Test particle acceleration by small amplitude electromagnetic waves in a uniform magnetic field

1990 ◽  
Vol 2 (4) ◽  
pp. 700-714 ◽  
Author(s):  
Gregory P. Ginet ◽  
Michael A. Heinemann
Keyword(s):  
Magnetic Field ◽  
Particle Acceleration ◽  
Test Particle ◽  
Electromagnetic Waves ◽  
Small Amplitude ◽  
Uniform Magnetic Field

Propagation of electromagnetic waves normal to a magnetic field in a uniform anisotropic Maxwellian plasma

1968 ◽  
Vol 2 (4) ◽  
pp. 591-595
Author(s):  
P. Stewart
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Waves ◽  
Uniform Magnetic Field ◽  
Hypergeometric Functions ◽  
Dispersion Relations ◽  
Second Order ◽  
Anisotropic Plasma ◽  
Maxwellian Plasma

Closed forms are found for the dispersion relations describing the propagation through a uniform anisotropic plasma of the three modes of electromagnetic waves whose wave vectors are perpendicular to a steady and uniform magnetic field. Such relations are found to be conveniently expressed in terms of hypergeometric functions of the second order.

Cross-field plasma acceleration and potential formation induced by electromagnetic waves in a magnetized plasma

2001 ◽  
Vol 66 (3) ◽  
pp. 143-155 ◽  
Author(s):  
R. SUGAYA
Keyword(s):  
Magnetic Field ◽  
Particle Acceleration ◽  
Electric Field ◽  
Electromagnetic Waves ◽  
Collisionless Plasma ◽  
Magnetized Plasma ◽  
Propagating Waves ◽  
Potential Formation ◽  
Dynamo Effect ◽  
The Magnetic Field

A single-particle theory is developed to investigate particle acceleration along and across a magnetic field and the generation of an electric field transverse to the magnetic field induced by electromagnetic waves in a magnetized plasma. The almost perpendicularly propagating waves accelerate particles via their Landau and cyclotron damping, and the ratio of parallel and perpendicular drift velocities vs∥/vd can be proved to be proportional to k∥/k⊥. Simultaneously, an intense cross-field electric field E0 = B0×vd/c is generated via the dynamo effect owing to perpendicular particle acceleration to satisfy the generalized Ohm’s law. This means that this cross-field particle drift in a collisionless plasma is identical to E×B drift. It is verified that the transport equations obtained are exactly equivalent to those derived from the θ-dependent quasilinear velocity-space diffusion equation obtained from the Vlasov–Maxwell equations.

scholarly journals Magnetic Field Reconnection in Differentially Rotating Accretion Disks

1985 ◽  
Vol 107 ◽  
pp. 477-482
Author(s):  
David Gilden ◽  
T. Tajima
Keyword(s):  
Magnetic Field ◽  
Accretion Disks ◽  
Hot Spots ◽  
Small Amplitude ◽  
Uniform Magnetic Field ◽  
Cataclysmic Variables ◽  
Dwarf Novae ◽  
The Magnetic Field ◽  
Viscous Stresses ◽  
Fast Reconnection

Differentially rotating accretion disks threaded by a uniform magnetic field have been numerically simulated. Fast reconnection followed by coalescence allows the magnetic field to drive small amplitude radial oscillations in the disk. These oscillations may be observable as the viscous stresses cause the disk to brighten and fade as the disk expands and contracts. Episodes of reconnection may also be observable as hot spots produced locally at the sites of coalescence. Cataclysmic variables, and in particular dwarf novae, provide a natural interpretation for these calculations.

PROPAGATION OF ELECTROMAGNETIC WAVES ALONG A THIN PLASMA SHEET

1960 ◽  
Vol 38 (12) ◽  
pp. 1586-1594 ◽  
Author(s):  
James R. Wait
Keyword(s):  
Magnetic Field ◽  
Surface Wave ◽  
Plasma Sheet ◽  
Electromagnetic Waves ◽  
Uniform Magnetic Field ◽  
Collision Frequency ◽  
Conducting Plane ◽  
Waveguide Type ◽  
Trapped Surface ◽  
Thin Plasma

It is shown that a thin ionized sheet will support a trapped surface wave. The effect of a constant and uniform magnetic field is to modify the phase velocity and polarization of the surface wave. The essential features are illustrated by numerical results for selected values of the electron density, collision frequency, and gyro frequency. The effect of locating the plasma sheet near and parallel to a conducting plane is also considered. In this situation other modes of a waveguide type are possible in addition to the surface wave.

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