Geomagnetic field fluctuations at synchronous orbit. II - Radial diffusion

Physics

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Electron Diffusion, Geomagnetism, Geosynchronous Orbits, Magnetic Variations, Radiation Belts, Satellite Observation, Ats 6, Diffusion Coefficient, Power Spectra, Relativistic Particles, Time Dependence, Vertical Motion

Scientific paper

Power spectra of geomagnetic-field variations measured at synchronous equatorial altitude (geomagnetic shell parameter about 6.6) in the magnetosphere are used to calculate the time dependence of the radial diffusion coefficient for particles in the radiation belts. The diffusion coefficients calculated are mainly applicable for relativistic electrons. The magnitudes of the derived diffusion coefficients using data only from local day observations are consistent with those reported from analyses of most particle observations and thus are slightly larger than those derived from magnetic sudden commencements. They are consistent with the diffusion coefficients calculated from power spectra of ground-based geomagnetic data measured near L = 4.

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