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Fig. 2

image

Field line (1) corresponds to the equilibrium position of a non-rotating potential dipole plunged in a uniform plasma. If the dipole is set into rotation about an axis perpendicular to itself, centrifugal forces (violet arrows) displace the field line from position 1–2. Simultaneously, and in assuming that the temperature effects can be neglected for simplicity purposes, a net outward-directed Lorentz force arises (blue arrow) and then accelerates the plasma in the x direction (the spin axis). One may note that the picture is pertinent provided that the Alfvén travel time from one footpoint to the other of the field line is much shorter than the rotation period.

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