Physics – Space Physics
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rvgsp..19..171g&link_type=abstract
Reviews of Geophysics and Space Physics, vol. 19, Feb. 1981, p. 171-184.
Physics
Space Physics
60
Earth Magnetosphere, Particle Diffusion, Plasma-Particle Interactions, Space Plasmas, Wave Amplification, Distribution Functions, Electromagnetic Wave Transmission, Helium Ions, Magnetoplasmadynamics, Vlasov Equations, Wave Interaction
Scientific paper
The general relationships are studied between wave amplification and particle diffusion, in different conditions of particle distribution and in different categories of magnetoplasmas. Simple physical arguments are used to establish criteria for the relative stability of a given distribution function, with respect to electromagnetic waves propagating along the dc magnetic field. The method is based on the relative configuration in the velocity space of the isodensity, the constant energy, and the diffusion curves. It is shown that the equation which gives the amplification coefficients of the waves, and the one which expresses the diffusion of particles, involve the same operator, which corresponds to the derivative taken along the diffusion curve. The origin of this property lies in the special form of the Boltzmann-Vlasov equation.
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