Physics
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16.1133c&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 16, Oct. 1989, p. 1133-1136.
Physics
21
Magnetohydrodynamic Waves, Magnetospheric Proton Density, Ring Currents, Magnetic Dipoles, Nonlinear Equations, Plasma Drift
Scientific paper
In order to study nonlinear wave-particle interactions in the earth magnetosphere Hamiltonian equations are derived for the gyrophase-averaged nonrelativistic motion of charged particles in a perturbed dipole magnetif field. Low-frequency (less than the proton gyrofrequency) full electromagnetic perturbations are assumed, and finite-Larmor-radius effects are retained. Analytic and numerical results for the stochastic threshold of energetic protons (above 100 keV) in compressional geomagnetic pulsations in the Pc 5 range of frequencies (150-600 sec) are presented. These protons undergo a drift-bounce resonance with the Pc 5 waves which breaks the second (longitudinal) and third (flux) adiabatic invariants, while the first invariant (the magnetic moment) and the proton energy are approximately conserved. The proton motion in the observed spectrum of waves is found to be strongly diffusive, due to the overlap of neighboring primary resonances.
Chan Anthony A.
Chen Liu
White Roscoe B.
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