Role of Long-Period Pc5 ULF Waves in Radiation Belt Transport and Loss

Details Role of Long-Period Pc5 ULF Waves in Radiation Belt Transport and Loss Role of Long-Period Pc5 ULF Waves in Radiation Belt Transport and Loss

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm21c..06m&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM21C-06

Physics

[2752] Magnetospheric Physics / Mhd Waves And Instabilities, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2774] Magnetospheric Physics / Radiation Belts, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions

Scientific paper

Large amplitude Pc4-5 ULF waves can be excited in the magnetosphere during active times, including the excitation of field line resonances and fast magnetosonic waves during fast solar wind speeds and magnetospheric compressions. We present a statistical analysis of over 10 years of ground-based magmetometer, as well as in-situ electric field power spectral densities, as a function of solar wind speed, MLT and L-shell for input into radiation belt diffusion models. The ground-based magnetic ULF wave observations are mapped into electric fields in the equatorial magnetosphere using the Ozeke et al. [2009] model. We compare these derived power spectra to those derived from previously published CRRES estimates and from the THEMIS satellites. We find an excellent agreement between the ground-based estimates and in-situ observations. Interestingly, the ground-based power spectra show evidence of mHz spectral power peaks consistent with those observed on CRRES. This suggests that field line resonances may play an energetically significant role in electric radial diffusion. Finally, we examine the role of ULF waves in radiation belt loss through the advection of magnetic field lines and oscillations of the magnetopause boundary under severe solar wind forcing. Such motion can cause shadowing losses significantly inside the equilibrium magnetopause location.

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