Results 31 to 40 of about 1,964 (170)

Observation of high frequency Alfvén eigenmodes excited by RF-accelerated minority hydrogen ions in the EAST tokamak

Nuclear Fusion
The paper presents the original observation of high frequency Alfvén eigenmode excited by fast minority hydrogen ions accelerated by ion cyclotron range of frequency waves in EAST. The frequency of high frequency Alfvén eigenmodes is around $0.75\sim 0.8
Lunan Liu, Wei Zhang, Xinjun Zhang, R. Ochoukov, Chengming Qin, Yubao Zhu   +5 more
doaj   +1 more source

Damping of vertical coronal loop kink oscillations through wave tunneling [PDF]

, 2005
The decay rate of vertical kink waves in a curved flux tube is modeled numerically. The full MHD equations are solved for a curved equilibrium flux tube in an arcade geometry and the decay of ψ, the integral over the flux tube of the modulus of the ...
Arber, T. D., Brady, Christopher S.
core   +1 more source

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

Observation of modes in the sub-cyclotronic range of frequencies in JET

Nuclear Fusion
The excitation of modes in the JET tokamak in the sub-cyclotronic range of frequencies (frequencies comprised between the Alfvén frequency and the cyclotron frequency) is for the first time reported.
F. Nabais, D. Borba, R. Coelho, J. Ferreira, A. Figueiredo, P. Rodrigues, S.E. Sharapov, JET Contributors   +7 more
doaj   +1 more source

Resonantly damped surface and body MHD waves in a solar coronal slab with oblique propagation

, 2007
The theory of magnetohydrodynamic (MHD) waves in solar coronal slabs in a zero-$\beta$ configuration and for parallel propagation of waves does not allow the existence of surface waves. When oblique propagation of perturbations is considered both surface
A.J. Díaz, A.J. Díaz, A.J. Díaz, A.J. Miles, B. Roberts, B. Roberts, B. Roberts, B. Roberts, B. Roberts, C.J. Schrijver, C.S. Brady, E. Verwichte, E. Verwichte, E. Verwichte, G. Sewell, H.C. Spruit, I. Arregui, I. Arregui, I. Arregui, I. Zhelyazkov, J. Andries, J. Andries, J. L. Ballester, J. Terradas, J. Terradas, J. Terradas, J. Terradas, J.V. Hollweg, J.V. Hollweg, J.V. Hollweg, J.V. Hollweg, K. Murawski, K. Murawski, K. Murawski, M. Goossens, M. Goossens, M. Goossens, M. Goossens, M.A. Lee, M.J. Aschwanden, M.J. Aschwanden, M.J. Aschwanden, M.J. Aschwanden, M.P. McEwan, M.P. Ryutova, M.S. Ruderman, M.S. Ruderman, M.V. Dymova, P.M. Edwin, P.M. Edwin, P.M. Edwin, R. Jain, R. Oliver, S. Poedts, T. Doorsselaere Van, T. Sakurai, V.M. Nakariakov, V.M. Nakariakov, V.M. Nakariakov, V.M. Nakariakov, V.M. Nakariakov, Y. Uchida   +61 more
core   +1 more source

Resonant Vibrational Excitation and Overtone Vibrational Emissions of Nitric Oxide (NO) in Sub‐Auroral Ion Drift (SAID) Region: A Source of STEVE Continuum Emission

Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.
Abstract At elevated electron temperature (Te≥3000°K ${T}_{e}\mathit{\ge }3000\mathit{{}^{\circ}}\mathrm{K}$) inside Sub‐Auroral Ion Drift, resonant vibrational excitation (RVE) increases the vibrationally excited (v≥8 $v\mathit{\ge }8$) nitric oxide (NO) population in the E‐region, which undergoes overtone vibrational emissions (Δv≥8 ${\Delta }v ...
Andrew W. Yau, Andrew D. Howarth, William K. Peterson   +2 more
wiley   +1 more source

Efficiency of Electromagnetic Energy Transfer From Solar Wind to Ionosphere Through Magnetospheric Ultra‐Low Frequency Waves

Geophysical Research Letters, Volume 53, Issue 1, 16 January 2026.
Abstract Ultra‐low frequency (ULF) waves are a ubiquitous carrier of energy in geospace. However, their efficiency in transferring solar wind energy into the upper atmosphere remains a fundamental and not well‐understood question. This is due to their global presence, which cannot be fully quantified by spatially limited observations, and the need for ...
Dong Lin, Michael Hartinger, William Lotko, Wenbin Wang, Xueling Shi, Kareem Sorathia, Bharat Kunduri, Viacheslav Merkin, Kevin Pham, Michael Wiltberger   +9 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

Control of ULF wave accessibility to the inner magnetosphere by the convection of plasma density [PDF]

, 2018
During periods of storm activity and enhanced convection, the plasma density in theafternoon sector of the magnetosphere is highly dynamic due to the development of plasmasphericdrainage plume (PDP) structure.
Abe, Allan, Allan, Allan, Boyd, Carpenter, Chen, Chi, Claudepierre, Claudepierre, D'haeseleer, Degeling, Degeling, Degeling, Degeling, Degeling, Dent, Dent, Denton, Elkington, Fälthammar, Gillis, Glassmeier, Goldstein, Hasegawa, Herrera, Hwang, Kabin, Kale, Kale, Kepko, Kessel, Kim, Lee, Li, Lysak, Mann, Mills, Nunn, O'Brien, Piersanti, Rae, Rankin, Roederer, Russell, Samson, Sandel, Scholer, Shprits, Singer, Stern, Stern, Tan, Turner, Vellante, Volland, Walker, Walker, Zong   +58 more
core   +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