A generalized dispersion relation of obliquely propagating drift magnetosonic waves is derived by using the gyrokinetic theory for anisotropic low beta plasmas. The stability analysis applicable to a wide range of plasma parameters is performed to understand the stabilization mechanism of the drift magnetosonic instability and the estimation of the growth rate is also presented. It is noted that the growth rate of the drift instability enhances for small anisotropy (Ae,i = T⊥e,i/T∥e,i < 1) whereas it is suppressed for large anisotropy (Ae,i > 1).
By using the gyrokinetic theory, the kinetic Alfvén waves (KAWs) are discussed to emphasize the drift effects through the density inhomogeneity and the temperature anisotropy on their dispersion characteristics. The dependence of stabilization mechanism of the drift-Alfvén wave instability on the temperature anisotropy is highlighted. The estimate of the growth rate and the threshold condition for a wide range of parameters are also discussed.
Dust particles that are ubiquitously present in space interact with the space plasma and can modify the existing modes and affect the growth rate of instability. In this work, the effects of homogeneous dust on the obliquely propagating anisotropic, low beta drift magnetosonic wave, and its related kinetic instability are analyzed using the gyrokinetic model. A comparison is made of different effects due to the dust density, the ions and electrons density inhomogeneity, and the temperature anisotropy. It is observed that both the temperature anisotropy and the presence of dust species augment each other in suppressing the growth of the drift instability. Our results may, therefore, be useful in studying the propagation characteristics of drift magnetosonic wave in space near the Sun where the environment is anisotropic, and the dust species also exist.
Waves and instabilities have very often been an object of fascination since the introduction of non-Maxwellian features in space plasmas. To date, the dispersion relation, including real frequency, damping, and growth rates of magnetosonic waves has been studied in many different types of non-Maxwellian distributions. However, these characteristics have been overlooked in the temperature bi-anisotropic Cairns distribution, characterized by the free parameter Λ. By employing the linearized Vlasov–Maxwell system in homogeneous plasma, the dispersion relation is analytically solved. It is found that the non-Maxwellian features, Λ ≠ 0 along with electron temperature anisotropy, notably modify the real frequency, damping, and growth rates—both in the hydrodynamic as well as in the kinetic regimes. Interestingly, the growth rate in the kinetic regime is entirely due to the correlation of Λ with the electron temperature anisotropy which is otherwise absent in the Maxwellian distribution. Due to their relevance, the results are applicable to solar wind plasma.
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