Theory 81/Planetary/Core dynamos
Dynamo Strength Is Convection Against Rotation
The claim
Magnetic field strength is set by the ratio of convective power to rotational constraint, so a slowly rotating planet needs more convection for the same field.
01Mechanism
Dynamo action requires convection vigorous enough to overcome rotational suppression of the flow.
02Prediction
Field strength should track the ratio.
03Refutation
Field tracking core size would remove rotation.