Abstract
Coleman [1971] has suggested that the solar wind may exert sufficient torque on the terrestrial magnetosphere to effect observable changes in the earth's rate of rotation. Hirshberg [1972] has examined the torque available from the solar wind and has concluded that it is too small for the purpose. It is argued here that Hirshberg's development and conclusion could be undermined by a variant on her model, but that other considerations lead ultimately back to her conclusion. These considerations concern the rate of rotation that the polar ionosphere would achieve under the driving effect of the solar-wind torque and the resistive effect of viscous coupling through the neutral atmosphere from the ground.
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