Physics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1611l&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, Aug. 1991, p. 1611-1614. Research supported by NSERC.
Physics
1
Chaos, Kinetic Theory, Magnetohydrodynamic Waves, Particle Motion, Earth Magnetosphere, Electric Fields, Electron Distribution, Power Spectra, Time Series Analysis
Scientific paper
A simple model is presented which describes the effect of a kinetic Alfven wave on the motion of a test electron along a closed magnetic field line. It is shown that the electron motion can be strongly chaotic for a wide range of conditions. The chaos exhibits a broadband power spectrum in the frequency domain, although only three principal frequencies are involved in the model. Phase space density of electrons exhibits complex but physically interesting evolution in response to the KAW. Typical of a chaotic situation, the scale of the electron distribution in phase space descends rapidly over the scale hierarchy to give rise to a growing set of irregularities, which may in turn generate strong electrostatic turbulences. This chain of events suggests a fundamental mechanism that couples physical processes of different scales.
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