scholarly journals Higher Frequency Spectrum of a Diffuse Linear Pinch with Multiple Ion Species

1985 ◽  
Vol 38 (2) ◽  
pp. 143 ◽  
Author(s):  
WN-C Sy
Keyword(s):  
Magnetic Field ◽  
Cold Plasma ◽  
Cyclotron Frequency ◽  
Cutoff Frequency ◽  
Plasma Model ◽  
Frequency Effects ◽  
Soluble Model ◽  
Ion Cyclotron ◽  
Arbitrary Magnetic Field ◽  
Ion Species

A cold plasma model which takes into account finite ion cyclotron frequency effects and multiple ion species has been developed for wave propagation in arbitrary magnetic field geometries. This model has been used to derive an elegant system of normal mode equations for a 10w-fJ diffuse linear pinch. From a soluble model, general features of the spectrum are discussed up to and including the ion cyclotron range of frequencies. It is indicated that in the vicinity of the ion-ion hybrid cutoff frequency, there could exist global eigenmodes which might be useful for supplementary heating of diffuse linear pinches.

Finite-frequency surface waves on current sheets

1991 ◽  
Vol 45 (3) ◽  
pp. 389-406 ◽  
Author(s):  
K. P. Wessen ◽  
N. F. Cramer
Keyword(s):  
Magnetic Field ◽  
Dispersion Relation ◽  
Surface Waves ◽  
Cyclotron Frequency ◽  
Low Frequency ◽  
Dielectric Tensor ◽  
Magnetic Field Direction ◽  
Field Reversal ◽  
Ion Cyclotron ◽  
The Magnetic Field

The dispersion relation for low-frequency surface waves at a current sheet between two magnetized plasmas is derived using the cold-plasma dielectric tensor with finite ion-cyclotron frequency. The magnetic field direction is allowed to change discontinuously across the sheet, but the plasma density remains constant. The cyclotron frequency causes a splitting of the dispersion relation into a number of mode branches with frequencies both less than and greater than the ion-cyclotron frequency. The existence of these modes depends in particular upon the degree of magnetic field discontinuity and the direction of wave propagation in the sheet relative to the magnetic field directions. Sometimes two modes can exist for the same direction of propagation. The existence of modes undamped by Alfvén resonance absorption is predicted. Analytical solutions are obtained in the low-frequency and magnetic-field-reversal limits. The solutions are obtained numerically in the general case.

scholarly journals Origin of the turbulent spectra in the high-altitude cusp: Cluster spacecraft observations

2006 ◽  
Vol 24 (3) ◽  
pp. 1057-1075 ◽  
Author(s):  
K. Nykyri ◽  
B. Grison ◽  
P. J. Cargill ◽  
B. Lavraud ◽  
E. Lucek ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Altitude ◽  
Cyclotron Frequency ◽  
Break Point ◽  
Temporal Analysis ◽  
Spectral Break ◽  
Ion Cyclotron ◽  
Field Fluctuations ◽  
Spatio Temporal ◽  
Turbulent Spectra

Abstract. High-resolution magnetic field data from Cluster Flux Gate Magnetometer (FGM) and the Spatio-Temporal Analysis of Field Fluctuations (STAFF) instruments are used to study turbulent magnetic field fluctuations during the high-altitude cusp crossing on 17 March 2001. Despite the quiet solar wind conditions, the cusp was filled with magnetic field turbulence whose power correlates with the field-aligned ion plasma flux. The magnetic field wave spectra shows power law behavior with both double and single slopes with break in the spectra usually occurring in the vicinity of the local ion cyclotron frequency. Strong peaks in the wave power close to local ion cyclotron frequency were sometimes observed, with secondary peaks at higher harmonics indicative of resonant processes between protons and the waves. We show that the observed spectral break point may be caused partly by damping of obliquely propagating kinetic Alfvén (KAW) waves and partly by cyclotron damping of ion cyclotron waves.

Parallel solitary Alfvén waves in warm multi-species beam-plasma systems. Part 1

1992 ◽  
Vol 47 (1) ◽  
pp. 15-24 ◽  
Author(s):  
Frank Verheest ◽  
B. Buti
Keyword(s):  
Magnetic Field ◽  
Perturbation Analysis ◽  
Cold Plasma ◽  
Soliton Solutions ◽  
Magnetohydrodynamic Waves ◽  
Beam Plasma ◽  
Self Consistent ◽  
Reductive Perturbation ◽  
Derivative Nonlinear Schrödinger Equation ◽  
Ion Species

A self-consistent reductive perturbation analysis for parallel-propagating magnetohydrodynamic waves in warm multi-species plasmas, in which different constituents can have differing equilibrium drifts, leads to a derivative nonlinear Schrödinger equation for the wave magnetic field. Soliton solutions are discussed, including applications to plasmas with two ion species. Such solitons are larger (in amplitude) and wider than in the non-streaming and/or cold-plasma case, other parameters being equal.

