Theory of the low-latitude boundary layer

Details Theory of the low-latitude boundary layer Theory of the low-latitude boundary layer

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.2017s&link_type=abstract

Journal of Geophysical Research, vol. 85, May 1, 1980, p. 2017-2026. Research supported by the Max-Planck-Gesellschaft zur Foer

Physics

50

Atmospheric Models, Boundary Layer Plasmas, Equatorial Atmosphere, Magnetopause, Current Density, Electric Fields, Field Aligned Currents, Momentum Transfer, Steady State, Viscous Flow

Scientific paper

A one-dimensional steady state fluid mechanical model is developed of the low-latitude plasma boundary layer inside the dawn and dusk magnetopause. Momentum transfer in the layer is produced by viscosity and/or mass diffusion. Coupling to the ionosphere is achieved via field-aligned currents, the magnitude of which is limited by parallel potential drops. These currents flow into and out of the ionosphere in the manner described by Iijima and Potemra. The higher-latitude (region 1) currents are associated with the boundary layer proper, while the lower-latitude (region 2) ones are associated with a region of sunward return flow adjacent to the boundary layer. The parallel potential drops have a magnitude of typically 2-3 kV and a north-south extent of 100-200 km. The calculated potential profile corresponds reasonably well to observed inverted V precipitation events.

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