text: Self-consistent numerical models of this process were created by Kuang and Bloxham, Kageyama and Sato, andÂ—
full_question: Self-consistent numerical models of this process were created by Kuang and Bloxham, Kageyama and Sato, andÂ—most famouslyÂ—Glatzmaier and Roberts. Many models of this process fail to produce westward drift in the secular variation. The alpha effect's transformation of a toroidal field to a poloidal field is important to understanding this process. Cowling's theorem forbids this process from producing an axisymmetric field. Adjusting the Prandtl number in simulations of it reveals the impact of the Coriolis effect on pole reversals. This self-sustaining process results from convective circulation of liquid iron and nickel by thermal buoyancy, which induces an electrical current. For 10 points, identify this process in the Earth's outer core that generates the Earth's magnetic field.
first_sentence: Self-consistent numerical models of this process were created by Kuang and Bloxham, Kageyama and Sato, andÂ—
raw_answer: core dynamo [or geodynamo; prompt on core convection or the process that creates the planetary magnetic fields or obvious equivalents of that set] 