SP-345 Evolution of the Solar
System
FIGURE 17.2.1.- Partial corotation
Equilibrium between gravitational force fG, centrifugal
force fc, and
electromagnetic force fB implies that
fG +
fc +
fB= 0. Because 
, the geometry of the magnetic dipole field requires
that
. (From Alfvén et al., 1974. )
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