Access of energetic particles to storm time ring current through enhanced radial 'diffusion'

Details Access of energetic particles to storm time ring current through enhanced radial 'diffusion' Access of energetic particles to storm time ring current through enhanced radial 'diffusion'

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.5491l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, May 1, 1989, p. 5491-5496. Research supported by Aerospace Corp.

Physics

37

Energetic Particles, Geomagnetism, Magnetic Storms, Ring Currents, Electric Fields, Particle Diffusion, Radial Distribution, Transport Properties, Trapped Particles

Scientific paper

It is proposed that the transport of particles with energy of at least approximately 40 keV into the geomagnetic storm time ring current can result from enhanced stochastic radial transport driven by fluctuating electric fields during a storm's main phase. The effects of such electric fields are estimated by applying radial diffusion theory, assuming a preexisting trapped-particle population as the initial condition. The feasibility of explaining observed flux increases of particles of at least approximately 40 keV at no more than approximately 4 earth radii by enhanced radial 'diffusion' is then demonstrated. It is estimated that the at least approximately 40-keV portion of the storm time ring current at approximately 3 earth radii consists of about 50 percent preexisting and about 50 percent new particles. The formation of the storm time ring current is found to be perhaps explainable via a combination of direct radial transport at energies no greater than approximately 40 keV and 'diffusive' radial transport at higher energies.

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