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Diffusion of Equatorial Particles in the Outer Radiation Zone
Author  Schulz, Michael; Eviatar, Aharon; 
Keywords  Radial Transport 
Abstract  Expansions and contractions of the permanently compressed magnetosphere lead to the diffusion of equatorially trapped particles across drift shells. A general technique for obtaining the electric fields induced by these expansions and contractions is described and applied to the Mead geomagnetic field model. The resulting electric drifts are calculated and are superimposed upon the gradient drift executed by a particle that conserves its first (μ) and second (J = 0) adiabatic invariants. The noonmidnight asymmetry of the unperturbed drift trajectory (resulting from gradient drift alone) is approximated by means of a simple model. In this model the angular drift frequency is found to be the geometric mean of a particle\textquoterights angular drift velocities at noon and midnight. The radial diffusion coefficient D = (\textonehalf) (ΔL)\texttwosuperior/time is calculated as a function of the McIlwain parameter L and in terms of the spectral density of fluctuations in the standoff distance of the magnetosphere boundary. Because the unperturbed drift trajectories are asymmetric, driftresonant diffusion of particles is produced by spectral components at all harmonics of the drift frequency, although the first (fundamental) harmonic is the major contributor. 
Year of Publication  1969 
Journal  Journal of Geophysical Research 
Volume  74 
Number of Pages  21822192 
Section  
Date Published  05/1969 
ISBN  
URL  http://onlinelibrary.wiley.com/doi/10.1029/JA074i009p02182/abstract 
DOI  10.1029/JA074i009p02182 