Krzysztof A. Mizerski
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View article: Geomagnetic reversals and excursions as an outcome of non-equilibrium bulk turbulence in the Earth’s core
Geomagnetic reversals and excursions as an outcome of non-equilibrium bulk turbulence in the Earth’s core Open
SUMMARY We investigate the effect of statistically non-stationary turbulence in the Earth’s outer core on the effective turbulent electromotive force generated by the convectively driven flow of liquid iron and the evolution characteristic…
View article: Tuning of the current drive in tokamaks with phase-shifted beating waves
Tuning of the current drive in tokamaks with phase-shifted beating waves Open
Recent advancements in tokamak devices have allowed for reaching very high plasma temperatures, giving hope for the production of thermonuclear fusion power. The theory of the generation of the electromotive force (EMF) and current drive i…
View article: Geomagnetic Reversals and Excursions as an Outcome of Non‐Equilibrium Wave‐Turbulence and Beating MAC Waves in the Core
Geomagnetic Reversals and Excursions as an Outcome of Non‐Equilibrium Wave‐Turbulence and Beating MAC Waves in the Core Open
The turbulence in the liquid iron within the outer core of the Earth is responsible for the geomagnetic field generation, its sustainment and dynamical evolution. Here we revive Braginsky's idea of the Stratified Ocean at the top of the Co…
View article: The equations of magnetohydrodynamics
The equations of magnetohydrodynamics Open
Derivation of the governing equations of incompressible magnetohydrodynamics: the Navier–Stokes equation which describes the momentum balance for a fluid and the induction equation which governs the magnetic field evolution, supplied by th…
View article: Joint Action and Competition between Centrifugal, Magnetorotational, and Magnetic Buoyancy Instabilities
Joint Action and Competition between Centrifugal, Magnetorotational, and Magnetic Buoyancy Instabilities Open
Instabilities driven by some combination of rotation, velocity shear, and magnetic field in a stratified fluid under gravity play an important role in many astrophysical settings. Of particular note are the centrifugal instability, the mag…
View article: Cross-helicity effect on $α$-type dynamo in non-equilibrium turbulence
Cross-helicity effect on $α$-type dynamo in non-equilibrium turbulence Open
Turbulence is typically not in equilibrium, i.e. mean quantities such as the mean energy and helicity are typically time-dependent. The effect of non-stationarity on the turbulent hydromagnetic dynamo process is studied here with the use o…
View article: Datasets for "Cross-helicity effect on alpha-type dynamo in non-equilibrium turbulence"
Datasets for "Cross-helicity effect on alpha-type dynamo in non-equilibrium turbulence" Open
This directory contains an index.html file with links to the run directories for Runs A-E and idl plotting routines with secondary data for the other figures for the paper "Cross-helicity effect on alpha-type dynamo in non-equilibrium turb…
View article: Datasets for "Cross-helicity effect on alpha-type dynamo in non-equilibrium turbulence"
Datasets for "Cross-helicity effect on alpha-type dynamo in non-equilibrium turbulence" Open
This directory contains an index.html file with links to the run directories for Runs A-E and idl plotting routines with secondary data for the other figures for the paper "Cross-helicity effect on alpha-type dynamo in non-equilibrium turb…
View article: Anisotropic turbulent viscosity and large-scale motive force in thermally driven turbulence at low Prandtl number
Anisotropic turbulent viscosity and large-scale motive force in thermally driven turbulence at low Prandtl number Open
The fully developed turbulent Boussinesq convection is known to form large-scale rolls, often termed the 'large-scale circulation' (LSC). It is an interesting question how such a large-scale flow is created, in particular in systems when t…
View article: Dynamo effect caused by non-stationary turbulence in strongly magnetized, hot, low-density plasma
Dynamo effect caused by non-stationary turbulence in strongly magnetized, hot, low-density plasma Open
Context. The large-scale hydromagnetic dynamo mechanism is often assumed to rely on the existence of a resistive phase shift between the kinetic and magnetic components of waves. It is not clear how this mechanism could effectively operate…
View article: Fully developed anelastic convection with no-slip boundaries
Fully developed anelastic convection with no-slip boundaries Open
Anelastic convection at high Rayleigh number in a plane parallel layer with no slip boundaries is considered. Energy and entropy balance equations are derived, and they are used to develop scaling laws for the heat transport and the Reynol…
View article: Possible Role of Non-Stationarity of Magnetohydrodynamic Turbulence in Understanding of Geomagnetic Excursions
Possible Role of Non-Stationarity of Magnetohydrodynamic Turbulence in Understanding of Geomagnetic Excursions Open
The natural simplifying assumptions often put forward in the theoretical investigations of the magnetohydrodynamic turbulence are that the turbulent flow is statistically isotropic, homogeneous and stationary. Of course, the natural turbul…
View article: Possible risk resulting from the recent decay of the dipolar component of the terrestrial magnetic field
Possible risk resulting from the recent decay of the dipolar component of the terrestrial magnetic field Open
In this study, we investigated the geomagnetic ground observatory data from 1980 to 2011 collected from World Data Center from 134 stations. To analyze the data we have applied spherical harmonic decomposition to obtain components associat…
View article: Vertical heat transport at infinite Prandtl number for micropolar fluid
Vertical heat transport at infinite Prandtl number for micropolar fluid Open
We investigate the upper bound on the vertical heat transport in the fully 3D Rayleigh–Bénard convection problem at the infinite Prandtl number for a micropolar fluid. We obtain a bound, given by the cube root of the Rayleigh number, with …
View article: Renormalization Group Analysis of the Turbulent Hydromagnetic Dynamo: The Effect of Nonstationarity
Renormalization Group Analysis of the Turbulent Hydromagnetic Dynamo: The Effect of Nonstationarity Open
The turbulent hydromagnetic dynamo is a process of magnetic field generation by chaotic flow of an electrically conducting fluid (plasma, liquid iron, etc.). It is responsible for generation of large-scale magnetic fields of astrophysical …
View article: Super-Speeding Jets in MHD Couette Flow
Super-Speeding Jets in MHD Couette Flow Open
A magnetohydrodynamic flow of a viscous and conducting fluid confined between two parallel differentially moving boundaries is considered. The whole system is in a strong magnetic field chosen in such a way that the Hartmann boundary layer…
View article: Subtle structure of streamers under conditions resembling those of Transient Luminous Events
Subtle structure of streamers under conditions resembling those of Transient Luminous Events Open
The paper presents a brief review of the observational facts related to plasma filamentation in astrophysics and the subtle structures of plasma in Transient Luminous Events (TLE’s) and an analysis of the physical mechanism that could cont…