Kinetic Alfvén Waves: Linear theory and a Particle-in-cell Simulation

Details Kinetic Alfvén Waves: Linear theory and a Particle-in-cell Simulation Kinetic Alfvén Waves: Linear theory and a Particle-in-cell Simulation

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh21b0109g&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH21B-0109

Statistics

Computation

2159 Plasma Waves And Turbulence, 2164 Solar Wind Plasma, 7843 Numerical Simulation Studies, 7867 Wave/Particle Interactions

Scientific paper

An Alfvén-cyclotron fluctuation of sufficiently short wavelength has a strong proton cyclotron resonance at propagation parallel to the background magnetic field Bo in a collisionless electron-proton plasma. As θ , the angle between the fluctuation wavevector k and Bo increases, proton cyclotron wave-particle interactions become weaker and the electron Landau resonance becomes effective. Define the critical angle θ o beyond which the proton cyclotron interaction becomes nonresonant. Here linear Vlasov theory shows that this critical angle is relatively independent of β p over 0.001 <= β p <= 0.10, but that θ o is a sensitive function of the damping rate. Also, a particle-in-cell simulation was carried out in a magnetized, homogeneous, collisionless plasma of electrons and one ion species to study the plasma response to the initial imposition of an Alfvén-cyclotron wave at θ > θ o. The computation shows strong heating of the electrons in the direction parallel to Bo and the formation of a beam in the direction of parallel wave phase propagation.

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