Mode conversion between Alfvén wave eigenmodes in axially inhomogeneous two‐ion‐species plasmas

1990 ◽  
Vol 2 (4) ◽  
pp. 787-796 ◽  
Author(s):  
D. R. Roberts ◽  
N. Hershkowitz ◽  
J. A. Tataronis
Keyword(s):  
Mode Conversion ◽  
Alfven Wave ◽  
Ion Species

scholarly journals Alfvén resonance absorption in electron-positron plasmas

2010 ◽  
Vol 6 (S274) ◽  
pp. 224-227 ◽  
Author(s):  
N. F. Cramer
Keyword(s):  
Mode Conversion ◽  
Alfven Wave ◽  
Pulsar Magnetosphere ◽  
Pulsar Radio ◽  
Inertial Alfvén Wave ◽  
Pair Plasma ◽  
Electron Positron ◽  
Normal Electron ◽  
The Magnetic Field ◽  
Pulsar Radio Emission

AbstractWaves propagating obliquely in a magnetized cold pair plasma experience an approximate resonance in the wavevector component perpendicular to the magnetic field, which is the analogue of the Alfvén resonance in normal electron-ion plasmas. Wave absorption at the resonance can take place via mode conversion to the analogue of the short wavelength inertial Alfvén wave. The Alfvén resonance could play a role in wave propagation in the pulsar magnetosphere leading to pulsar radio emission. Ducting of waves in strong plasma gradients may occur in the pulsar magnetosphere, which leads to the consideration of Alfvén surface waves, whose energy is concentrated in the region of strong gradients.

Modification of Alfvén wave dispersion and Alfvén wave heating in multiple ion species tokamak plasmas

1997 ◽  
Vol 39 (10) ◽  
pp. 1551-1560 ◽  
Author(s):  
A G Elfimov ◽  
R M O Galvão ◽  
I C Nascimento ◽  
G Amarante-Segundo
Keyword(s):  
Wave Dispersion ◽  
Alfven Wave ◽  
Tokamak Plasmas ◽  
Wave Heating ◽  
Ion Species

Mode conversion and electron damping of the fast Alfvén wave in a tokamak at the ion–ion hybrid frequency

1995 ◽  
Vol 2 (5) ◽  
pp. 1637-1647 ◽  
Author(s):  
V. Fuchs ◽  
A. K. Ram ◽  
S. D. Schultz ◽  
A. Bers ◽  
C. N. Lashmore‐Davies
Keyword(s):  
Mode Conversion ◽  
Alfven Wave ◽  
Hybrid Frequency

scholarly journals ICRF mode conversion in three-ion species heating experiment and in flow drive experiment on the Alcator C-Mod tokamak

2017 ◽  
Vol 157 ◽  
pp. 03030
Author(s):  
Y. Lin ◽  
S.J. Wukitch ◽  
E. Edlund ◽  
P. Ennever ◽  
A. E. Hubbard ◽  
...  
Keyword(s):  
Mode Conversion ◽  
Ion Species

scholarly journals Evolution of Alfvén wave-driven solar winds to red giants

2007 ◽  
Vol 3 (S247) ◽  
pp. 201-207
Author(s):  
Takeru K. Suzuki
Keyword(s):  
Solar Wind ◽  
Mode Conversion ◽  
Alfven Waves ◽  
Alfven Wave ◽  
Alfvén Waves ◽  
Stellar Winds ◽  
Red Giants ◽  
Giant Stars ◽  
Solar Winds ◽  
Red Giant

AbstractIn this talk we introduce our recent results of global 1D MHD simulations for the acceleration of solar and stellar winds. We impose transverse photospheric motions corresponding to the granulations, which generate outgoing Alfvén waves. The Alfvén waves effectively dissipate by 3-wave coupling and direct mode conversion to compressive waves in density-stratified atmosphere. We show that the coronal heating and the solar wind acceleration in the open magnetic field regions are natural consequence of the footpoint fluctuations of the magnetic fields at the surface (photosphere). We also discuss winds from red giant stars driven by Alfvén waves, focusing on different aspects from the solar wind. We show that red giants wind are highly structured with intermittent magnetized hot bubbles embedded in cool chromospheric material.

Resonant mode conversion of a shear Alfvén wave

1987 ◽  
Vol 65 (4) ◽  
pp. 357-358
Author(s):  
Bhimsen K. Shivamoggi
Keyword(s):  
Solar Wind ◽  
Acoustic Wave ◽  
Wave Energy ◽  
Mode Conversion ◽  
Resonant Absorption ◽  
Resonant Mode ◽  
Alfven Wave ◽  
Ion Acoustic Wave ◽  
Ion Acoustic ◽  
Kinetic Alfven Wave

A new mechanism for the resonant absorption of a shear Alfvén wave is proposed that involves a direct mode conversion of the latter to an ion-acoustic wave without bringing in the intermediary — the kinetic Alfvén wave. The fraction of the incident Alfvén-wave energy that is mode-converted to an ion-acoustic wave is calculated. This mechanism likely operates in the solar wind, where it might lead to heating of the plasma.

Electron-acoustic and ion-ion hybrid resonance-drift instability in inhomogeneous multi-ion-species magnetoplasmas

1984 ◽  
Vol 32 (2) ◽  
pp. 255-261 ◽  
Author(s):  
Shefali S. Dash ◽  
A. S. Sharma ◽  
B. Buti
Keyword(s):  
Magnetic Field ◽  
Wave Propagation ◽  
Mode Conversion ◽  
Density Gradients ◽  
Hybrid Resonance ◽  
Electron Acoustic ◽  
Drift Instability ◽  
Ion Species ◽  
The Magnetic Field

Electron-acoustic (EA) and ion-ion-hybrid resonance (IIHR) waves, in a multi-ion-species magnetoplasma with density gradients perpendicular to the magnetic field and the direction of wave propagation are found to be drift unstable provided the inhomogeneities exceed a certain threshold. The possibility of mode conversion between the EA and the IIHR waves is examined.

scholarly journals Collisionless Damping of Fast and Ion?Cyclotron Surface Waves

1993 ◽  
Vol 46 (2) ◽  
pp. 271 ◽  
Author(s):  
GW Rowe
Keyword(s):  
Surface Waves ◽  
Short Wavelength ◽  
Mode Conversion ◽  
Low Frequency ◽  
Wave Mode ◽  
Alfven Wave ◽  
Field Boundary ◽  
First Order ◽  
Vacuum Interface ◽  
Ion Cyclotron

A recently developed general kinetic theory of surface waves is used to calculate the collisionless damping of low frequency fast and ion-cyclotron surface waves on a magnetised plasma-vacuum interface. In particular, the possibility of Cherenkov (Landau and transit-time magnetic) absorption by electrons is accounted for, assuming a bi-Maxwellian distribution of electrons in velocity space. It is shown that in general the surface waves are damped via mode conversion to a short-wavelength mode, such as the kinetic Alfven wave, which is subsequently Landau absorbed within the plasma. For high temperatures this short-wavelength mode can also be radiated into the plasma without being completely absorbed. It is also shown that the related ion-sound surface wave mode and instability identified by Alexandrov et al. (1984) are unphysical, and are the result of neglecting the gas pressure in the first-order magnetic field boundary condition.

scholarly journals Alfvén Wave Mode Conversion in Pulsar Magnetospheres

2021 ◽  
Vol 908 (2) ◽  
pp. 176
Author(s):  
Yajie Yuan ◽  
Yuri Levin ◽  
Ashley Bransgrove ◽  
Alexander Philippov
Keyword(s):  
Mode Conversion ◽  
Wave Mode ◽  
Alfven Wave
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