Comment on ‘Electron acoustic super solitary waves in a magnetized plasma’, J. Plasma Phys. 84, 905840406 (2018)

2019 ◽  
Vol 85 (1) ◽  
Author(s):  
Frank Verheest ◽  
Manfred A. Hellberg
Keyword(s):  
Magnetic Field ◽  
Solitary Waves ◽  
Static Magnetic Field ◽  
Plasma Phys ◽  
Magnetized Plasma ◽  
Magnetized Plasmas ◽  
Plasma Model ◽  
Electron Acoustic ◽  
Nonlinear Solitary Waves ◽  
Ion Species

The plasma model used in a recent paper by Kamalam et al. (J. Plasma Phys., vol. 84, 2018, 905840406) assumes a Boltzmann description for two hot ion species, in the presence of two adiabatic (fluid) electron species, for the study of obliquely propagating acoustic-type nonlinear solitary waves with respect to a static magnetic field. We argue that the assumption of Boltzmann distributions for the hot ions is incorrect, thus invalidating their conclusions, in particular about the possible occurrence of supersolitons in magnetized plasmas.

scholarly journals Dispersion curves for the generalized Bernstein modes

1973 ◽  
Vol 9 (1) ◽  
pp. 89-100 ◽  
Author(s):  
S. Puri ◽  
F. Leuterer ◽  
M. Tutter
Keyword(s):  
Magnetic Field ◽  
Exact Solution ◽  
Cold Plasma ◽  
Dispersion Curves ◽  
Harmonic Waves ◽  
Plasma Model ◽  
Maxwellian Plasma ◽  
Cyclotron Harmonics ◽  
Shrinking Regions ◽  
Cyclotron Harmonic

Dispersion curves are plotted for the extraordinary branch of the electron- and ion-cyclotron harmonic waves propagating perpendicularly to the static magnetic field in a non-relativistic, hot Maxwellian plasma, without invoking the electrostatic approximation. It is found that, except in the vicinity of the cyclotron harmonics and the hybrid resonances, either the cold-plasma or the electrostatic approximation are accurate representations of the exact solution. The hybrid resonances of the cold-plasma model become monotonically shrinking regions of low group velocity as the temperature is increased, till all discernible evidence of these resonances disappears as the parameters corresponding to the thermonuclear plasmas are approached.

scholarly journals Compressional Alfvén Wave Propagation Below Ion Cyclotron Frequency

1968 ◽  
Vol 21 (2) ◽  
pp. 129 ◽  
Author(s):  
RC Cross ◽  
JA Lehane
Keyword(s):  
Wave Propagation ◽  
Cyclotron Resonance ◽  
Cyclotron Frequency ◽  
Cutoff Frequency ◽  
Compressional Wave ◽  
Alfven Wave ◽  
Alfvén Waves ◽  
Ion Cyclotron Resonance ◽  
Wave Measurements ◽  
Ion Cyclotron

When the compressional wave cutoff frequency is below ion cyclotron frequency both compressional and torsional Alfven waves may be present simultaneously. Oompressional wave measurements in this regime are particularly important because of their relevance to certain ion cyclotron resonance heating experiments. This paper extends the work of others in this important regime.

scholarly journals Polarization properties of Gendrin mode waves observed in the Earth's magnetosphere: observations and theory

2009 ◽  
Vol 27 (12) ◽  
pp. 4429-4433 ◽  
Author(s):  
O. P. Verkhoglyadova ◽  
B. T. Tsurutani
Keyword(s):  
Magnetic Field ◽  
Wave Propagation ◽  
Electromagnetic Wave ◽  
Excellent Agreement ◽  
Cold Plasma ◽  
Outer Zone ◽  
Plasma Model ◽  
Circularly Polarized ◽  
Ambient Magnetic Field ◽  
Measured Angle

Abstract. We show a case of an outer zone magnetospheric electromagnetic wave propagating at the Gendrin angle, within uncertainty of the measurements. The chorus event occurred in a "minimum B pocket". For the illustrated example, the measured angle of wave propagation relative to the ambient magnetic field θkB was 58°±4°. For this event the theoretical Gendrin angle was 62°. Cold plasma model is used to demonstrate that Gendrin mode waves are right-hand circularly polarized, in excellent agreement with the observations.

Non-linear scattering of electromagnetic waves near the ion cyclotron frequency in an inhomogeneous plasma

1968 ◽  
Vol 2 (3) ◽  
pp. 353-363 ◽  
Author(s):  
J. Teichmann
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Waves ◽  
Cyclotron Frequency ◽  
Inhomogeneous Plasma ◽  
Landau Damping ◽  
Left Hand ◽  
Right Hand ◽  
Non Linear ◽  
Ion Cyclotron ◽  
The Magnetic Field

The non-linear induced scattering by plasma particles of right-hand and left- hand polarized electromagnetic waves propagating along the magnetic field, is studied. The non-linear Landau damping for frequencies near the ion cyclotron frequency in a weak turbulent inhomogeneous plasma is determined.

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