Results 31 to 40 of about 196 (131)

Properties of Magnetohydrodynamic Modes in Compressively Driven Plasma Turbulence

Physical Review X, 2020
We study properties of magnetohydrodynamic (MHD) eigenmodes by decomposing the data of MHD simulations into linear MHD modes—namely, the Alfvén, slow magnetosonic, and fast magnetosonic modes.
K. D. Makwana, Huirong Yan
doaj   +1 more source

Prediction of the Wave Normal Angle of Proton‐Band EMIC Waves Near Geosynchronous Orbit

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract We investigate how the wave normal angle (WNA) and polarization of proton‐band electromagnetic ion cyclotron (EMIC) waves change as they travel from their source to Earth. This paper marks a significant milestone as the first full‐wave simulation of proton‐band EMIC waves reflecting from the ionosphere.
Eun‐Hwa Kim, Khan‐Hyuk Kim, Jay R. Johnson, Peter A. Damiano, Syun'ichi Shiraiwa, Yu Lin, Wesley Martin   +6 more
wiley   +1 more source

Experimental study of core-localized TAEs during ICRF heated high βp plasmas on EAST

Nuclear Fusion
This study presents the first experimental investigation of core-localized Toroidal Alfvén eigenmodes (TAEs) during high- β _p plasmas heated purely by radio frequency waves (particularly ion cyclotron resonance frequency) on EAST.
C.Y. Pan, J. Huang, J. Varela, X.H. Wang, Y.X. Sun, Z.Q. Zhou, X.Z. Gong, X.J. Zhang, A. Ti, T.H. Shi, T. Zhang, Q. Zang, G.Q. Zhong, Y.B. Zhang, G.L. Lin, Z.C. Lin, the EAST Team   +16 more
doaj   +1 more source

Excitation of toroidal Alfvén eigenmodes with counter-current NBI in the TCV tokamak

Nuclear Fusion, 2023
In Tokamak á Configuration Variable (TCV), unstable modes excited by resonant interaction between the shear Alfvèn waves in continuum gaps and energetic particles have been observed in scenarios with neutral beam injection (NBI).
M. Vallar, M. Dreval, M. Garcia-Munoz, S. Sharapov, J. Poley, A. N. Karpushov, P. Lauber, S. Mazzi, L. Porte, the TCV Team   +9 more
doaj   +1 more source

Theory and Modeling of Large Scale Plasmapause Surface Waves

Journal of Geophysical Research: Space Physics, Volume 130, Issue 9, September 2025.
Abstract The plasmapause in Earth's magnetosphere represents the boundary between the plasma which co‐rotates with the Earth (plasmasphere), and the more tenuous plasmatrough outside. The density change across the plasmapause can be large, changing by approximately 1–2 orders of magnitude depending on the prevailing conditions. This would suggest it to
T. Elsden, D. J. Southwood, O. Allanson, M. O. Archer, M. D. Hartinger, A. N. Wright   +5 more
wiley   +1 more source

Double Auroral Undulation During the Main Phase of the May 10–11, 2024 Storm

AGU Advances, Volume 6, Issue 4, August 2025.
Abstract We report the discovery of a new type of aurora, namely, double auroral undulation that occurred simultaneously on both equatorward and poleward edges of the duskside auroral oval during the main phase of the May 10–11, 2024 superstorm. Whereas the equatorward auroral undulation (EAU) has been frequently observed and well known, the poleward ...
Yongliang Zhang, Tetsuo Motoba, Larry Paxton, Robert Schaefer   +3 more
wiley   +1 more source

Isotope impact on Alfvén eigenmodes and fast ion transport in DIII-D

Nuclear Fusion
Measurements of beam driven Alfvén Eigenmode (AE) activity in matched deuterium (D) and hydrogen (H) DIII-D plasmas show a dramatic difference in unstable mode activity and fast ion transport for a given injected beam power.
M.A. Van Zeeland, E. Bass, X.D. Du, W.W. Heidbrink, C. Chrystal, C. Crocker, G. DeGrandchamp, S. Haskey, D. Liu, J. Gonzalez-Martin, K.E. Thome, G. Yu, Y. Zhu   +12 more
doaj   +1 more source

Can ECH Wave Scattering Explain the Unaccounted Electron Loss During the 17 March 2013 Geomagnetic Storm?

Journal of Geophysical Research: Space Physics, Volume 130, Issue 5, May 2025.
Abstract The interaction of electrons with electrostatic electron cyclotron harmonic (ECH) waves in the Earth's magnetosphere can lead to the scattering of plasma sheet electrons into the atmospheric loss cone, affecting the evolution of electron phase space density.
Katja Stoll, Leonie Pick, Dedong Wang, Bernhard Haas, Xing Cao, Binbin Ni, Yuri Shprits   +6 more
wiley   +1 more source

Shear Alfvén waves within magnetic islands

Nuclear Fusion
We calculate Alfvén eigenmodes within a magnetic island (MiAE) which have been conjectured over a decade ago. Starting from a cylindrical plasma equilibrium, we calculate the complete metric of the island interior assuming an iota profile with a constant
Axel Könies, Jinjia Cao, Ralf Kleiber
doaj   +1 more source

Driving Earth's Outer Radiation Belt With Alfvénic Turbulence

Geophysical Research Letters, Volume 52, Issue 8, 28 April 2025.
Abstract Semi‐empirical coefficients for electron transport in Alfvénic turbulence are used to drive the global evolution of energetic electron distributions through Earth's outer radiation belt. It is shown how these turbulent fields facilitate radial transport and pitch‐angle scattering that drive losses through the magnetopause, into the plasma ...
C. C. Chaston
wiley   +1 more source