Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm31b..05j&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #SM31B-05
Physics
2724 Magnetopause And Boundary Layers, 2772 Plasma Waves And Instabilities (2471), 7827 Kinetic And Mhd Theory, 7859 Transport Processes, 7867 Wave/Particle Interactions (2483, 6984)
Scientific paper
Recent ion composition measurements near the magnetopause have shown that heavy ionospheric ions can dominate the mass density as much as 30 percent of the time. Magnetopause transport processes, such as reconnection, Kelvin-Helmholtz instability, and kinetic-scale Alfvenic fluctuations, can all be significantly affected by the presence of heavy ions. Heavy ions modify the onset and growth of the tearing mode as well as reduce the steady state reconnection rate by lowering the Alfven speed. Increased mass density reduces the effect of magnetic tension and therefore lowers the Kelvin-Helmholtz instability threshold and increases the growth rate. The presence of heavy ions can also increase the efficiency of mode conversion of compressional Pc3 waves to transverse, field-aligned Alfven modes with small-scale structure perpendicular the the magnetopause. We show that nonlinear heating and transport associated with mode converted waves will preferentially affect the heavy ions. Because heavy ions can significantly influence physical processes at the magnetopause associated with mass, momentum, and energy transport; we discuss how they could be used as a tool to probe those physical processes responsible for the transport.
Johnson Jesse
Kim Erik
Lin Yangtin
Wing Simon
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