Physics – Plasma Physics
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989plap.work...95g&link_type=abstract
In ESA, Proceedings of an International School and Workshop on Plasma Astrophysics, Volume 1 p 95-98(SEE N89-24910 18-75)
Physics
Plasma Physics
Magnetohydrodynamic Waves, Particle Interactions, Plasma Drift, Solar Radio Bursts, Solitary Waves, Wave Propagation, Beta Factor, Plasma Density, Plasma Physics, Propagation Velocity, Solar Magnetic Field, Velocity Distribution
Scientific paper
Stationary solutions for Alfven solitons propagating obliquely in a homogeneous magnetic field are investigated. Due to their dispersive nature kinetic Alfven waves can evolve into soliton like structures which propagate at velocities of the order of the Alfven velocity in a direction inclined to the magnetic field. The first model keeps the plasma Beta less than me/mi. Kinetic Alfven solitons in this case can propagate at Mach numbers greater or less than 1 as dilutions or as compressions of the plasma density. In the second model the plasma contains two electron components, a hot one and a cold one. Differential equations for the plasma density are derived, and examples of numerical solutions for the plasma density profiles are presented. Both dilutive and compressional solitons are uniquely determined by Beta and the propagation velocity vector. Conditions for the existence of soliton solutions are given. Interactions between the hot and the cold electron component turn out to be significant for dilutions of the cold component. This kind of solitary density wave is applied to solar intermediate drift radio bursts.
Benz Arnold O.
Guedel Manuel
Treumann Rudolf A.
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