Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm21c..05e&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM21C-05
Physics
2712 Electric Fields (2411), 2720 Energetic Particles, Trapped, 2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
ULF waves, with frequencies in the mHz range, are known to efficiently energize and transport relativistic electrons through resonant interactions leading to radial diffusion. However, the global structure, occurrence, and characteristics of the ULF waves are not well known. ULF waves may result from internal geomagnetic processes, such as excitation by ring current ions, or they may result as a consequence of the external interactions between the solar wind and the geomagnetic field. In the latter category, possible sources of ULF wave energy include (i) impulsive variations resulting from changes in the solar wind dynamic pressure; (ii) shear interactions occurring at the magnetopause; and (iii) dynamic variations in the IMF-Bz which lead to changes in the global convection electric field. In this work, we use the Lyon-Fedder-Mobarry MHD code to investigate the nature of magnetospheric ULF waves driven by these three interactions, under controlled, idealized solar wind conditions. In each case, the spatial and temporal characteristics of the waves will be investigated, including the radial penetration, spectral profile, and azimuthal mode structure of the waves.
Baker Daniel N.
Chan Anthony A.
Elkington Scot R.
Fei Yingwei
Wiltberger Michael J.
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