Radiation Belt Radial Diffusion Coefficients Derived From Ground-based and In-situ ULF Wave Measurements

Details Radiation Belt Radial Diffusion Coefficients Derived From Ground-based and In-situ ULF Wave Measurements Radiation Belt Radial Diffusion Coefficients Derived From Ground-based and In-situ ULF Wave Measurements

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm22a..01m&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM22A-01

Physics

Plasma Physics

[7807] Space Plasma Physics / Charged Particle Motion And Acceleration, [7836] Space Plasma Physics / Mhd Waves And Instabilities, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

Ultra Low Frequency (ULF) wave power in the Pc5 period band is thought to play an important role in the dynamics, acceleration and transport of energetic electrons in the outer radiation belt. Current estimates of radial diffusion coefficients are typically derived empirically and characterised in terms of Kp. Using the results from a statistical analysis of ground-based and in-situ electric- and magnetic field power spectral densities as a function of solar wind speed, MLT and L-shell we compile statistical representations for the transport under a diffusive approximation. Electric diffusion rates are calculated using ground-based data from the CARISMA magnetometer network and mapped into in-situ equatorial electric fields using the Ozeke et al. [2009] model. These diffusion rates are compared to those derived from the THEMIS satellites and from previously published CRRES estimates. We find an excellent comparison between the ground-based estimates and in-situ observations. Interestingly the ground-based Pc5 power spectra show evidence of mHz spectral power peaks consistent with those observed on CRRES, and consistent with a role for field line resonances in radial diffusion. We further calculate the magnetic diffusion coefficients using data from THEMIS and GOES, and compare with previous AMPTE estimates. Overall such analysis provides a wave power based method for calculating diffusive transport using observed wave fields. Future in-situ radiation belt missions such as the Canadian Space Agency Outer Radiation Belt Injection, Transport, Acceleration and Loss Satellite (ORBITALS) will enable these physics-based models to be tested and will provide an excellent complement to the single point measurements available from the satellites.

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