Absorption and emission of plasma waves in mode conversion layers at general harmonics of the ion cyclotron frequency

1990 ◽  
Vol 2 (11) ◽  
pp. 2693-2703 ◽  
Author(s):  
Suwon Cho ◽  
D. G. Swanson
Keyword(s):  
Cyclotron Frequency ◽  
Mode Conversion ◽  
Plasma Waves ◽  
Absorption And Emission ◽  
Ion Cyclotron

Observation of Ion-Cyclotron-Frequency Mode-Conversion Flow Drive in Tokamak Plasmas

2008 ◽  
Vol 101 (23) ◽  
Author(s):  
Y. Lin ◽  
J. E. Rice ◽  
S. J. Wukitch ◽  
M. J. Greenwald ◽  
A. E. Hubbard ◽  
...  
Keyword(s):  
Cyclotron Frequency ◽  
Mode Conversion ◽  
Frequency Mode ◽  
Tokamak Plasmas ◽  
Ion Cyclotron

Observation of ion-cyclotron-frequency mode conversion plasma rotation on HT-7

2012 ◽  
Vol 54 (3) ◽  
pp. 035005 ◽  
Author(s):  
W Y Zhang ◽  
Y D Li ◽  
X J Zhang ◽  
T Lan ◽  
X Gao ◽  
...  
Keyword(s):  
Cyclotron Frequency ◽  
Mode Conversion ◽  
Frequency Mode ◽  
Plasma Rotation ◽  
Ion Cyclotron

scholarly journals Plasma waves above the ion cyclotron frequency in the solar wind: a review on observations

2009 ◽  
Vol 16 (2) ◽  
pp. 319-329 ◽  
Author(s):  
C. Briand
Keyword(s):  
Solar Wind ◽  
Cyclotron Frequency ◽  
Plasma Frequency ◽  
Interplanetary Medium ◽  
Plasma Waves ◽  
Hydrodynamic Models ◽  
Ion Cyclotron ◽  
Earth’S Bow Shock ◽  
Kinetic Effects ◽  
The Waves

Abstract. Since the very beginning of the space venture, discrepancies between hydrodynamic models and observations have raised the attention to the kinetic effects taking place in the interplanetary medium. After discussing some of these constraints, a review on the state of the art knowledge on the waves in the range fci<f<fpe (fci – about 10−1 Hz – is the ion cyclotron frequency, and fpe – a few 10 kHz – the electron plasma frequency) observed in the free solar wind, i.e., not magnetically connected to the Earth's bow shock, is addressed.

scholarly journals A mode filter for plasma waves in the Hall-MHD approximation

1999 ◽  
Vol 17 (6) ◽  
pp. 712-722 ◽  
Author(s):  
C. Vocks ◽  
U. Motschmann ◽  
K.-H. Glassmeier
Keyword(s):  
Cyclotron Frequency ◽  
Plasma Waves ◽  
Mhd Equations ◽  
Mhd Waves ◽  
Filter Method ◽  
Low Frequencies ◽  
Spectral Density Matrix ◽  
Ion Cyclotron ◽  
Hall Mhd ◽  
Wave Modes

Abstract. A filter method is presented which allows a qualitative and quantitative identification of wave modes observed with plasma experiments on satellites. Hitherto existing mode filters are based on the MHD theory and thus they are restricted to low frequencies well below the ion cyclotron frequency. The present method is generalized to cover wave modes up to the characteristic ion frequencies. The spectral density matrix determined by the observations is decomposed using the eigenvectors of the linearized Hall-MHD equations. As the wave modes are dispersive in this formalism, a precise determination of the k->-vectors requires the use of multi-point measurements. Therefore the method is particularly relevant to multi-satellite missions. The method is tested using simulated plasma data. The Hall-MHD filter is able to identify the modes excited in the model plasma and to assign the correct energetic contributions. By comparison with the former method it is shown that the simple MHD filter leads to large errors if the frequency is not well below the ion cyclotron frequency. Further the range of validity of the linear theory is examined rising the simulated wave amplitudes.Key words. Magnetospheric physics (MHD waves and instabilities; plasma waves and instabilities)

scholarly journals Kinetic structure and wave properties associated with sharp dipolarization front observed by Cluster

2012 ◽  
Vol 30 (1) ◽  
pp. 97-107 ◽  
Author(s):  
S. Y. Huang ◽  
M. Zhou ◽  
X. H. Deng ◽  
Z. G. Yuan ◽  
Y. Pang ◽  
...  
Keyword(s):  
Kinetic Energy ◽  
Cyclotron Frequency ◽  
Energetic Electron ◽  
Plasma Waves ◽  
Temperature Anisotropy ◽  
Whistler Waves ◽  
Dipolarization Front ◽  
The Earth ◽  
Ion Cyclotron ◽  
Wave Properties

Abstract. Multiple dipolarization fronts (DFs) were observed by Cluster spacecraft in the magnetotail during a substorm. These DFs were kinetic structures, embedded in the bursty plasma flow, and moved earthward (mainly) and dawnward. Intense electric field, parallel and perpendicular currents were detected in the DF layer. These front layers were energy dissipation region (load region) where the energy of electromagnetic fields were transferred to the plasma thermal and kinetic energy. This dissipation was dominated by electrons. There were enhancements of plasma waves around the DF region: wavelet results show that wave activities around the ion cyclotron frequency in the front layer were generated by Alfvén ion cyclotron instability; whistler waves were also detected before, during and after the DFs, which are triggered by electron temperature anisotropy and coincident with enhancement of energetic electron fluxes. The observation of these waves could be important for the understanding of evolution of DF and electron energization during the substorm. We discuss the generation mechanism of the DFs and suggest that these DFs were generated in the process of transient reconnection, and then traveled toward the Earth.

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