Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm41c..06e&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM41C-06
Physics
7836 Mhd Waves And Instabilities (2149, 2752, 6050), 7845 Particle Acceleration, 7867 Wave/Particle Interactions (2483, 6984), 7984 Space Radiation Environment
Scientific paper
Variations in the Earth's electric and magnetic fields at ULF (mHz) frequencies can have a significant effect on the transport, energization, and loss of energetic electrons in the radiation belts. Direct driving by the solar wind can lead to a variety of ULF waves in the inner magnetosphere. In particular, velocity shear along the flanks of the magnetopause may set up Kelvin-Helmholtz waves at ULF frequencies in the dawn and dusk sector, and variations in the solar wind pressure can lead to ULF variations broadly distributed in local time across the dayside. Simulations using a global magnetohydrodynamic (MHD) model of the solar wind/magnetospheric interaction have been undertaken to characterize the global ULF wave activity that results from direct driving by the solar wind [Claudepierre et al., JGR 2008]. Here the simulations are run using controlled input parameters designed to excite and isolate waves driven by specific features in the solar wind. These studies have suggested that different sources of ULF activity will interact most effectively with different specific particle populations in various regions in the radiation belts. In this work, we conduct test particle simulations representing radiation belt electrons interacting with the directly-driven waves suggested by the global MHD simulations, and examine the efficiency with which different wave sources drive electron transport. We comment on those aspects of solar wind driving which contribute most significantly to the dynamics of different particle populations, and discuss the implications for radiation belt acceleration and loss.
Claudepierre Seth G.
Elkington Scot R.
Wiltberger Michael
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