What specific force, generated by Venus's slow rotation, is too weak to organize the core material flow needed for a dynamo?
Answer
Coriolis force
The lack of a magnetic field on Venus is strongly linked to its rotation rate of 243 Earth days. When conducting fluid material moves within the core due to thermal convection, the Coriolis force—a fictitious force arising from observing motion on a rotating frame of reference—acts upon this moving fluid. For a dynamo to be sustained, this force must be strong enough to impose order, transforming the chaotic convective churning into organized, helical flows that generate stable magnetic field lines. Because Venus rotates so slowly, the resulting Coriolis forces are too weak to achieve this necessary organization, effectively halting the engine required for magnetic self-sustainment.
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