Plasma diffusion at the magnetopause? The case of lower hybrid drift waves

Details Plasma diffusion at the magnetopause? The case of lower hybrid drift waves Plasma diffusion at the magnetopause? The case of lower hybrid drift waves

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pdmc.rept.....t&link_type=abstract

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Physics

Diffusion Coefficient, Magnetopause, Planetary Boundary Layer, Plasma Diffusion, Plasma Drift, Plasma Waves, Space Plasmas, Diffusion Waves, Flux Transfer Events, Magnetosheath, Solar Wind

Scientific paper

The diffusion expected from the quasilinear theory of the lower hybrid drift instability at the Earth's magnetopause is recalculated. The resulting diffusion coefficient is in principle just marginally large enough to explain the thickness of the boundary layer under quiet conditions, based on observational upper limits for the wave intensities. Thus, one possible model for the boundary layer could involve equilibrium between the diffusion arising from lower hybrid waves and various low processes. However, some recent data and simulations seems to indicate that the magnetopause is not consistent with such a soft diffusive equilibrium model. Furthermore, investigation of the nonlinear equations for the lower hybrid waves for magnetopause parameters indicates that the quasilinear state may never arise because coalescence to large wavelengths, followed by collapse once a critical wavelengths is reached, occur on a time scale faster than the quasilinear diffusion. In this case, an inhomogeneous boundary layer is to be expected. More simulations are required over longer time periods to explore whether this nonlinear evolution really takes place at the magnetopause.

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