138 citations · 420 across the 18 of their papers we have counts for
18 papers
Yet Another Modification of Relativistic Magnetohydrodynamic Waves: Electron Thermal Inertia
Y. Kawazura
This study investigates the properties of waves in relativistic extended magnetohydrodynamics (RXMHD), which includes Hall and electron thermal inertia effects. We focus on the cas…
Calliope: Pseudospectral shearing magnetohydrodynamics code with a pencil decomposition
Y. Kawazura
The pseudospectral method is a highly accurate numerical scheme suitable for turbulence simulations. We have developed an open-source pseudospectral code, \textsc{\textsf{Calliope}…
Energy partition between Alfvénic and compressive fluctuations in magnetorotational turbulence with near-azimuthal mean magnetic field
Y. Kawazura, A. A. Schekochihin, M. Barnes +2
The theory of magnetohydrodynamic (MHD) turbulence predicts that Alfvénic and slow-mode-like compressive fluctuations are energetically decoupled at small scales in the inertial ra…
Ion versus electron heating in compressively driven astrophysical gyrokinetic turbulence
Y. Kawazura, A. A. Schekochihin, M. Barnes +4
The partition of irreversible heating between ions and electrons in compressively driven (but subsonic) collisionless turbulence is investigated by means of nonlinear hybrid gyroki…
Constraints on ion vs. electron heating by plasma turbulence at low beta
A. A. Schekochihin, Y. Kawazura, M. A. Barnes
It is shown that in low-beta, weakly collisional plasmas, such as the solar corona, some instances of the solar wind, the aurora, inner regions of accretion discs, their coronae, a…
Thermal disequilibration of ions and electrons by collisionless plasma turbulence
Yohei Kawazura, Michael Barnes, Alexander A. Schekochihin
Does overall thermal equilibrium exist between ions and electrons in a weakly collisional, magnetised, turbulent plasma---and, if not, how is thermal energy partitioned between ion…
A Hybrid Gyrokinetic Ion and Isothermal Electron Fluid Code for Astrophysical Plasma
Y. Kawazura, M. Barnes
This paper describes a new code for simulating astrophysical plasmas that solves a hybrid model composed of gyrokinetic ions (GKI) and an isothermal electron fluid (ITEF) [A. Schek…
Modification of magnetohydrodynamic waves by the relativistic Hall effect
Y. Kawazura
This study shows that a relativistic Hall effect significantly changes the properties of wave propagation by deriving a linear dispersion relation for relativistic Hall magnetohydr…
Action Principles for Relativistic Extended Magnetohydrodynamics: A Unified Theory of Magnetofluid Models
Yohei Kawazura, George Miloshevich, Philip J. Morrison
Two types of Eulerian action principles for relativistic extended magnetohydrodynamics (MHD) are formulated. With the first, the action is extremized under the constraints of densi…
Inward Diffusion and Acceleration of Particles Driven by Turbulent Fluctuations in Magnetosphere
Y. Ushida, Y. Kawazura, N. Sato +1
Charged particles in a magnetosphere are spontaneously attracted to a planet while increasing their kinetic energy via inward diffusion process. A constraint on particles' micro-sc…
Measurement of Wave Electric Fields in Plasmas by Electro-Optic Probe
M. Nishiura, Z. Yoshida, T. Mushiake +10
Electric field measurement in plasmas permits quantitative comparison between the experiment and the simulation in this study. An electro-optic (EO) sensor based on Pockels effect…
Anisotropy in broad component of H line in the magnetospheric device RT-1
Yohei Kawazura, Noriki Takahashi, Zensho Yoshida +8
Temperature anisotropy in broad component of H line was found in the ring trap 1 (RT-1) device by Doppler spectroscopy. Since hot hydrogen neutrals emitting a broad component ar…
Self-Organization and Heating by Inward Diffusion in Magnetospheric Plasmas
N. Sato, Z. Yoshida, Y. Kawazura
Through the process of inward diffusion, a strongly localized clump of plasma is created in a magnetosphere. The creation of the density gradient, instead of the usual flattening b…
Observation of particle acceleration in laboratory magnetosphere
Yohei Kawazura, Zensho Yoshida, Masaki Nishiura +7
The self-organization of magnetospheric plasma is brought about by inward diffusion of magnetized particles. Not only creating a density gradient toward the center of a dipole magn…
Hamiltonian Formalism of Extended Magnetohydrodynamics
Hamdi M. Abdelhamid, Yohei Kawazura, Zensho Yoshida
The extended magnetohydrodynamics (MHD) system, including the Hall effect and the electron inertia effect, has a Hamiltonian structure embodied by a noncanonical Poisson algebra on…
Relabeling symmetry in relativistic fluids and plasmas
Yohei Kawazura, Zensho Yoshida, Yasuhide Fukumoto
The conservation of the recently formulated relativistic canonical helicity [Yoshida Z, Kawazura Y, and Yokoyama T 2014 J. Math. Phys. 55 043101] is derived from Noether's theorem…
Relativistic helicity and link in Minkowski space-time
Z. Yoshida, Y. Kawazura, T. Yokoyama
A relativistic helicity has been formulated in the four-dimensional Minkowski space-time. Whereas the relativistic distortion of space-time violates the conservation of the convent…
Comparison of Entropy Production Rates in Two Different Types of Self-organized Flows: Bénard Convection and Zonal flow
Yohei Kawazura, Zensho Yoshida
Entropy production rate (EPR) is often effective to describe how a structure is self-organized in a nonequilibrium thermodynamic system. The "minimum EPR principle" is widely appli…