Physics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990stin...9029287t&link_type=abstract
Unknown
Physics
Electron Density (Concentration), Magnetohydrodynamic Waves, Solar Radio Bursts, Solar Radio Emission, Solitary Waves, Velocity, Differential Equations, Mach Number, Magnetic Fields, Plasmas (Physics), Rarefaction
Scientific paper
Stationary solutions for the 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. In a first model, a cold plasma with beta less than (me/m sub i) is considered. 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. Kinetic Alfven solitons can propagate in both cases at Mach numbers M greater or less than 1, as rarefactions or as compressions of the plasma density. In both models rarefaction and compressional solitons are uniquely determined by beta and the propagation velocity vector. Interaction between the hot and cold electron components turn out to be significant for rarefactions of the cold component. Conditions for the existence of soliton solutions are given. The super-Alfvenic kind of solitary waves are applied to solar intermediate drift radio bursts. With a model of the emission process they can be used to determine the magnetic field and the electron density of the source.
Benz Arnold O.
Guedel Manuel
Treumann Rudolf A.
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