  The neutrals in the Earth environment are in fact free and subjected to drag
forces (by ions). In this study we show that drag or friction forces in the
ionosphere-thermosphere system initiate changes in the plasma flow, neutral
wind, and the conductivity, as well. Ions and electrons embedded in neutral
wind field of velocity u acquire drifts perpendicular both to the initial
neutral wind velocity and to the ambient magnetic field producing a
perpendicular electric current. This perpendicular electric current is defined
by a conductivity derived previously and the polarization electric field u x B.
Self-consistently, the free neutrals acquires an additional neutral velocity
component perpendicular to the initial neutral wind velocity u. The Pedersen
and Hall currents wane within a specific time inversely proportional to
neutral-ion collision frequency. These findings are relevant to a better
understanding of electric current generation, distribution and closure in
weakly ionized plasmas where charged particles (plasma) and neutrals are not
bound (free) as the ionosphere and thermosphere in the Earth environment, the
solar atmosphere-chromosphere region and even dusty plasmas. The theoretical
results supposedly address to recent observations of meso-scale neutral wind
rotation in the vicinity of auroral arcs (Kosch et al, 2010).
