Results 21 to 30 of about 10,009 (174)

The Potential Role of Modified Electron Acoustic Wave and Nonlinear Mode Coupling in Mono‐Energetic Aurora

Geophysical Research Letters, 2023
Results from a 1D kinetic simulation, for the first time, reveal the important role of modified electron acoustic wave (MEAW) in auroral electron acceleration.
Run Shi, Jun Liang, Zejun Hu, Desheng Han, Xuejing Li   +4 more
doaj   +1 more source

Non-linear spherical Alfvén waves

Monthly Notices of the Royal Astronomical Society, 1998
We present an one-dimensional numerical study of Alfven waves propagating along a radial magnetic field. Neglecting losses, any spherical Alfven wave, no matter how small its initial amplitude is, becomes nonlinear at sufficiently large radii. From previous simulations of Alfven waves in plane parallel atmospheres we did expect the waves to steepen and
Torkelsson, Ulf, Boynton, G. Christopher
openaire   +2 more sources

Alfvén-Wave Instability of Current Sheets in Force-Free Collisionless Plasmas [PDF]

, 1999
If the current sheet between adjacent twisted magnetic flux tubes is sufficiently thin, the electron flow velocity becomes comparable to the Alfvén velocity and can destabilize collisionless Alfvén waves.
Bellan, P. M.
core   +1 more source

Nonlinear Interaction of Low-frequency Alfvén Waves and Ions

The Astrophysical Journal, 2023
The interaction between Alfvén waves and particles is a critical phenomenon in space and laboratory plasmas, and it has been observed that low-frequency Alfvén waves can accelerate and heat ions through subharmonic resonant interactions.
Xianshu Wu, Chao Shen, Jingchun Li, Jiaqi Dong, Kehua Li   +4 more
doaj   +1 more source

On the validity of nonlinear Alfvén resonance in space plasmas [PDF]

, 2008
Aims. In the approximation of linear dissipative magnetohydrodynamics (MHD), it can be shown that driven MHD waves in magnetic plasmas with high Reynolds number exhibit a near resonant behaviour if the frequency of the wave becomes equal to the local ...
Arregui, Aschwanden, Aschwanden, Ballai, Ballai, Braginskii, C. T. M. Clack, Clack, DeForest, Erdélyi, Erdélyi, Erdélyi, Goedbloed, Goedbloed, Goossens, Goossens, Goossens, Goossens, I. Ballai, Kai, M. S. Ruderman, Mocanu, Nakariakov, Ofman, Poedts, Poedts, Robbrecht, Ruderman, Ruderman, Ruderman, Ruderman, Ruderman, Sakurai, Terradas, Verth, Verth   +35 more
core   +3 more sources

First direct observation of a torsional Alfvén oscillation at coronal heights [PDF]

, 2019
Context. Torsional Alfvén waves are promising candidates for the transport of energy across different layers of the solar atmosphere. They have been predicted theoretically for decades.
Froment, Clara, Kohutova, Petra, Verwichte, E. (Erwin)   +2 more
core   +4 more sources

Alfvén‐Fast Wave Coupling in a 2D Nonuniform Medium

Earth and Space Science, 2023
A 2D Cartesian simulation is presented and used to solve the ideal, low‐beta, linear magnetohydrodynamics equations. A simulation is used to investigate the propagation of Alfvén waves through inhomogeneities in Alfvén speed and density.
R. Davies, A. N. Wright
doaj   +1 more source

Torsional Alfvén waves: magneto-seismology in static and dynamic coronal plasmas [PDF]

, 2011
Aims: We study the properties of torsional Alfvén waves in coronal loops so that they may be exploited for coronal seismological applications. Methods: The governing equation is obtained for standing torsional Alfvén waves of a dynamic, gravitationally
Andries, Andries, Aschwanden, Aschwanden, Aschwanden, Banerjee, Bonet, De Moortel, Del Zanna, Dymova, Dymova, Dymova, Edwin, Erdelyi, Erdelyi, Erdélyi, Erdélyi, Erdélyi, Erdélyi, Erdélyi, Erdélyi, Erdélyi, Fedun, Goossens, Goossens, Heyvaerts, Jess, Klimchuk, M. S. Ruderman, Morton, Morton, Morton, Morton, Morton, Ofman, R. Erdélyi, R. J. Morton, Ruderman, Ruderman, Ruderman, Ruderman, Ruderman, Ruderman, Ruderman, Ruderman, Schrijver, Shelyag, Taroyan, Terradas, Terradas, Tomczyk, Tripathi, van Doorsselaere, Verth, Verth, Verth, Wang, Zaqarashvili, Zaqarashvili   +58 more
core   +1 more source

Phase Mixing of Propagating Alfvén Waves in a Single-fluid Partially Ionized Solar Plasma

The Astrophysical Journal, 2023
The phase mixing of Alfvén waves is one of the most promising mechanisms for the heating of the solar atmosphere. The damping of waves in this case requires small transversal scales, relative to the magnetic field direction; this requirement is achieved ...
M. McMurdo, I. Ballai, G. Verth, A. Alharbi, V. Fedun   +4 more
doaj   +1 more source

Phase Mixing of Alfvén Waves Near a 2D Magnetic Null Point [PDF]

, 2013
The propagation of linear Alfvén wave pulses in an inhomogeneous plasma near a 2D coronal null point is investigated. When a uniform plasma density is considered, it is seen that an initially planar Alfvén wavefront remains planar, despite the varying ...
AB Hassam, AW Hood, BN Dwivedi, D Banerjee, D Kumar, DI Pontin, DI Pontin, DW Longcope, E O’Shea, E O’Shea, GJJ Botha, IJ Craig, IJ Craig, IJD Craig, J Heyvaerts, J. A. McLaughlin, JA McLaughlin, JA McLaughlin, JA McLaughlin, JA McLaughlin, JA McLaughlin, JA McLaughlin, JA McLaughlin, JA McLaughlin, JO Thurgood, JO Thurgood, K Galsgaard, K Galsgaard, K Galsgaard, L Ofman, L Ofman, L Ofman, P Chmielewski, R Erdélyi, RA Harrison, RM Close, S Régnier, S Tomczyk, SV Bulanov   +38 more
core   +2 more sources