to do with the structural similarities of the two dielectric tensors (equations (40) and (3) of references [24] and [33], respectively).…”

Section: |mentioning

confidence: 99%

Effect of kappa distribution on the damping rate of the obliquely propagating magnetosonic mode

Khan

Murtaza

2018

Plasma Sci. Technol.

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Data from spacecrafts suggest that space plasma has an abundance of suprathermal particles which are controlled by the spectral index κ when modeled on kappa particle velocity distribution. In this paper, considering homogeneous plasma, the effect of integer values of κ on the damping rate of an obliquely propagating magnetosonic (MS) wave is studied. The frequency of the MS wave is assumed to be less than ion cyclotron frequency, i.e., i w w . Under this assumption, the dispersion relation is investigated both numerically and analytically, and it is found that the real frequency of the wave is not a sensitive function of κ, but the imaginary part of the frequency is. It is also shown that for those values of κ where a large number of resonant particles participate in wave-particle interaction, the wave is heavily damped, as expected. The possible application of the results to the solar wind is discussed.

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“…Этот радар является аналогом радаров, используемых в международной сети SuperDARN (Super Dual Auroral Radar Network) Chisham et al, 2007]. Радаром регистрируется радиосигнал, рассеянный как на неровностях земной поверхности, так и на мелкомасштабных неоднородностях F-слоя ионосферы, вытянутых вдоль магнитного поля [Ruohoniemi et al, 1987]. Угол обзора радара, составляющий 50°, разделен на 16 секторов, или лучей (рис.…”

Section: оборудованиеunclassified

Observation of drift compressional waves with a mid-latitude decameter coherent radar

Челпанов¹,

Mager²,

Климушкин³

et al. 2016

Solnechno-Zemnaya Fizika

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Magnetospheric Pc5 pulsations observed on December 26, 2014 are analyzed. They were recorded in the nightside magnetosphere with a mid-latitude coherent decameter radar located near Ekaterinburg. It registers velocity variations in electric drift of ionospheric plasma caused by ULF waves in the magnetosphere. The westward direction of azimuthal propagation of wave coincides with the direction of magnetic drift of protons. A cross-wavelet analysis reveals that the frequency of oscillations depends on the wave number m, and the correlation between them is 0.90. The frequency increase from 2.5 to 5 mHz was followed by an increase in the absolute value m from 20 to 80. These features of the wave under study testify that it should be classified as a drift compressional mode which is typical for the ULF mode in kinetics. Existence conditions for it are the terminal pressure of plasma and its inhomogeneity across magnetic shells.

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On the drift magnetosonic waves in anisotropic low beta plasmas

Cited by 14 publications

References 50 publications

Theoretical Prediction of Asymmetric Instability of Drift Kinetic Alfven Waves in Anisotropic Plasmas

Theoretical Prediction of Asymmetric Instability of Drift Kinetic Alfven Waves in Anisotropic Plasmas

Effect of kappa distribution on the damping rate of the obliquely propagating magnetosonic mode

Observation of drift compressional waves with a mid-latitude decameter coherent radar

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