{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"35439f34cd25a28b72a3c7723b9a7e5495bb19cac7cf0a28b12628a726d7a14d","created":"2026-10-03T07:18:03Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"896be731bc4fb3b2bf6a6991286f25afa1f2517519c0c3bd2a2f40058603494e","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"earth.planetary-dynamos.ice-giant-fields","kind":"phenomenon","literature_status":"open","n":"1","parents":[],"plain":"The magnetic fields of Uranus and Neptune are tipped far from the spin axis and lumpy, unlike those of other planets. This suggests the dynamo (the field generator) runs in a thin layer, but the interior is poorly known.","posed_since":"","precise":"Voyager 2 measured dipole tilts near 59 and 47 degrees with strong quadrupole and octupole components. Determine whether a thin-shell dynamo in an ionic water-dominated layer above a stably stratified interior reproduces these fields, and what interior structure is required. An answer is a dynamo model consistent with measured field harmonics and with gravity and heat-flow constraints.","problem_ref":null,"references":"","settled_by":"An orbiter mission measuring field harmonics, gravity and heat flow combined with dynamo models.","status_note":"","title":"Why are Uranus's and Neptune's fields strongly tilted and 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