Physics – Space Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm11b0823a&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM11B-0823
Physics
Space Physics
2712 Electric Fields (2411), 2748 Magnetotail Boundary Layers, 7815 Electrostatic Structures, 7831 Laboratory Studies, 7871 Waves And Instabilities
Scientific paper
Laboratory experiments have been conducted to simulate the dynamics of highly localized magnetospheric boundary layers. During periods of solar activity these regions, such as the plasma sheet boundary layer and the magnetopause, can become severely compressed - at times to scale lengths less than an ion gyroradius. Theoretical predictions indicate that the plasma can respond to relax these highly stressed conditions through the generation of instabilities in the lower hybrid frequency range [Ganguli et al., Phys. Fluids, 31, 2753 (1988)]. The NRL Space Physics Simulation Chamber (SPSC) experiments reported here demonstrate the characteristics of waves associated with these instabilities. Electric fields with scale length as small as ~ 0.25 ρ i have been created. Under these conditions, the onset of an instability in the lower hybrid frequency range has been observed with mode characteristics are similar to those expected for the Electron-Ion Hybrid Instability [Romero et al., Geophys. Res. Lett., 17, 2313 (1990)]. We present experimental results showing the transverse electric field structure and lower hybrid wave characteristics. *Work supported by the Office of Naval Research.
Amatucci William E.
Balkey Matthew M.
Ganguli Gurudas
Walker Danny N.
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