Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh31a0383c&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH31A-0383
Physics
2706 Cusp, 2716 Energetic Particles: Precipitating, 2720 Energetic Particles: Trapped, 2740 Magnetospheric Configuration And Dynamics, 2774 Radiation Belts
Scientific paper
The high-altitude cusp has a size as large as 6 Re during geomagnetically quiet time and a size larger than 10 Re during high solar wind pressure periods. Such a huge size is comparable to the size of the entire dayside outer radiation belt. Energetic charged particles are observed there day after day. The cusp energetic particles (CEP) with energies from 20 keV up to 15 MeV are observed to increase in intensity by as much as four orders of magnitude when compared with regions adjacent to the cusp. The observed phase space densities of both the O+ and He^{++} ion species in the cusp are significantly higher than those measured in the outer radiation belt at a given magnetic moment, which is very surprising because the phase space density is proportional to the trapping time and because the radiation belt ions have much longer trapping time than the CEPs. These recent in situ satellite observations reveal that the high-altitude cusp is a new, large, radiation belt in the geospace.
Chen Jiahua
Fritz Teresa A.
Sheldon Robert Bruce
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