Figure 1:
Critical period as a function of the differential rotation
parameter. The two curves refer to different values of ,
with the
solid parts corresponding to a
-dynamo and the dashed parts
to a
-dynamo.
Figure 2:
Toroidal ()
and the poloidal ()
magnetic field
lines. Solid and dashed contours correspond to positive and negative
values, respectively. The dot-dashed line marks the position of
.