scholarly journals Analytic quasi-steady evolution of marginally unstable kinetic plasma instabilities in the presence of drag and scattering

2021 ◽  
Vol 28 (6) ◽  
pp. 062102
Author(s):  
J. B. Lestz ◽  
V. N. Duarte
Keyword(s):  
Plasma Instabilities

High contrast 2D visualization of edge plasma instabilities by ECE imaging

2012 ◽  
Vol 7 (01) ◽  
pp. C01024-C01024 ◽  
Author(s):  
G S Yun ◽  
M J Choi ◽  
W Lee ◽  
H K Park ◽  
C W Domier ◽  
...  
Keyword(s):  
Edge Plasma ◽  
Plasma Instabilities ◽  
High Contrast

Current-driven plasma instabilities at high latitudes

1975 ◽  
Vol 80 (16) ◽  
pp. 2030-2040 ◽  
Author(s):  
F. L. Scarf ◽  
R. W. Fredricks ◽  
C. T. Russell ◽  
M. Neugebauer ◽  
M. Kivelson ◽  
...  
Keyword(s):  
Plasma Instabilities ◽  
High Latitudes

Plasma instabilities driven by pickup ions of ring-beam velocity distributions in the outer heliosheath 

2021 ◽  
Author(s):  
Ameneh Mousavi ◽  
Kaijun Liu ◽  
Sina Sadeghzadeh
Keyword(s):  
Magnetic Field ◽  
Maximum Growth ◽  
Dispersion Analysis ◽  
Maximum Growth Rate ◽  
Injection Velocity ◽  
Plasma Instabilities ◽  
Pickup Ions ◽  
Beam Velocity ◽  
Background Magnetic Field ◽  
Hybrid Simulations

<p><span>The stability of the pickup ions in the outer heliosheath has been studied by many researchers because of its relevance to the energetic neutral atom (ENA) ribbon observed by the Interstellar Boundary EXplorer. However, previous studies are primarily limited to pickup ions of near </span><span>90° </span><span>pickup angles, the angle between the pickup ion injection velocity and the background, local interstellar magnetic field. Investigations on pickup ions of smaller pickup angles are still lacking. In this paper, linear kinetic dispersion analysis and hybrid simulations are carried out to examine the plasma instabilities driven by pickup ions of ring-beam velocity distributions at various pickup angles between zero and </span><span>90°</span><span>. </span><span>Parallel propagating waves are studied in the parameter regime where the parallel thermal spread of the pickup ions falls into the Alfvén cyclotron stability gap. </span><span>The linear analysis results and hybrid simulations both show that the fastest growing modes are the right-hand helicity waves propagating in the direction of the background magnetic field, and the maximum growth rate occurs at the pickup angle of </span><span>82°</span><span>. The simulation results further reveal that the saturation level of the fluctuating magnetic fields for pickup angles below </span><span>45° </span><span>is higher than that for pickup angles above </span><span>45°</span><span>. So, the scattering of pickup ions at near zero pickup angles is likely more pronounced than that at near </span><span>90° </span><span>pickup angles</span> .</p>

scholarly journals Plasma instabilities of a charge breeder ECRIS

2017 ◽  
Vol 26 (10) ◽  
pp. 105002 ◽  
Author(s):  
O Tarvainen ◽  
J Angot ◽  
I Izotov ◽  
V Skalyga ◽  
H Koivisto ◽  
...  
Keyword(s):  
Plasma Instabilities ◽  
Charge Breeder ◽  
A Charge

scholarly journals The equatorial E-region and its plasma instabilities: a tutorial

2009 ◽  
Vol 27 (4) ◽  
pp. 1509-1520 ◽  
Author(s):  
D. T. Farley
Keyword(s):  
Current System ◽  
Three Dimensional ◽  
Plasma Instabilities ◽  
Basic Physics ◽  
Electrojet Current ◽  
Fluid Theory ◽  
E Region ◽  
Kinetic Effects ◽  
The One ◽  
Observational Techniques

Abstract. In this short tutorial we first briefly review the basic physics of the E-region of the equatorial ionosphere, with emphasis on the strong electrojet current system that drives plasma instabilities and generates strong plasma waves that are easily detected by radars and rocket probes. We then discuss the instabilities themselves, both the theory and some examples of the observational data. These instabilities have now been studied for about half a century (!), beginning with the IGY, particularly at the Jicamarca Radio Observatory in Peru. The linear fluid theory of the important processes is now well understood, but there are still questions about some kinetic effects, not to mention the considerable amount of work to be done before we have a full quantitative understanding of the limiting nonlinear processes that determine the details of what we actually observe. As our observational techniques, especially the radar techniques, improve, we find some answers, but also more and more questions. One difficulty with studying natural phenomena, such as these instabilities, is that we cannot perform active cause-and-effect experiments; we are limited to the inputs and responses that nature provides. The one hope here is the steadily growing capability of numerical plasma simulations. If we can accurately simulate the relevant plasma physics, we can control the inputs and measure the responses in great detail. Unfortunately, the problem is inherently three-dimensional, and we still need somewhat more computer power than is currently available, although we have come a long way.

scholarly journals Wave Activity and Prominence Eruption

1998 ◽  
Vol 167 ◽  
pp. 314-317 ◽  
Author(s):  
F. Baudin ◽  
K. Bocchialini ◽  
C. Delannee ◽  
S. Koutchmy ◽  
G. Stellmacher ◽  
...  
Keyword(s):  
Dissipation Rate ◽  
Wave Activity ◽  
Observational Evidence ◽  
Loop System ◽  
Mhd Waves ◽  
Plasma Instabilities ◽  
Important Ingredient ◽  
X Ray ◽  
Convective Structures ◽  
Energy And Momentum

AbstractObservational evidence of 3 and 5 min vertical oscillations of a filament on the disk are recorded. Wave activity was observed before, during and after a filament disappearance, inside and around the filament. Both an Hα brightening and, later, a blowing out of a faint soft X-ray (Yohkoh) loop system occuring in connection with a flare were noticed. The wave activity seems to be a dynamically important ingredient of this erupting prominence.Propagating MHD waves and convective structures bring their energy and momentum from the photosphere towards the chromosphere up to the coronal heights where they are partially reflected and/or dissipated. The transition from the laminar to the turbulent state of the whole prominence enhances the dissipation rate of the external waves inside this system, adding energy to produce the heating and lifting of the plasma. Internal plasma instabilities could trigger this transition in the framework of a prominence disappearance.

Wave packet description of inhomogeneous plasma instabilities

1975 ◽  
Vol 15 (1) ◽  
pp. 103-124 ◽  
Author(s):  
Y.Y. Lau ◽  
R.J. Briggs
Keyword(s):  
Wave Packet ◽  
Inhomogeneous Plasma ◽  
Plasma Instabilities

Preliminary investigation on the use of low current pulsed power Z-pinch plasma devices for the study of early stage plasma instabilities

2017 ◽  
Vol 60 (1) ◽  
pp. 014031 ◽  
Author(s):  
E Kaselouris ◽  
V Dimitriou ◽  
I Fitilis ◽  
A Skoulakis ◽  
G Koundourakis ◽  
...  
Keyword(s):  
Early Stage ◽  
Preliminary Investigation ◽  
Pulsed Power ◽  
Plasma Instabilities ◽  
Pinch Plasma ◽  
Z Pinch
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