ULF Power Spectral Densities and Radial Diffusion Coefficients During High-Speed-Stream Storms

Details ULF Power Spectral Densities and Radial Diffusion Coefficients During High-Speed-Stream Storms ULF Power Spectral Densities and Radial Diffusion Coefficients During High-Speed-Stream Storms

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm21c..05c&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM21C-05

Physics

[2752] Magnetospheric Physics / Mhd Waves And Instabilities, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2774] Magnetospheric Physics / Radiation Belts

Scientific paper

Magnetospheric MHD waves in the mHz frequency range can strongly affect radiation belt electrons through radial transport, energization, and loss, and the power spectral density (PSD) of the MHD waves plays an important role in computing radial diffusion coefficients. In this paper power spectral densities are calculated using LFM global MHD simulations and then comparisons are made with measurements of MHD waves using GOES-8 and CRRES satellites. The PSD is also used to estimate radial diffusion coefficients, which are then compared with previous work, including Brautigam and Albert [2000], Fei et al. [2006], Huang et al. [2010], and recently-obtained radial diffusion coefficients from mapping ground-based magnetometer measurements to the equatorial magnetosphere. Finally, radial diffusion codes are run to compare simulated phase-space densities with observational data at GPS locations, for selected high-speed-stream storms. The radial diffusion coefficients show good consistency between LFM runs (simulation) and satellites (observation) when L<7. Based on these results, we seek to understand how to combine electric and magnetic radial diffusion coefficients to provide a more precise description of radial transport in the radiation belts.

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