Results 41 to 50 of about 158 (153)

Nonlinear Gyrokinetic Simulation of the Magnetosphere‐Ionosphere Feedback Coupling

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract A nonlinear gyrokinetic simulation is applied to the magnetosphere‐ionosphere (M‐I) coupling system to investigate spontaneous growth of auroral structures and electron acceleration self‐consistently. Perturbations of electron density, potential and field‐aligned current in the auroral ionosphere develop through the feedback instability ...
T.‐H. Watanabe, K. Fujita, S. Maeyama
wiley   +1 more source

Growth of Auroral Structures, Vortex Formation, Turbulence Transition, and Energy Cascade in Alfvénic Magnetosphere‐Ionosphere Coupling

Geophysical Research Letters, Volume 52, Issue 20, 28 October 2025.
Abstract Magnetohydrodynamic simulations of the Alfvénic magnetosphere‐ionosphere (M‐I) coupling reveal a comprehensive picture of nonlinear development of the feedback instability, demonstrating spontaneous growth of auroral structures of density and current enhancements, vortex formation, turbulence transition, and energy cascade.
T.‐H. Watanabe, K. Fujita, S. Maeyama
wiley   +1 more source

T3ST code: turbulent transport in tokamaks via stochastic trajectories

Nuclear Fusion
We introduce the Turbulent Transport in Tokamaks via Stochastic Trajectories (T3ST) code, designed to address the problem of turbulent transport using a statistical approach complementary to gyrokinetics.
D.I. Palade, L.M. Pomârjanschi
doaj   +1 more source

Searching for Universality of Turbulence in the Earth's Magnetosphere

Journal of Geophysical Research: Space Physics, Volume 130, Issue 10, October 2025.
Abstract Turbulence in space plasmas remains a fundamental challenge, and Earth's magnetosphere (MSP) offers a natural laboratory for its study. Using high‐resolution magnetic field data from the Magnetospheric Multiscale (MMS) mission, we extend a stochastic Markovian framework to analyze turbulence across 10 diverse magnetospheric regions, including ...
Dariusz Wójcik, Wiesław M. Macek
wiley   +1 more source

Hamiltonian gyrokinetic Vlasov–Maxwell system [PDF]

Physics Letters A, 2015
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
J.W. Burby, A.J. Brizard, P.J. Morrison, H. Qin   +3 more
openaire   +1 more source

A h‐Adaptivity Strategy for Hybridizable Discontinuous Galerkin (HDG) Simulations of Fluid Transport Models in Tokamak Plasma

International Journal for Numerical Methods in Engineering, Volume 126, Issue 17, 15 September 2025.
ABSTRACT The highly anisotropic, multi‐scale nature of fusion plasma simulations in tokamaks, combined with the complexity in the geometries of plasma‐facing components and magnetic equilibrium, challenges numerical schemes. They therefore require the development of advanced numerical techniques to enhance computational efficiency and enable codes to ...
Marcello Capasso, Ivan Kudashev, Frédéric Schwander, Éric Serre   +3 more
wiley   +1 more source

Fast and Invertible Simplicial Approximation of Magnetic‐Following Interpolation for Visualizing Fusion Plasma Simulation Data

Computer Graphics Forum, Volume 44, Issue 3, June 2025.
Abstract We introduce a fast and invertible approximation for fusion plasma simulation data represented as 2D planar meshes with connectivities approximating magnetic field lines along the toroidal dimension in deformed 3D toroidal spaces. Scientific variables (e.g., density and temperature) in these fusion data are interpolated following a complex ...
Congrong Ren, Robert Hager, Randy Michael Churchill, Albert Mollén, Seung‐Hoe Ku, Choong‐Seock Chang, Hanqi Guo   +6 more
wiley   +1 more source

On Validity of Gyrokinetic Theory

, 2023
We study the validity of gyrokinetic theory by examining the destruction of magnetic moment adiabatic invariant in the presence of fluctuations. Contrary to common assertions, it is shown for the first time that the gyrokinetic theory rests not only on the magnetic moment conservation, but also on the fact that the particle dynamics constitutes a ...
Chen, Haotian, Chen, Liu, Zonca, Fulvio, Li, Jiquan, Xu, Min   +4 more
openaire   +2 more sources

Statistical Study of Electron Kinetic Entropy Generation at Earth's Quasi‐Perpendicular Bow Shock

Journal of Geophysical Research: Space Physics, Volume 130, Issue 1, January 2025.
Abstract We use the Magnetospheric Multiscale mission to study electron kinetic entropy across Earth's quasi‐perpendicular bow shock. We perform a statistical study of how the change in electron entropy depends on the different plasma parameters associated with a collisionless shock crossing.
M. Lindberg, A. Wallner, S. Berglund, A. Vaivads   +3 more
wiley   +1 more source

First-principle based predictions of the effects of negative triangularity on DTT scenarios

Nuclear Fusion
Plasmas with negative triangularity (NT) shape have been recently shown to be able to achieve H-mode levels of confinement in L-mode, avoiding detrimental edge localised modes.
A. Mariani, A. Balestri, P. Mantica, G. Merlo, R. Ambrosino, L. Balbinot, D. Brioschi, I. Casiraghi, A. Castaldo, L. Frassinetti, V. Fusco, P. Innocente, O. Sauter, G. Vlad   +13 more
doaj   +1 more source