Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm53a1444m&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM53A-1444
Physics
2720 Energetic Particles: Trapped, 2753 Numerical Modeling, 2774 Radiation Belts, 2788 Magnetic Storms And Substorms (7954), 3315 Data Assimilation
Scientific paper
We present results from a data-assimilation of radiation belt electrons and investigate the effect of the radial diffusion and the amplitude of the plasmashpheric hiss. In the data-assimilation, we use our 1-D radial diffusion model [Miyoshi et al., 2003, JGR] which includes various physical processes of the radiation belts such as radial diffusion, Coulomb collisions, and wave-particle interactions. We assimilate in-situ electrons measured by the Tsubasa satellite into a 1-D radial diffusion model. The particle filter is used for the assimilation to handle the nonlinear property of the model. We compare the assimilation result with the simulation obtained with the empirical radial diffusion coefficients as function of Kp index [Brautingam and Albert, 2000]. While the latter simulation overestimates the flux of the outer belt, the assimilation reproduces the appropriate flux variation. The result indicates that the data-assimilation is a powerful method to improve the physical model of the radiation belt which would be an important issue for the space weather.
Goka Tateo
Jordanova Vania
Miyoshi Yasunobu
Reeves Galen
Ueno Genta
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