A comparative study of ion beam and velocity shear driven resonant instability of kinetic Alfvén waves with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si62.svg"><mml:mrow><mml:mi>κ</mml:mi></mml:mrow></mml:math>-electrons

Barik, K.C.; Singh, S.V.; Lakhina, G.S.

doi:10.1016/j.asr.2024.03.034

Cited by 1 publication

(2 citation statements)

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“…These nonthermal characteristics, usually deviating from Maxwellian, are often observed in nonmonotonic velocity distributions, an abundance of suprathermal particles, and highenergy tails, particularly in space plasmas such as the solar wind. To effectively model these deviations from the Maxwellian distribution, various non-Maxwellian distributions have been proposed (Cairns et al 1995;Pierrard & Lazar 2010;Liu et al 2014;Rubab et al 2014;Zank 2017;Barik et al 2020Barik et al , 2024. Among these distributions, the Cairns distribution (Cairns et al 1995) offers a straightforward analytical choice.…”

Section: Introductionmentioning

confidence: 99%

“…It is found that the Poynting flux vector of KAWs decays at a faster rate as the values of the index κ increase. In recent studies by Barik et al (2020Barik et al ( , 2024, KAWs have also been investigated using the κ distribution together with Maxwellian. Intriguingly, these works reveal that the excitation of waves solely by velocity shear leads to the emergence of purely growing KAWs within the auroral region of Earth's magnetosphere.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Solar Coronal Heating by Kinetic Alfvén Waves

Ayaz,

Li,

Khan

2024

ApJ

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The utilization of the Cairns distribution serves as a vital tool for characterizing the nonthermal attributes commonly observed in space plasmas. In these intricate plasma environments, extensive measurements have been conducted to monitor the fluctuations inherent in the perturbed electromagnetic (EM) field and the associated Poynting flux, specifically concerning kinetic Alfvén waves (KAWs). Traditionally, these fluctuations have been attributed to gyroradius correction terms within the framework of Maxwellian distributed plasmas. However, our study introduces an innovative perspective grounded in kinetic theory coupled with the Cairns distribution, adept at encapsulating the nonthermal nuances characterized by the index parameter Λ. Within the domain of the solar corona, our investigation centers on the perturbed EM field ratios and the Poynting flux of KAWs, with a foundation in the Cairns distribution function. It is noteworthy that the perpendicular components, although deemed less significant due to the dominance of k ⊥ over k ∥, remain unquantified regarding their relative insignificance. Similarly, the exploration of the imaginary part of the normalized EM field ratio has been a relatively understudied domain. Furthermore, we delve into the nuanced assessment of the power rate I x /I z characterizing the perpendicular and parallel normalized Poynting fluxes (S x and S z ). Intriguingly, we discern that large values of Λ, compared to their Maxwellian counterparts, manifest advantageous attributes, particularly concerning the energization of the plasma over extended distances along the ambient magnetic field lines. The analytical insights gleaned from this study find practical application in understanding phenomena within the solar atmosphere, particularly shedding light on the significant role played by nonthermal particles in the observed heating processes.

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