Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm33c0467c&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SM33C-0467
Physics
2712 Electric Fields (2411), 2720 Energetic Particles: Trapped, 2724 Magnetopause And Boundary Layers, 2731 Magnetosphere: Outer, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
The cusp energetic particles (CEPs) can be energized locally by both resonant and stochastic acceleration mechanisms. The CEPs have been compared with the energetic ions in the outer radiation belt. The observations show that (1) the proton phase space densities in the outer radiation belt are organized by the magnetic moment and are independent of the solar wind conditions, (2) the phase space density of the belt He++ and O+ ions, at a given magnetic moment, increased with increasing latitude and altitude, (3) the observed phase space densities of both the He++ and O+ ion species in the cusp are significantly higher than those measured in the outer radiation belt at a given magnetic moment. The new fact (3) is very surprising because the radiation belt ions have much longer trapping time than the CEPs. Three different types of ion pitch angle distributions have been observed in the outer radiation belt at the same time. In the outer radiation belt, when the proton pitch angles showed a peak at 90° distribution (a stable trapping population), the He++ and O+ showed an isotropic distribution and a butterfly distribution, respectively, which suggest new ion sources from both parallel and anti-parallel field directions. Such directions may be connected magnetically to the equatorward edges of the southern and the northern cusps. These observational facts suggest that the CEPs are a potentially additional source of the charged particles in the outer radiation belt.
Cheb J.
Fritz Teresa A.
Sheldon Robert Bruce
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