Adaptive Critical Balance and Firehose Instability in an Expanding, Turbulent, Collisionless Plasma

Bott, A. F. A.; Arzamasskiy, L.; Kunz, M. W.; Quataert, E.; Squire, J.

doi:10.3847/2041-8213/ac37c2

Title: Adaptive Critical Balance and Firehose Instability in an Expanding, Turbulent, Collisionless Plasma

Journal Article · Tue Nov 30 00:00:00 EST 2021 · The Astrophysical Journal. Letters

DOI:https://doi.org/10.3847/2041-8213/ac37c2· OSTI ID:1833754

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Using a hybrid-kinetic particle-in-cell simulation, we study the evolution of an expanding, collisionless, magnetized plasma in which strong Alfvénic turbulence is persistently driven. Temperature anisotropy generated adiabatically by the plasma expansion (and consequent decrease in the mean magnetic-field strength) gradually reduces the effective elasticity of the field lines, causing reductions in the linear frequency and residual energy of the Alfvénic fluctuations. In response, these fluctuations modify their interactions and spatial anisotropy to maintain a scale-by-scale “critical balance” between their characteristic linear and nonlinear frequencies. Eventually the plasma becomes unstable to kinetic firehose instabilities, which excite rapidly growing magnetic fluctuations at ion-Larmor scales. The consequent pitch-angle scattering of particles maintains the temperature anisotropy near marginal stability, even as the turbulent plasma continues to expand. The resulting evolution of parallel and perpendicular temperatures does not satisfy double-adiabatic conservation laws, but is described accurately by a simple model that includes anomalous scattering. Our results have implications for understanding the complex interplay between macro- and microscale physics in various hot, dilute, astrophysical plasmas, and offer predictions concerning power spectra, residual energy, ion-Larmor-scale spectral breaks, and non-Maxwellian features in ion distribution functions that may be tested by measurements taken in high-beta regions of the solar wind.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); University of California, Berkeley, CA (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF); Royal Society of New Zealand; University of Texas; Marsden Fund

Grant/Contract Number:: SC0019046; SC0019047; UOO1727; OCI-1053575

OSTI ID:: 1833754

Alternate ID(s):: OSTI ID: 1888521; OSTI ID: 1984385

Journal Information:: The Astrophysical Journal. Letters, Journal Name: The Astrophysical Journal. Letters Vol. 922 Journal Issue: 2; ISSN 2041-8205

Publisher:: American Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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