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Found 6 entries in the Bibliography.
Showing entries from 1 through 6
2021 
Between the base of the solar corona at $r=r_\textrm b$ and the Alfvén critical point at $r=r_\textrm A$, where $r$ is heliocentric distance, the solarwind density decreases by a factor $ \mathop > \limits_∼ 10^5$, but the plasma temperature varies by a factor of only a few. In this paper, I show that such quasiisothermal evolution out to $r=r_\textrm A$ is a generic property of outflows powered by reflectiondriven Alfvénwave (AW) turbulence, in which outwardpropagating AWs partially reflect, and counterpropagating ... Published by: Journal of Plasma Physics Published on: 05/2021 YEAR: 2021 DOI: 10.1017/S0022377821000052 astrophysical plasmas; space plasma physics; Astrophysics  Solar and Stellar Astrophysics; Physics  Plasma Physics; Physics  Space Physics; Parker Data Used 
On the violation of the zeroth law of turbulence in space plasmas The zeroth law of turbulence states that, for fixed energy input into largescale motions, the statistical steady state of a turbulent system is independent of microphysical dissipation properties. This behaviour, which is fundamental to nearly all fluidlike 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 Alfvénwave (AW) energy flux. AWs energize the solar wind via two mechanisms: heating and work. We use highresolution direct numerical simulations of reflectiondriven AW turbulence (RDAWT) in a fastsolarwind 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 solarwind 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 
2019 
Reflectiondriven 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 
2018 
Parametric instability, inverse cascade and the range of solarwind turbulence In this paper, weakturbulence theory is used to investigate the nonlinear evolution of the parametric instability in threedimensional lowβ 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 
2017 
Turbulence plays a key role in the conversion of the energy of largescale 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 nearEarth 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 
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