Abstract
The weak collisionality typical of turbulence in many diffuse astrophysical plasmas invalidates an MHD description of the turbulent dynamics, motivating the development of a more comprehensive theory of kinetic turbulence. In particular, a kinetic approach is essential for the investigation of the physical mechanisms responsible for the dissipation of astrophysical turbulence and the resulting heating of the plasma. This chapter reviews the limitations of MHD turbulence theory and explains how kinetic considerations may be incorporated to obtain a kinetic theory for astrophysical plasma turbulence. Key questions about the nature of kinetic turbulence that drive current research efforts are identified. A comprehensive model of the kinetic turbulent cascade is presented, with a detailed discussion of each component of the model and a review of supporting and conflicting theoretical, numerical, and observational evidence.
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Notes
- 1.
Here T s is expressed in units of energy, absorbing the Boltzmann constant.
- 2.
Note that condition (4) is not generally independent of condition (3). For MHD Alfvén waves, the condition \(\omega \ll \varOmega _{i}\) may be alternatively written \(\rho _{i}/l_{\parallel }\ll \sqrt{\beta _{i}}\), where the ion plasma beta is \(\beta _{i} = 8\pi n_{i}T_{i}/B^{2}\). Thus, if \(\sqrt{\beta _{i}} \sim \mathcal{O}(1)\), then condition (4) is roughly equivalent to condition (3).
- 3.
The Lorentz force limits the perpendicular motion of plasma particles to the particle Larmor radius. Since typical astrophysical conditions yield \(\rho _{i} \ll \lambda _{i}\), the plasma is essentially always collisionless in the perpendicular direction. Note, however, that because plasma particles cannot move beyond the Larmor radius in the perpendicular direction from the magnetic field, this embodies the large-scale perpendicular motions, \(l_{\perp }\gg \rho _{i}\), with a fluid-like behavior, even under weakly collisional conditions.
- 4.
In the limit that the turbulent astrophysical fluctuations satisfy the gyrokinetic approximation, \(k_{\parallel }\ll k_{\perp }\) and ω ≪ Ω i (Frieman and Chen 1982; Howes et al. 2006; Schekochihin et al. 2009), the linear physics depends on only three dimensionless parameters, \(\overline{\omega }_{\text{GK}} =\omega /(k_{\parallel }v_{A}) = \overline{\omega }_{\text{GK}}(k_{\perp }\rho _{i},\beta _{i},T_{i}/T_{e})\) (Howes et al. 2006).
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Acknowledgements
I would like to thank Steve Cowley, Bill Dorland, and Eliot Quataert for their invaluable guidance, steering my career toward the study of turbulence in kinetic astrophysical plasmas. Alex Schekochihin, Tomo Tatsuno, Ryusuke Numata, and Jason TenBarge have contributed tremendously to my efforts to understand kinetic turbulence. Financial support has been provided by NSF grant PHY-10033446, NSF CAREER Award AGS-1054061, and NASA grant NNX10AC91G.
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Howes, G.G. (2015). Kinetic Turbulence. In: Lazarian, A., de Gouveia Dal Pino, E., Melioli, C. (eds) Magnetic Fields in Diffuse Media. Astrophysics and Space Science Library, vol 407. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-44625-6_6
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