Physics – Plasma Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.4421j&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 23, p. 4421-4424
Physics
Plasma Physics
26
Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers, Space Plasma Physics: Kinetic And Mhd Theory, Space Plasma Physics: Transport Processes, Space Plasma Physics: Wave/Particle Interactions
Scientific paper
The magnetopause and boundary layer are typically characterized by large amplitude transverse wave activity with frequencies below the ion cyclotron frequency. The signatures of the transverse waves suggest that they are kinetic Alfvén waves with wavelength on the order of the ion gyroradius [Johnson and Cheng, 1997a; Johnson et al., 2001]. We investigate ion motion in the presence of large amplitude kinetic Alfvén waves with wavelength the order of ρi and demonstrate that for sufficiently large wave amplitude (δB⊥/B0>0.05) the particle orbits become stochastic. As a result, low energy particles in the core of the ion distribution can migrate to higher energy through the stochastic sea leading to an increase in T⊥ and a broadening of the distribution. This process can explain transverse ion energization and formation of conics which have been observed near the magnetopause in both the magnetosheath and low-latitude boundary layer.
Cheng C. Z.
Johnson Jay Robert
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