Role of Trapped Particles in Plasma Waves and Instabilities

1972 ◽  
Vol 15 (11) ◽  
pp. 2001 ◽  
Author(s):  
B. Rosen
Keyword(s):  
Plasma Waves ◽  
Trapped Particles ◽  
Plasma Waves And Instabilities

scholarly journals Cometary Plasma Waves and Instabilities

1991 ◽  
Vol 116 (2) ◽  
pp. 1171-1210 ◽  
Author(s):  
Bruce T. Tsurutani
Keyword(s):  
Nonlinear Wave ◽  
Nonlinear Waves ◽  
Plasma Waves ◽  
Particle Interactions ◽  
Wave Evolution ◽  
Cometary Plasma ◽  
Plasma Waves And Instabilities ◽  
Wave Particle Interactions

AbstractThis review will discuss various plasma waves and instabilities that have been observed near comets. Comments on nonlinear wave evolution and wave cascading, as well as the role of nonlinear waves in wave-particle interactions, will be made.

Controlling coherent and incoherent plasma emissions: the role of electron plasma waves

2004 ◽  
Vol 78 (7-8) ◽  
pp. 923-926
Author(s):  
A.S. Sandhu ◽  
S. Narayanan ◽  
G.R. Kumar
Keyword(s):  
Plasma Waves ◽  
Electron Plasma

Role of trapped and circulating particles in inducing current drive and radial electric field by Alfvén waves in tokamaks

2002 ◽  
Vol 67 (5) ◽  
pp. 301-308 ◽  
Author(s):  
V. S. TSYPIN ◽  
R. M. O. GALVÃO ◽  
I. C. NASCIMENTO ◽  
M. TENDLER ◽  
J. H. F. SEVERO ◽  
...  
Keyword(s):  
Electric Field ◽  
Radial Electric Field ◽  
Alfven Waves ◽  
Current Drive ◽  
Alfvén Waves ◽  
Trapped Particles ◽  
Transport Barriers

Absorption by trapped particles is supposed to seriously hinder current drive by Alfvén waves. However, it is shown in this paper that the same effect is rather beneficial for the emergence of the radial electric field induced by these waves, which is important for creating and maintaining transport barriers in tokamaks.

scholarly journals Nongyrotropic particle distributions in space plasmas

1999 ◽  
Vol 17 (5) ◽  
pp. 613-622 ◽  
Author(s):  
U. Motschmann ◽  
K. H. Glassmeier ◽  
A. L. Brinca
Keyword(s):  
Inhomogeneous Plasma ◽  
Plasma Waves ◽  
Distribution Functions ◽  
Unstable Wave ◽  
Gyration Radius ◽  
Linear Dispersion ◽  
Ionosphere Plasma ◽  
Plasma Waves And Instabilities ◽  
Background Magnetic Field ◽  
Interplanetary Physics

Abstract. In nonstationary, strong inhomogeneous or open plasmas particle orbits are rather complicated. If the nonstationary time scale is smaller than the gyration period, if the inhomogeneity scale is smaller than the gyration radius, i.e. at magnetic plasma boundaries, or if the plasma has sources and sinks in phase space, then nongyrotropic distribution functions occur. The stability of such plasma configurations is studied in the framework of linear dispersion theory. In an open plasma nongyrotropy drives unstable waves parallel and perpendicular to the background magnetic field, whereas in the gyrotropic limit the plasma is stable. In nonstationary plasmas nongyrotropy drives perpendicular unstable waves only. Temporal modulation couples a seed mode with its side lobes and thus it renders unstable wave growth more difficult. As an example of an inhomogeneous plasma a magnetic halfspace is discussed. In a layer with thickness of the thermal proton gyroradius a nongyrotropic distribution is formed which may excite unstable parallel and perpendicular propagating waves.Key words. Interplanetary physics (plasma waves and turbulence) · Ionosphere (plasma waves and instabilities) · Magnetospheric physics (plasma waves and instabilities)

scholarly journals Plasma Waves in the Inner Magnetosphere

2021 ◽  
pp. 85-119
Author(s):  
Hannu E. J. Koskinen ◽  
Emilia K. J. Kilpua
Keyword(s):  
Radiation Belt ◽  
Low Frequency ◽  
Plasma Waves ◽  
Mhd Waves ◽  
Particle Interactions ◽  
Inner Magnetosphere ◽  
Very Low Frequency ◽  
Link Type ◽  
Wave Modes

AbstractUnderstanding the role of plasma waves, extending from magnetohydrodynamic (MHD) waves at ultra-low-frequency (ULF) oscillations in the millihertz range to very-low-frequency (VLF) whistler-mode emissions at frequencies of a few kHz, is necessary in studies of sources and losses of radiation belt particles. In order to make this theoretically heavy part of the book accessible to a reader, who is not familiar with wave–particle interactions, we have divided the treatise into three chapters. In the present chapter we introduce the most important wave modes that are critical to the dynamics of radiation belts. The drivers of these waves are discussed in Chap. 10.1007/978-3-030-82167-8_5 and the roles of the wave modes as sources and losses of radiation belt particles are dealt with in Chap. 10.1007/978-3-030-82167-8_6.

scholarly journals Nonstationary pearl pulsations as a signature of magnetospheric disturbances

2000 ◽  
Vol 18 (5) ◽  
pp. 517-522 ◽  
Author(s):  
F. Z. Feygin ◽  
N. G. Kleimenova ◽  
O. A. Pokhotelov ◽  
M. Parrot ◽  
K. Prikner ◽  
...  
Keyword(s):  
Electric Field ◽  
Plasma Waves ◽  
Magnetic Activity ◽  
Magnetospheric Physics ◽  
Central Frequency ◽  
Plasma Waves And Instabilities ◽  
Magnetospheric Configuration And Dynamics ◽  
Diurnal Distribution ◽  
Magnetospheric Configuration

Abstract. We analyse long-lasting (several hours) Pc1 pearl pulsations with decreasing, increasing or constant central frequencies. We show that nonstationary pearl events (those with either decreasing or increasing central frequency) are observed simultaneously with increasing auroral magnetic activity at the nightside magnetosphere while the stationary events (constant central frequency) correspond to quiet magnetic conditions. Events with decreasing central frequency are observed mostly in the late morning and daytime whereas events with increasing central frequency appear either early in the morning or in the afternoon. We explain the diurnal distribution of the nonstationary pearl pulsations in terms of proton drifts depending on magnetic activity, and evaluate the magnetospheric electric field based on the variation of the central frequency of pearl pulsations.Key words: Magnetospheric physics (magnetospheric configuration and dynamics; plasma waves and instabilities)

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