Quantifying ULF Waves in the Inner Magnetosphere and Their Effects on Radiation Belt Electrons

Details Quantifying ULF Waves in the Inner Magnetosphere and Their Effects on Radiation Belt Electrons Quantifying ULF Waves in the Inner Magnetosphere and Their Effects on Radiation Belt Electrons

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm21a0334h&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM21A-0334

Computer Science

Performance

2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2753 Numerical Modeling, 2774 Radiation Belts

Scientific paper

Identifying and determining the acceleration, transport, and loss mechanisms that populate, maintain, and modify radiation belt electrons remains one of the major open scientific questions in the magnetospheric community. We demonstrate new ways to characterize and study the ultra-low-frequency (ULF) waves in the inner magnetosphere that are critical for controlling radiation belt electron dynamics. A statistical study of Geosynchronous Operational Environmental Satellite (GOES) magnetic field data reveals the characteristics of ULF wave spectra at geosynchronous orbit during different solar wind conditions and levels of geomagnetic activity. In order to understand the dynamic behavior of radiation belt electrons in ULF wave fields, a global, realistic, self-consistent, and time-dependent magnetospheric model is needed. Therefore, we compare Lyon- Fedder-Mobarry (LFM) code predictions with geosynchronous measurements to assess model performance and to quantify the field fluctuations in the inner magnetosphere. Next, the dynamics of radiation belt electrons are simulated using global magnetic and electric fields from the LFM code, driven by idealized solar wind over a range of velocities. We follow the trajectories of electrons, starting at different local times and radii for the same first adiabatic invariant, to understand their transport and energization through collective wave-particle interactions. Finally, we quantify the ULF wave effects on radiation belt electrons by calculating the radial diffusion coefficients from the LFM simulation results. Our results demonstrate that the derived coefficients as a function of solar wind velocity are comparable to observational results after normalizing for wave power.

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