Results 41 to 50 of about 20,493 (125)

Alfvén eigenmodes in the RFX-mod reversed-field pinch plasma

, 2011
High-frequency magnetic activity has been detected at the edge region of the RFX-mod reversed-field pinch (RFP) device. The analysis, performed by means of an insertable probe measuring the magnetic field fluctuations, shows coherent modes clearly ...
F. Auriemma, M. Zuin, M. Spolaore, E. Martines, S. Spagnolo, R. Cavazzana, N. Vianello, M Zuin, R Cavazzana, F Auriemma, M Spolaore, E Martines, S Spagnolo, N Vianello   +13 more
core   +1 more source

Inertial Alfvén Waves With Magnetosphere‐Ionosphere Coupling and Feedback

Journal of Geophysical Research: Space Physics, Volume 131, Issue 7, July 2026.
Abstract We present a theory of the ionospheric feedback instability (IFI) in which the finite‐thickness h $h$ of the ionosphere is represented by a frequency‐ and scale‐dependent height‐integrated Pedersen conductance, YI≡∑inΩ,k⊥,h, ${Y}_{\mathrm{I}}\equiv {\mathrm{\sum }}_{\text{in}}\left({\Omega },{k}_{\perp },h\right),$ electromagnetically coupled ...
R. Rankin, Q.‐G. Zong, W. Wang
wiley   +1 more source

Nonlinear Evolution of Auroral Fine Structures Through the Feedback Instability in a Dipole Field Configuration

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract Nonlinear simulations of the feedback instability in the Alfvénic magnetosphere‐ionosphere (M‐I) coupling system have been carried out by means of the reduced magnetohydrodynamic (MHD) equations with spatially non‐uniform kinematic viscosity and resistivity, coupled with two‐fluid equations, in order to investigate auroral fine‐structure ...
T. Sakaki, T.‐H. Watanabe
wiley   +1 more source

Enhanced Localized Energetic-Ion Losses Resulting from Single-Pass Interactions with Alfvén Eigenmodes [PDF]

, 2013
We report the first observation of prompt neutral beam-ion losses due to nonresonant scattering induced by toroidal and reversed shear Alfvén eigenmodes in the DIII-D tokamak.
Austin, ME, Heidbrink, WW, Petty, CC, Van Zeeland, MA, Fisher, RK, Pace, DC, Nazikian, R, Kramer, GJ, Chen, X   +8 more
core   +1 more source

Effect of Field Line Torsion on the Polarization of ULF Waves

Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.
Abstract In this paper we suggest a simple modification of the dipole magnetic field which introduces field‐aligned currents and torsion to the field lines. The resulting field lines are not contained in the meridional planes and have resemblance to the geomagnetic field lines in the dawn and dusk flanks of the magnetosphere. We analyze polarization of
K. Kabin, A. W. Degeling, R. Rankin
wiley   +1 more source

FOXTAIL: Modeling the nonlinear interaction between Alfvén eigenmodes and energetic particles in tokamaks

, 2016
FOXTAIL is a new hybrid magnetohydrodynamic-kinetic code used to describe interactions between energetic particles and Alfvén eigenmodes in tokamaks with realistic geometries.
Tholerus, Emmi, Hellsten, Torbjörn, Johnson, Thomas,, Tholerus, Emmi,, Johnson, Thomas, Hellsten, Torbjörn,   +5 more
core   +3 more sources

Kelvin‐Helmholtz Stability Analysis as a Function of Dipole Tilt and Solar Wind Property

Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.
Abstract Kelvin‐Helmholtz instabilities (KHIs) play a critical role in facilitating mass and momentum transport across the magnetopause boundary. Recent studies have demonstrated that KHI occurrence exhibits both seasonal and diurnal variability, with enhanced activity when Earth's magnetic dipole is more closely aligned with the northward direction in
Alexander Navarro, Xuanye Ma, Jay Johnson, Simon Wing, Shiva Kavosi, Yu‐Lun Liou   +5 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

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

Beta-induced Alfvén eigenmodes and geodesic acoustic modes in the presence of strong tearing activity during the current ramp-down on JET

, 2022
The analysis of the current ramp-down phase of JET plasmas has revealed the occurrence of additional magnetic oscillations in pulses characterized by large magnetic islands.
Dumont, R., Falessi, M. V., Stamp, M. F., Baruzzo, M., Lomas, P., Zonca, F., Hobirk, J., Kappatou, A., King, D., Kiptily, V., Auriemma, F., Pucella, G., Kiptily, V. G., Frigione, D., Keeling, D., Maslov, M., Sirén, Paula, Van Eester, D., Giovannozzi, E., Stancar, Z., Sun, H., Buratti, P., Stamp, M., Alessi, E., Challis, C., Falessi, M., Zerbini, M., Garzotti, L., Siren, P., Sozzi, C., Lerche, E., Nunes, I., Rimini, F., Challis, C. D., Keeling, D. L., Lomas, P. J., Auriemma F, Baruzzo M., Keeling DL, Buratti P, Alessi E, Lomas PJ, Stamp M. F., Keeling D. L., Alessi E., Zerbini M, Maslov M., Sun H, Zerbini M., Siren P, Sun H., Kiptily VG, Zonca F, Stancar Z, Falessi MV, King D., Giovannozzi E., Hobirk J, Pucella G, Nunes I, Kappatou A., Lerche E, Maslov M, Stamp MF, Frigione D., Stancar Z., Zonca F., Siren P., Frigione D, Garzotti L., Challis C. D., Garzotti L, Kiptily V. G., Lerche E., Dumont R., Dumont R, Lomas P. J., Hobirk J., Auriemma F., Challis CD, Rimini F, Pucella G., Rimini F., Van Eester D, Buratti P., King D, Van Eester D., Baruzzo M, Sozzi C, Falessi M. V., Sozzi C., Giovannozzi E, Kappatou A, Nunes I., D L Keeling, P Buratti, F Rimini, E Alessi, M Zerbini, M Baruzzo, C D Challis, R Dumont, G Pucella, L Garzotti, H Sun, M F Stamp, F Auriemma, E Giovannozzi, V G Kiptily, I Nunes, A Kappatou, M Maslov, P J Lomas, M V Falessi, E Lerche, C Sozzi, Z Stancar, P Sirén, F Zonca, D Van Eester, D King, D Frigione, J Hobirk   +122 more
core   +1 more source