Results 61 to 70 of about 20,493 (125)

Spectroscopic determination of kinetic parameters for frequency sweeping Alfvén eigenmodes

, 2010
International audienceA method for analyzing fundamental kinetic plasma parameters, such as linear drive and external damping rate, based on experimental observations of chirping Alfvén eigenmodes, is presented.
Idomura, Y., Y. Idomura, X. Garbet, null null, Garbet, X., Lesur, Maxime, M. Lesur, Shinohara, K., K. Shinohara   +8 more
core   +1 more source

Simultaneous measurements of unstable and stable Alfvén eigenmodes in JET

, 2022
In this paper, we report the novel experimental observation of both unstable and stable toroidicity-induced Alfvén eigenmodes (TAEs) measured simultaneously in a JET tokamak plasma.
Ye.O. Kazakov, Kazakov, Ye.O., Tinguely, R. Alex, Dowson, S., Baruzzo, M., Ongena, J., M. Porkolab, M. Baruzzo, Fasoli, A., Kumar, I., N. Fil, Fil, N., J. Gonzalez-Martin, JET Contributors, Podestà, M., J. Ongena, Gonzalez-Martin, J., R.A. Tinguely, S. Dowson, M. Nocente, Nocente, M., Ž. Štancar, Stancar, Z., Porkolab, Miklos, Nave, M.F.F., M.F.F. Nave, Puglia, P.G., M. Podestà, P.G. Puglia, A. Fasoli, I. Kumar   +30 more
core   +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

Exact Nonlinear Decomposition of Ideal-MHD Waves Using Eigenenergies

The Astrophysical Journal
In this paper, we introduce a new method for exact decomposition of propagating, nonlinear magnetohydrodynamic (MHD) disturbances into their component eigenenergies associated with the familiar slow, Alfvén, and fast wave eigenmodes, and the entropy and ...
Axel Raboonik, Lucas A. Tarr, David I. Pontin   +2 more
doaj   +1 more source

Improving fast-ion confinement in high-performance discharges by suppressing Alfvén eigenmodes [PDF]

, 2017
We show that the degradation of fast-ion confinement in steady-state DIII-D discharges is quantitatively consistent with predictions based on the effects of multiple unstable Alfvén eigenmodes on beam-ion transport.
G.J. Kramer, C. Holcomb, M.A. Van Zeeland, Podestà, M, Y. Zhu, Solomon, W, N.N. Gorelenkov, L. Cui, Gorelenkov, NN, R. Nazikian, Heidbrink, WW, Cui, L, M. Podestà, Van Zeeland, MA, W. Solomon, B. Grierson, Nazikian, R, Holcomb, C, Grierson, B, Kramer, GJ, Zhu, Y, W.W. Heidbrink   +21 more
core   +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

Modeling of frequency-sweeping Alfvén modes in the TJ-II stellarator

Nuclear Fusion
Alfvénic activity has been observed in the TJ-II stellarator which resembles the frequency sweeping demonstrated by Alfvén cascade modes in tokamaks. A numerical validation study was conducted using a reduced magnetohydrodynamic (MHD) model to show that ...
A.G. Ghiozzi, M.J. Mantsinen, P. Pastells, D.A. Spong, A.V. Melnikov, L.G. Eliseev, S.E. Sharapov   +6 more
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

Runaway electrons and Alfvén eigenmodes in tokamaks

, 2006
Runaway electrons can be generated as a consequence of the rapid thermal quench of the plasma in a tokamak disruption. If the time scale of this cooling is short compared to the collision time in the tail of the electron velocity distribution, incomplete
Smith, Håkan
core   +1 more source

Acoustic Rayleigh Wave Turbulence in Soft Viscoelastic Matter

Advanced Science, Volume 12, Issue 15, April 17, 2025.
Discrete acoustic Rayleigh wave turbulence (DARWT) is observed on the free surface of viscoelastic materials under monochromatic excitation. Governed by bulk shear rigidity supporting inertial modes against surface tension, the nonlinear Rayleigh waves exhibit distinct power‐law scaling and turbulence features in their Kolmogorov–Zakharov spectra. This
Mikheil Kharbedia, Horacio López‐Menéndez, Basilio Javier García, Manuel G. Velarde, Francisco Monroy   +4 more
wiley   +1 more source