Comparison of diffusion and particle drift descriptions of radial transport in the earth's inner magnetosphere

Details Comparison of diffusion and particle drift descriptions of radial transport in the earth's inner magnetosphere Comparison of diffusion and particle drift descriptions of radial transport in the earth's inner magnetosphere

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9716865r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A11, p. 16,865-16,876.

Physics

22

Earth Magnetosphere, Particle Diffusion, Plasma Drift, Radial Distribution, Equatorial Atmosphere, Magnetic Moments, Transport Properties

Scientific paper

The paper compares two approaches for describing the radial motion of charged particles in the equatorial plane of the earth's magnetosphere: the radial diffusion and the guiding-center drift. For this purpose, a time-dependent observation-based model electrostatic field is computed for the August 1990 storm event, and this field is used to (1) calculate the guiding-center drift of a ring of monoenergetic test particles and (2) compute the specific radial diffusion coefficient and solve the relevant diffusion equation. Generally, only fair agreement was found between the guiding-center and the diffusion calculation approaches. The best agreement could be obtained for the case of a series of small storms rather than for one substantial storm.

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