scholarly journals Two-dimensional hybrid MHD-kinetic electron simulations of an Alfvén wave pulse

2005 ◽  
Vol 110 (A1) ◽  
Author(s):  
P. A. Damiano
Keyword(s):  
Alfven Wave ◽  
Two Dimensional ◽  
Wave Pulse

On the motion of thin airfoils in fluids of finite electrical conductivity

1960 ◽  
Vol 7 (3) ◽  
pp. 449-468 ◽  
Author(s):  
James E. McCune
Keyword(s):  
Reynolds Number ◽  
Flow Field ◽  
Steady Motion ◽  
Magnetic Reynolds Number ◽  
Alfven Wave ◽  
Deep Penetration ◽  
Two Dimensional ◽  
A Value ◽  
Finite Electrical Conductivity ◽  
Field Geometry

A two-dimensional, small-perturbation theory for the steady motion of thin lifting airfoils in an incompressible conducting fluid, with the uniform applied magnetic field perpendicular to (and in the plane of) the undisturbed, uniform flow field, is described. The conductivity of the fluid is assumed to be such that the magnetic Reynolds number,Rm, of the flow is large but finite. Within this assumption, a theory based on superposition of sinusoidal modes is constructed and applied to some simple thin airfoil problems.It is shown that with this particular field geometry the Alfvén wave mechanism is important in making possible very deep penetration into the flow field of currents and their associated vorticity. It is also shown that the current penetration for an airfoil is much larger than for a wavy wall of wavelength equal to the airfoil chord.A value ofRm= 5 is found to be a good approximation to infinity in this study; in fact, use of the present technique for values ofRmof the order of unity is permissible. These results provide an indication of what is meant by ‘large’ magnetic Reynolds number in two-dimensional magneto-aerodynamics.

Re-ionization of a partially ionized plasma by an Alfvén wave of moderate amplitude

1980 ◽  
Vol 24 (1) ◽  
pp. 65-74
Author(s):  
M. H. Brennan ◽  
M. L. Sawley
Keyword(s):  
Plasma Temperature ◽  
Torsional Wave ◽  
Alfven Wave ◽  
Helium Plasma ◽  
Acoustic Oscillations ◽  
Radial Density ◽  
Helium Ions ◽  
Wave Pulse ◽  
Partially Ionized ◽  
Doubly Charged

This paper reports on the use of forced magneto-acoustic oscillations to investigate the effect of a torsional hydromagnetic (Alfvén) wave pulse of moderate amplitude on the properties of a partially ionized afterglow helium plasma. Observations of the magnetic flux associated with the oscillations, measured at a number of frequencies, are used to determine radial density proffles and to provide estimates of plasma temperature. The torsional wave is shown to cause significant re-ionization of the plasma with no corresponding increase in the plasma temperature. The torsional wave is shown to cause significant re-ionization of the plasma with no corresponding increase in the plasma temperature. However, the presence of a number of energetic particles is evidenced by the production of a significant number of doubly charged helium ions.

Alfvén wave phase mixing driven by velocity shear in two-dimensional open magnetic configurations

1999 ◽  
Vol 104 (A8) ◽  
pp. 17057-17068 ◽  
Author(s):  
M. S. Ruderman ◽  
M. L. Goldstein ◽  
D. A. Roberts ◽  
A. Deane ◽  
L. Ofman
Keyword(s):  
Velocity Shear ◽  
Alfven Wave ◽  
Two Dimensional ◽  
Phase Mixing ◽  
Wave Phase
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