Computer Science
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32.1371t&link_type=abstract
(International Association of Geomagnetism and Aeronomy, Symposium on Theory and Modelling of Hydromagnetic Waves, Hamburg, West
Computer Science
16
Earth Magnetosphere, Energetic Particles, Particle Interactions, Plasma-Electromagnetic Interaction, Space Plasmas, Compression Waves, Larmor Radius, Plasma Drift, Transverse Waves
Scientific paper
The energetic particle motion in electromagnetic fields of ULF waves is determined for the L-shell coordinate on the basis of a detailed statistical analysis of high resolution geomagnetic data. A generalized energy integral of the energetic particle motion in the three-dimensional electromagnetic fields of an azimuthally propagating wave is derived which is useful for describing the nonlinear particle behavior of ULF waves. The combination of the integral with the magnetic moment conservation leads to the formulation of a perturbation theory of particle flux modulations in terms of the guiding center distribution function. The theory is used to classify the origin of ULF flux modulations of energetic particles, i.e., the adiabatic mirror effect, nonadiabatic energy changes and associated L-shell displacement. A review is given of the basic wave modes constituting HM-coupling oscillations in nonuniform plasmas from a cold to a high-beta plasma.
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