{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"a70d2a7dab4e421f41db838c929369b74599d714fa61ddbb33f0226aadc6a845","created":"2026-10-03T07:18:02Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"720d6a6f4db4645dd1b8935894651eac490844191f26cd26866a6f69b04b0481","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"earth.geodynamo.scaling-regime","kind":"well-posed","literature_status":"partially-resolved","n":"1","parents":[],"plain":"Computer models of the core are still far too viscous compared to the real thing. It is unclear whether their results scale correctly to Earth.","posed_since":"","precise":"Simulations reach $E \\sim 1e-7 \\text{ to } 1e-8$ versus Earth's $E \\sim 1e-15$. Determine whether a magnetostrophic asymptotic regime exists in which field strength, flow length scales and secular variation become independent of viscosity, and whether present simulations lie in it. An answer is scaling laws verified over several decades of $E$ with the predicted exponents and Earth-extrapolated values matching observed field strength and secular variation.","problem_ref":null,"references":"","settled_by":"Simulation suites along a parameter path toward Earth values showing convergence of force balance and scaling exponents.","status_note":"Path-theory simulations since about 2017 approach a magnetostrophic force balance; whether reversing solutions persist along that path is studied as of 2025.","title":"Do numerical dynamos reach the asymptotic regime of Earth's 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