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Pages 197-198

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From page 197...
... SOLAR WIND/MAGNETOSPHERE DYNAMO In an analogy with a dynamo-electric machine that generates electricity by rotating a conducting armature through a magnetic field, the motion of a plasma through a magnetic field produces an electromotive 300 y ~ 200 Cl 00 o ANGLE BETWEEN CONDUCTIVITY MAGNITUDE CURRENT AND PERPENDICULAR TO MAGNETIC FIELD ELECTRIC FIELD 400 1 1 1 1 / Night \Day 10-4 10-3 Go 45O 90O 10-7 10-6 10-5 S/m FIGURE 14.2 Typical profiles of the ionospheric conductivity component perpendicular to the geomagnetic field for day and night conditions (left) and angle between the current and electric-field components perpendicular to the geomagnetic field (right)
From page 198...
... To the extent that the MHD approximation is valid and electric fields map along the magnetic field, the polar ionosphere is also subject to an electric field out of the page, t ~ \ ~ ~ .~ ::= 14 l ~ ~ ~ ~ FIGURE 14.3 Schematic diagram of magnetic field and plasma flow in the solar wind/magnetosphere environment (from Lyons and Williams, 1984)


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