183 citations · 1.7k across the 55 of their papers we have counts for
20 papers · 1 filter
Sub-ion scale current sheets in kinetic Alfvén wave turbulence
Johan Sharma, Ch Akshath Kumar, Kirit D. Makwana +2
3D kinetic particle-in-cell (PIC) simulations are performed using the kinetic Alfvén wave (KAW) eigenvector relations from a two-fluid model as initial conditions, in order to stud…
Scale Separation Effects on Simulations of Plasma Turbulence
Jago Edyvean, Tulasi N. Parashar, Tom Simpson +7
Understanding plasma turbulence requires a synthesis of experiments, observations, theory, and simulations. In the case of kinetic plasmas such as the solar wind, the lack of colli…
Higher-order nonequilibrium term: Effective power density quantifying evolution towards or away from local thermodynamic equilibrium
M. Hasan Barbhuiya, Paul A. Cassak, Subash Adhikari +3
A common approach to assess the nature of energy conversion in a classical fluid or plasma is to compare power densities of the various possible energy conversion mechanisms. A for…
Statistics of Turbulence in the Solar Wind. I. What is the Reynolds Number of the Solar Wind?
Daniel Wrench, Tulasi N. Parashar, Sean Oughton +2
The Reynolds number, Re, is an important quantity for describing a turbulent flow. It tells us about the bandwidth over which energy can cascade from large scales to smaller ones,…
Scale Filtering Analysis of Kinetic Reconnection and its Associated Turbulence
Subash Adhikari, Yan Yang, William H. Matthaeus +3
Previously, using an incompressible von Kármán-Howarth formalism, the behavior of cross-scale energy transfer in magnetic reconnection and turbulence was found to be essentially id…
Effective Viscosity, Resistivity, and Reynolds Number in Weakly Collisional Plasma Turbulence
Yan Yang, William H. Matthaeus, Sean Oughton +6
We examine dissipation and energy conversion in weakly collisional plasma turbulence, employing in situ observations from the Magnetospheric Multiscale (MMS) mission and kinetic Pa…
Statistics of Pressure Fluctuations in Turbulent Kinetic Plasmas
Subash Adhikari, William H. Matthaeus, Tulasi N. Parashar +2
In this study we explore the statistics of pressure fluctuations in kinetic collisionless turbulence. A 2.5D kinetic particle-in-cell (PIC) simulation of decaying turbulence is use…
Effect of a guide field on the turbulence like properties of magnetic reconnection
Subash Adhikari, Michael A. Shay, Tulasi N. Parashar +4
The effect of an external guide field on the turbulence-like properties of magnetic reconnection is studied using five different 2.5D kinetic particle-in-cell (PIC) simulations. Th…
Energy Dissipation in Turbulent Reconnection
R. Bandyopadhyay, A. Chasapis, W. H. Matthaeus +6
We study the nature of pressure-strain interaction at reconnection sites, detected by NASA's Magnetospheric Multiscale (MMS) Mission. We employ data from a series of published case…
Magnetic reconnection as an energy cascade process
S. Adhikari, T. N. Parashar, M. A. Shay +5
Reconnection and turbulence are two of the most commonly observed dynamical processes in plasmas, but their relationship is still not fully understood. Using 2.5D kinetic particle-…
A Detailed Examination of Anisotropy and Timescales in Three-dimensional Incompressible Magnetohydrodynamic Turbulence
Rohit Chhiber, William H. Matthaeus, Sean Oughton +1
When magnetohydrodynamic turbulence evolves in the presence of a large-scale mean magnetic field, an anisotropy develops relative to that preferred direction. The well-known tenden…
Reconnection from a Turbulence Perspective
S. Adhikari, M. A. Shay, T. N. Parashar +6
The spectral properties associated with laminar, anti-parallel reconnection are examined using a 2.5D kinetic particle in cell (PIC) simulation. Both the reconnection rate and the…
Finite Dissipation in Anisotropic Magnetohydrodynamic Turbulence
Riddhi Bandyopadhyay, S. Oughton, M. Wan +3
In presence of an externally supported, mean magnetic field a turbulent, conducting medium, such as plasma, becomes anisotropic. This mean magnetic field, which is separate from th…
Turbulent electromagnetic fields at sub-proton scales: two-fluid and full-kinetic plasma simulations
C. A. González, T. Parashar, D. Gomez +2
Plasma dynamics is a multi-scale problem that involves many spatial and temporal scales. Turbulence connects the disparate scales in this system through a cascade that is establish…
Single-mode nonlinear Langevin emulation of magnetohydrodynamic turbulence
Riddhi Bandyopadhyay, William H. Matthaeus, Tulasi N. Parashar
Based on the Langevin equation of Brownian motion, we present a simple model that emulates a typical mode in incompressible magnetohydrodynamic turbulence, providing a demonstratio…
Magnetosperic Multiscale (MMS) observation of plasma velocity-space cascade: Hermite representation and theory
S. Servidio, A. Chasapis, W. H. Matthaeus +10
Plasma turbulence is investigated using high-resolution ion velocity distributions measured by the Magnetospheric Multiscale Mission (MMS) in the Earth's magnetosheath. The particl…
Energy transfer, pressure tensor and heating of kinetic plasma
Y. Yang, W. H. Matthaeus, T. N. Parashar +6
Kinetic plasma turbulence cascade spans multiple scales ranging from macroscopic fluid flow to sub-electron scales. Mechanisms that dissipate large scale energy, terminate the iner…
Turbulent Dissipation Challenge -- Problem Description
Tulasi N Parashar, Chadi Salem, Robert Wicks +4
The goal of this document is to present a detailed description of the goals, simulation setup and diagnostics for the Turbulent Dissipation Challenge (arXiv:1303.0204) as discussed…
Turbulent Dissipation Challenge: A community Driven Effort
Tulasi N. Parashar, Chadi Salem
The goal of the present document is to present the idea of, and convince the community to participate in, Turbulent Dissipation Challenge. The idea was discussed in Solar Heliosphe…
Kinetic dissipation and anisotropic heating in a turbulent collisionless plasma
T. N. Parashar, M. A. Shay, P. A. Cassak +1
The kinetic evolution of the Orszag-Tang vortex is studied using collisionless hybrid simulations. In the magnetohydrodynamic regime this vortex leads rapidly to broadband turbulen…