{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"e505a2c4dd74027a5e8f9558513ac17e85fa1966b283d2502dea4175d1399ca5","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["9eb0d15c003029e824ce85bb558f52009c201f759cf9296f98440c8d005caa35","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"dcc2f18f83442f4695afaa3ef1a9967f81d5f587ff8e22a935405f1def8cfc92","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"astro.pulsars-magnetars.magnetar-field-origin","kind":"phenomenon","literature_status":"contested","n":"2","parents":[],"plain":"The field could be inherited from a strongly magnetic parent star or amplified by a dynamo (stirring motions that regenerate magnetic field) during the collapse.","posed_since":"1992","precise":"Determine whether magnetar dipole fields $B \\sim 10^{14}\\ \\text{to}\\ 10^{15}\\ \\mathrm{G}$ arise from flux conservation of fossil fields in magnetic massive stars (possibly stellar-merger products), from convective or magnetorotational dynamos in a proto-neutron star spinning at $P$ of a few ms, or from a fall-back-driven Tayler-Spruit dynamo. Answer: the channel or channels consistent with the magnetar birth fraction (estimates ~10 to 40 percent of neutron stars), ordinary supernova remnant energies and kick distributions.","problem_ref":"9eb0d15c003029e824ce85bb558f52009c201f759cf9296f98440c8d005caa35","references":"","settled_by":"Proto-neutron star dynamo simulations predicting field strengths and topology, compared with magnetar population statistics and remnant energetics.","status_note":"","title":"How do magnetars acquire fields of $1\\mathrm{e}14\\ \\text{to}\\ 1\\mathrm{e}15\\,\\mathrm{G}$?","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"47d8b2c43e40b13d8ae2fed30f45d5af1ef346da4e0a24ce23a5f5d871a1a108","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"390ec9066d92079a4d237fc3a09fefc5a891a0e612122e55005867e5573d2a7b","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"8hXL4BHsoa_VlisKCwfMlWF1_QWH_4k7h6vhwpPO2ML1EybuM6xMYRSsZ6RkX5a-PXXS32qicWunTrNQYcCTBw"},"schema":"pubphys.envelope/1"},"record_hash":"47d8b2c43e40b13d8ae2fed30f45d5af1ef346da4e0a24ce23a5f5d871a1a108","leaf_index":2404}