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Found 5 entries in the Bibliography.
Showing entries from 1 through 5
On the violation of the zeroth law of turbulence in space plasmas
The zeroth law of turbulence states that, for fixed energy input into large-scale motions, the statistical steady state of a turbulent system is independent of microphysical dissipation properties. This behaviour, which is fundamental to nearly all fluid-like systems from industrial processes to galaxies, occurs because nonlinear processes generate smaller and smaller scales in the flow, until the dissipation - no matter how small - can thermalise the energy input. Using direct numerical simulations and theoretical arguments ...
Meyrand, R.; Squire, J.; Schekochihin, A.; Dorland, W.;
Published by: Journal of Plasma Physics Published on: 05/2021
YEAR: 2021   DOI: 10.1017/S0022377821000489
space plasma physics; astrophysical plasmas; plasma nonlinear phenomena; Physics - Space Physics; Astrophysics - Solar and Stellar Astrophysics; Nonlinear Sciences - Chaotic Dynamics; Physics - Plasma Physics; Parker Data Used
How Alfvén waves energize the solar wind: heat versus work
A growing body of evidence suggests that the solar wind is powered to a large extent by an Alfvén-wave (AW) energy flux. AWs energize the solar wind via two mechanisms: heating and work. We use high-resolution direct numerical simulations of reflection-driven AW turbulence (RDAWT) in a fast-solar-wind stream emanating from a coronal hole to investigate both mechanisms. In particular, we compute the fraction of the AW power at the coronal base ($P_\textrm AWb$) that is transferred to solar-wind particles via heating between ...
Perez, Jean; Chandran, Benjamin; Klein, Kristopher; Martinovic, Mihailo;
Published by: Journal of Plasma Physics Published on: 04/2021
YEAR: 2021   DOI: 10.1017/S0022377821000167
Parker Data Used; astrophysical plasmas; space plasma physics; plasma nonlinear phenomena; Astrophysics - Solar and Stellar Astrophysics; Physics - Plasma Physics; Physics - Space Physics
Reflection-driven magnetohydrodynamic turbulence in the solar atmosphere and solar wind
Chandran, Benjamin; Perez, Jean;
Published by: Journal of Plasma Physics Published on: 08/2019
YEAR: 2019   DOI: 10.1017/S0022377819000540
Parker Data Used; astrophysical plasmas; plasma nonlinear phenomena; space plasma physics; Physics - Space Physics; Astrophysics - Solar and Stellar Astrophysics; Physics - Plasma Physics
Parametric instability, inverse cascade and the range of solar-wind turbulence
In this paper, weak-turbulence theory is used to investigate the nonlinear evolution of the parametric instability in three-dimensional low-β plasmas at wavelengths much greater than the ion inertial length under the assumption that slow magnetosonic waves are strongly damped. It is shown analytically that the parametric instability leads to an inverse cascade of Alfv\ en wave quanta, and several exact solutions to the wave kinetic equations are presented. The main results of the paper concern the parametric decay of Alf ...
Published by: Journal of Plasma Physics Published on: 02/2018
YEAR: 2018   DOI: 10.1017/S0022377818000016
astrophysical plasmas; Astrophysics - Solar and Stellar Astrophysics; parker solar probe; Physics - Plasma Physics; Physics - Space Physics; plasma nonlinear phenomena; plasma waves; Solar Probe Plus
Diagnosing collisionless energy transfer using field\textendashparticle correlations: Vlasov\textendashPoisson plasmas
Turbulence plays a key role in the conversion of the energy of large-scale fields and flows to plasma heat, impacting the macroscopic evolution of the heliosphere and other astrophysical plasma systems. Although we have long been able to make direct spacecraft measurements of all aspects of the electromagnetic field and plasma fluctuations in near-Earth space, our understanding of the physical mechanisms responsible for the damping of the turbulent fluctuations in heliospheric plasmas remains incomplete. Here we propose a ...
Howes, Gregory; Klein, Kristopher; Li, Tak;
Published by: Journal of Plasma Physics Published on: 02/2017
YEAR: 2017   DOI: 10.1017/S0022377816001197
astrophysical plasmas; parker solar probe; plasma nonlinear phenomena; Solar Probe Plus; space plasma physics