Observation and model of an ellipsoidally symmetric velocity space distribution in a weakly-coupled dusty plasma

2011 ◽  
Vol 18 (11) ◽  
pp. 113701 ◽  
Author(s):  
Ross Fisher ◽  
Edward Thomas
Keyword(s):  
Dusty Plasma ◽  
Velocity Space ◽  
Space Distribution ◽  
Weakly Coupled

Weakly Coupled Dusty Plasma With a High Dust Temperature and Low Thermal Energy Density

2013 ◽  
Vol 41 (4) ◽  
pp. 784-787 ◽  
Author(s):  
Ross Fisher ◽  
Edward Thomas
Keyword(s):  
Energy Density ◽  
Dusty Plasma ◽  
Thermal Energy ◽  
Random Motion ◽  
The Other ◽  
Space Distribution ◽  
Weakly Coupled ◽  
Plasma Species ◽  
Dust Component ◽  
Area Of Concern

Relatively large values of the temperature for the dust component of plasma systems are an area of concern in the understanding of such systems. Dust temperatures are regularly observed to be several orders of magnitude higher than the temperatures of the other plasma components, leading to questions of the validity of the measurements. In order to address such concerns, the phase space distribution was measured for a weakly coupled dusty plasma system. The measurements are used to illustrate the differences between two metrics of the thermal motion of the dust component, namely, the temperature and the thermal energy density. It is shown that, by considering the thermal energy density, instead of the temperature, the energy associated with the random motion of the dust component is comparable to that of the other plasma species.

Measurement of the kinetic dust temperature of a weakly coupled dusty plasma

2007 ◽  
Vol 14 (6) ◽  
pp. 063702 ◽  
Author(s):  
Jeremiah D. Williams ◽  
Edward Thomas
Keyword(s):  
Dusty Plasma ◽  
Dust Temperature ◽  
Weakly Coupled

Peculiarities of dusty plasma space distribution in traps

2009 ◽  
Vol 42 (21) ◽  
pp. 214028
Author(s):  
S A Trigger ◽  
G J F van Heijst ◽  
O F Petrov ◽  
P P J M Schram ◽  
Yu P Vlasov
Keyword(s):  
Dusty Plasma ◽  
Space Distribution

scholarly journals A universal mirror wave-mode threshold condition for non-thermal space plasma environments

2002 ◽  
Vol 9 (2) ◽  
pp. 75-78 ◽  
Author(s):  
M. P. Leubner ◽  
N. Schupfer
Keyword(s):  
Wave Mode ◽  
Instability Threshold ◽  
Velocity Space ◽  
Space Distribution ◽  
Instability Criterion ◽  
Threshold Condition ◽  
Magnetic Fluctuations ◽  
Plasma Parameters ◽  
Energy Principle ◽  
Loss Cone

Abstract. Magnetic fluctuations are recognized in a large variety of space plasmas by increasingly high resolution, in situ observations as mirror wave mode structures. A typical requirement for the excitation of mirror modes is a dominant perpendicular pressure in a high-beta plasma environment. Contrary, we demonstrate from a realistic kinetic analysis how details of the velocity space distributions are of considerable significance for the instability threshold. Introducing the most common characteristics of observed ion and electron distributions by a mixed suprathermal-loss-cone, we derive a universal mirror instability criterion from an energy principle for collisionless plasmas. As a result, the transition from two temperature Maxwellians to realistic non-thermal features provides a strong source for the generation of mirror wave mode activity, reducing drastically the instability threshold. In particular, a number of space-related examples illuminate how the specific structure of the velocity space distribution dominates as a regulating excitation mechanism over the effects related to changes in the plasma parameters.

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