Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm42d..01b&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM42D-01
Physics
2149 Mhd Waves And Turbulence, 2722 Forecasting, 2740 Magnetospheric Configuration And Dynamics, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms
Scientific paper
By statistically examining the properties of the solar wind during various types of magnetospheric phenomena, we have produced a suggested taxonomy of the magnetospheric phenomena resulting from various properties of the solar-wind driver. These phenomena include periodic substorms, steady-magnetospheric-convection (SMC) events, storms with global sawtooth oscillations, storms without sawtooth oscillations, quiet periods with viscous convection, quiet periods without viscous convection. Periodic substorms tend to be found in times of modest southward vBz and normal to high amplitudes of upstream MHD turbulence. SMC events tend to be found in times of modest southward vBz and low-amplitude upstream turbulence. Global sawtooth oscillations tend to be found in times of big B, modest n, and low-amplitude upstream MHD turbulence. The geomagnetic indices are well correlated with the amplitude of upstream solar-wind turbulence. Under northward vBz this correlation is very clear, suggesting that (in analogy with fluid dynamics experiments) a viscous driven convection in the magnetosphere is being controlled by the amplitude of the solar-wind turbulence. A single diagram is presented summarizing the hypothesized taxonomy in vBz (reconnection) turbulence (viscosity) space. If the solar-wind-driver parameters are maintained for a sufficient amount of time, the predicted magnetospheric phenomena should occur.
Borovsky Joseph E.
Skoug Ruth M.
Smith Walter C.
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