Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm42a..06u&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SM42A-06
Physics
2730 Magnetosphere: Inner, 2774 Radiation Belts, 2778 Ring Current, 7807 Charged Particle Motion And Acceleration, 7984 Space Radiation Environment
Scientific paper
During geomagnetic storms relativistic electrons in Earth's outer radiation belt exhibit highly nonlinear behavior. Electron fluxes in the belt vary over several orders in magnitude on the time scales from minutes to days. This work addresses radial transport and losses of radiation belt electrons during storms. For this purpose we developed a new semi-empirical model of the belt. The model is based on a test particle simulations of energetic electron motion in storm-time electric and magnetic fields. Global variations of magnetospheric electric and magnetic fields are derived from a dynamic model of geomagnetic field, for which the inductive electric field is calculated in a self-consistent fashion. We show that impulsive changes in solar wind dynamic pressure can result in rapid electron scattering across the drift shells, which identifies the dynamic pressure as one of the primary mechanisms of radial transport in the belt. Our calculations show that electron motion is inconsistent with radial diffusion, and hence a more detailed description is required for accurate predictions of electron fluxes in the belt. It is also shown that ring current enhancement during storm main phase can produce a substantial impact on electron motion. In particular, during large storms diamagnetic effect due to partial ring current sufficiently changes magnetic field structure in the inner magnetosphere leading to rapid magnetopause losses of radiation belt electrons.
Anderson Benjamin J.
C:son Brandt Pontus
Takahashi Keitaro
Tsyganenko Nikolai A.
Ukhorskiy Aleksandr Y.
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