Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm21b..02o&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM21B-02
Physics
[2720] Magnetospheric Physics / Energetic Particles: Trapped, [2774] Magnetospheric Physics / Radiation Belts, [7984] Space Weather / Space Radiation Environment
Scientific paper
The long-term variation of the Earth's radiation belts, i.e., their climatology, reveals important information about the forces and processes that modify the belts. For example, long-term data sets reveal the interaction of the seasonal and solar-cycle variations in the upper atmosphere and ionosphere with the radiation belts. A more complete picture arises when these long-term data are combined with physics-based simulations via data assimilation to produce a long-term, global, time-dependent description of the radiation belts, i.e., reanalysis. Such data sets are amenable to a variety of time-series and spatial analysis methods, such as principal component analysis, that can reveal subtle details of the underlying dynamics. For example, statistical analysis of outer zone electron reanalysis can be used to estimate activity-dependent energy and pitch-angle diffusion coefficients. In this talk, we will review our current understanding of radiation belt dynamics and describe methods now in use to gain scientific insight from long-term data and reanalysis.
Guild Timothy B.
O'Brien Thomas P.
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