Results 31 to 40 of about 20,493 (125)

Neoclassical tearing mode seeding by Alfvén eigenmode coupling in MAST-U

Nuclear Fusion
We present evidence of tearing mode seeding by nonlinear three-wave coupling of Alfvén eigenmodes in a tokamak plasma. Here, a m,n = 2,1 magnetic island appears to be seeded in a MAST-U discharge by coupling of $n = 2$ and $n = 3$ Alfvén eigenmodes ...
Kitt Thomas, Laszlo Bardoczi, Kieran Gibson, Juan Ruiz Ruiz, Mykola Dreval, David Ryan, Ken McClements, Clive Michael, MAST-U team   +8 more
doaj   +1 more source

Plasma Frequency Waves in Earth's Electron Foreshock

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract At Earth's quasi‐perpendicular bow shock, electrons are reflected and accelerated to high velocities, forming beams. These beams excite Langmuir and beam‐mode waves in the electron foreshock region. The waves can then be converted to radio waves via linear or nonlinear processes.
Daniel B. Graham, Yuri V. Khotyaintsev, Mats André, Andris Vaivads, Iver H. Cairns   +4 more
wiley   +1 more source

Numerical Investigations of Low‐Latitude Ground Magnetic Fields Due To Cavity Mode Oscillations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 9, September 2026.
Abstract Pi2 oscillations are known to be associated with cavity mode oscillations (CMOs) in the inner magnetosphere at low latitudes. CMOs can also be excited by interplanetary shocks on the dayside. We present results from a global linear MHD wave model in spherical coordinates that allows us to analyze these waves at equatorial latitudes.
K. Majmudar, R. L. Lysak, K. Takahashi
wiley   +1 more source

Evidence for Alfvén eigenmodes driven by alpha particles in D-3He fusion experiments on JET [PDF]

, 2021
Alfvén eigenmodes (AEs) driven by energetic alpha particles can lead to enhanced fast ion transport and losses, thereby degrading the plasma performance in ITER and future magnetic confinement fusion reactors.
Kiptily, V.G., JET Contributors, Ben Yaala, M.   +2 more
core   +1 more source

Alfvén Eigenmodes in shear reversed plasmas [PDF]

, 2003
Experiments on JT-60U and JET have shown that plasma configurations with shear reversal are prone to the excitation of unusual Alfvén eigenmodes by energetic particles.
Hawkes, N., Borba, D., Berk, H., Pekker, M., Breizman, B., Pinches, S., Sharapov, S.   +6 more
core  

Spontaneous excitation of geodesic acoustic mode by toroidal Alfvén eigenmodes

, 2013
Spontaneous nonlinear excitation of geodesic acoustic mode (GAM) by toroidal Alfvén eigenmodes (TAE) is studied within the framework of gyrokinetic theory. The dispersion relation for the parametric decays of a pump TAE mode into a TAE lower sideband and
Fulvio Zonca, Zhiyong Qiu, Liu Chen, Zonca, F.   +3 more
core   +1 more source

Excitation of Large Amplitude Compressional ULF Waves in the Magnetosphere by Solar Wind Pressure Spikes and IMF Southward Turning

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract We present a case study of large amplitude, compressional Pc5 waves observed by GOES 13 and 15 at geosynchronous orbit near noon. These waves were excited near the arrival time of two consecutive solar wind dynamic pressure spikes at the magnetopause, the second of which was associated with a large and rapid southward turning of the ...
C. Lazzeri, C. Forsyth, A. Samsonov, A. Fazakerley, M. Archer, T. Elsden, K. J. Trattner, J. Rae, A. W. Degeling   +8 more
wiley   +1 more source

Toroidal modeling of Alfvén eigenmodes excited by runaway electrons in DIII-D and ITER

Nuclear Fusion
The non-perturbative MHD-kinetic hybrid code MARS-K (Liu et al 2014 Phys. Plasmas 21 056105) is updated to include relativistic effects for kinetic fast particles, enabling the code to model excitation of Alfvén eigenmodes (AEs) by runaway electrons (REs)
Yueqiang Liu, Chang Liu, Andrey Lvovskiy
doaj   +1 more source

Broadband Alfvénic excitation correlated to turbulence level in the Wendelstein 7-X stellarator plasmas

Nuclear Fusion, 2023
During the first operational phase (OP1) of the Wendelstein 7-X (W7-X) stellarator, poloidal magnetic field fluctuations, $\dot{B}_{\theta}$ , were measured in several different plasma scenarios with a system of Mirnov coils.
S. Vaz Mendes, K. Rahbarnia, C. Slaby, H. Thomsen, J. Schilling, M. Borchardt, R. Kleiber, A. Könies, J.-P. Bähner, A. von Stechow, T. Sunn Pedersen, T. Klinger, the W7-X Team   +12 more
doaj   +1 more source

Fundamental Poloidal Wave Event Extending From Midnight to Dawn

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract Fundamental poloidal (P1) waves are a class of magnetospheric standing Alfvén waves characterized by field line oscillations in the meridional plane. P1 waves are infrequently excited in the ring current region and are believed to be the source of giant pulsations (Pgs) observed on the ground. Pgs are mostly detected on the morning side with a
Kazue Takahashi, Michael D. Hartinger, Kiyokazu Koga   +2 more
wiley   +1 more source