Physics
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17..909g&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, June 1990, p. 909-912. Research supported by DOE.
Physics
33
Earth Magnetosphere, Interplanetary Magnetic Fields, Magnetic Signatures, Magnetopause, Plasma Drift, Solar Terrestrial Interactions, Solar Wind, International Sun Earth Explorers, Particle Interactions, Transport Properties, Wave Interaction
Scientific paper
When the interplanetary magnetic field is northward, wave-particle cross-field transport may contribute to solar wind-magnetosphere coupling. Such transport is studied here through the use of hybrid computer simulations (particle ions, fluid electrons with nonzero mass) carried out in the x-y plane of a plasma with a density gradient in the x direction, no average flow speed, and a magnetic field B = B(x)z. At early times, the lower hybrid drift instability grows on the plasma gradient. However, at times long compared to an ion gyroperiod, the fluctuations coalesce to longer wavelengths in the y-direction, and nondiffusive density x-profiles emerge which exhibit 'plateaus' and 'inclusions' qualitatively similar to those observed by ISEE near the magnetopause. These results call into question critical assumptions of quasi-linear theories of cross-field transport by this instability.
Gary Peter S.
Sgro A. G.
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