Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..36..455s&link_type=abstract
Astrophysics and Space Science, vol. 36, Sept. 1975, p. 455-458.
Astronomy and Astrophysics
Astrophysics
Drift Rate, Earth Magnetosphere, Particle Diffusion, Radiation Belts, Resonant Frequencies, Adiabatic Conditions, Electric Field Strength, Electromagnetic Fields, Particle Interactions, Radial Distribution, Stochastic Processes, Time Dependence
Scientific paper
In the usual formulation the radiation belts are considered to be immersed in randomly fluctuating electrostatic and electromagnetic fields. The fluctuations are thus adiabatic on the gyration and bounce time scales, but describable by smooth spectra that are nonvanishing at the particle drift frequency. The radial diffusion coefficient is then proportional to the spectral density at the drift resonance. But the usual formulation overlooks the fact that, by virtue of the radial diffusion thus described, a particle's drift frequency is itself a stochastic function of time. The classical uncertainty principle defines a nonvanishing bandwidth for the drift frequency over which the fluctuation spectrum must be averaged in order to define the diffusion coefficient. Radial diffusion of various magnetospheric particle populations, including protons and electrons, is considered.
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