{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"f3eceaeb0e7fff9080ed1fdb9e3b2b8cc2b9f2e7ce80450da4f42230cb114965","created":"2026-10-03T07:17:51Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"86aacf39de5e7e298f5848ed54190337569a556091513a5af04ac5c4a8f8fa7d","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"earth.geodynamo","field":"earth","n":"1","review_cite":"Paul H. Roberts, Eric M. King, On the genesis of the Earth's magnetism, Reports on Progress in Physics, 2013","review_link":"https://doi.org/10.1088/0034-4885/76/9/096801","review_verified":"true","summary":"Earth's magnetic field is made by churning liquid iron in the outer core, and every so often the north and south magnetic poles swap places. Nobody can yet say what triggers a swap or what kept the field alive for billions of years.","title":"Geodynamo and geomagnetic polarity reversals","topic_ref":null,"why":"The field shields the atmosphere and life from the solar wind, and its history records the thermal evolution of the core."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"e13e768be35f03c6e8ec9a4a4d6987bded1527805358b1af395bbdf03b08e310","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"b588c5c05417f08894c6c5573ebd54207c2e952f8d0d58d2f1045bc3a7400612","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"Vp6GE4wVXhD2iRuvgxjxpw6QVZo_lVWKo6sEyISsAjVQIGrNnmru9h5ozrlmEt68U174gPRkz83dAKjdvW-jCg"},"schema":"pubphys.envelope/1"},"record_hash":"e13e768be35f03c6e8ec9a4a4d6987bded1527805358b1af395bbdf03b08e310","leaf_index":199}