Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm21a1678t&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM21A-1678
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2720 Energetic Particles: Trapped, 2774 Radiation Belts, 7954 Magnetic Storms (2788), 7959 Models
Scientific paper
Using recently published electron phase space densities (PSD) as a function of L (L is approximately the radial distance in Earth radii at the equator) and time, energization and loss in the Earth's outer electron radiation belt were studied quantitatively and numerically using a radial diffusion model that included finite electron lifetimes and an internal source parameterized as a function of geomagnetic indices. PSD data at fixed first and second adiabatic invariants, corresponding to fairly energetic electrons at L=4 (2.7 MeV) mirroring near the Earth's equator were used. Model results for the second half of 2002 reproduced the average variations of the radiation belt electron PSD between L=2.5 and L=6 but with over-prediction and under-prediction at different times, implying that the same set of parameters cannot be applied to all storms. A detailed analysis of four individual storms showed that while electrons in three storms could be well simulated by energization from either radial diffusion only or internal heating only, incorporating both yielded the best results. For the other storm, an additional source of electrons was required to account for the enhanced PSD. The model results indicated that each storm is best simulated when combination of radial diffusion and internal heating is used. Different storms required different magnitudes of radial diffusion and internal heating and the relative contributions of these two acceleration mechanisms varied from storm to storm. A comparison of the results from different runs for the four storms and an analysis of the larger than expected radial diffusion coefficients further suggests that internal heating contributes more to the enhancement of 2.7 MeV electrons at L=4 than radial diffusion.
Chen Yafeng
Li Xiaoliang
Reeves Galen
Temerin Michael
Tu Weichao
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