Ion transport and loss in the earth's quiet ring current. I - Data and standard model

Details Ion transport and loss in the earth's quiet ring current. I - Data and standard model Ion transport and loss in the earth's quiet ring current. I - Data and standard model

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9813491s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A8, p. 13,491-13,508.

Physics

77

Electric Fields, Ion Motion, Ionic Diffusion, Magnetosphere-Ionosphere Coupling, Proton Density (Concentration), Ring Currents, Electron Energy, Mathematical Models, Plasmasphere

Scientific paper

A study of the transport and loss of ions in the earth's quiet time ring current, in which the standard radial diffusion model developed for the high-energy radiation belt particles is compared with the measurements of the lower-energy ring current ions, is presented. The data set provides ionic composition information in an energy range that includes the bulk of the ring current energy density, 1-300 keV/e. Protons are found to dominate the quiet time energy density at all altitudes, peaking near L of about 4 at 60 keV/cu cm, with much smaller contributions from O(+) (1-10 percent), He(+) (1-5 percent), and He(2+) (less than 1 percent). A minimization procedure is used to fit the amplitudes of the standard electric radial diffusion coefficient, yielding 5.8 x 10 exp -11 R(E-squared)/s. Fluctuation ionospheric electric fields are suggested as the source of the additional diffusion detected.

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