{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:Y6D26ZOPUGR7WZ2E3VHY2DI3M6","short_pith_number":"pith:Y6D26ZOP","canonical_record":{"source":{"id":"2012.13324","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.space-ph","submitted_at":"2020-12-24T16:50:41Z","cross_cats_sorted":["astro-ph.EP","physics.geo-ph"],"title_canon_sha256":"6800ab8bd6b4b720094c5f7b331569645f6058f0f3c187127db732bcab3e2571","abstract_canon_sha256":"4be804ee7a4860e910cc9f2d1e6e4b7425e794f1929be3e7c2b0ac70987f9c23"},"schema_version":"1.0"},"canonical_sha256":"c787af65cfa1a3fb6744dd4f8d0d1b6797cd1373220ea07b5844448748eab60c","source":{"kind":"arxiv","id":"2012.13324","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2012.13324","created_at":"2026-07-05T02:01:57Z"},{"alias_kind":"arxiv_version","alias_value":"2012.13324v1","created_at":"2026-07-05T02:01:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2012.13324","created_at":"2026-07-05T02:01:57Z"},{"alias_kind":"pith_short_12","alias_value":"Y6D26ZOPUGR7","created_at":"2026-07-05T02:01:57Z"},{"alias_kind":"pith_short_16","alias_value":"Y6D26ZOPUGR7WZ2E","created_at":"2026-07-05T02:01:57Z"},{"alias_kind":"pith_short_8","alias_value":"Y6D26ZOP","created_at":"2026-07-05T02:01:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:Y6D26ZOPUGR7WZ2E3VHY2DI3M6","target":"record","payload":{"canonical_record":{"source":{"id":"2012.13324","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.space-ph","submitted_at":"2020-12-24T16:50:41Z","cross_cats_sorted":["astro-ph.EP","physics.geo-ph"],"title_canon_sha256":"6800ab8bd6b4b720094c5f7b331569645f6058f0f3c187127db732bcab3e2571","abstract_canon_sha256":"4be804ee7a4860e910cc9f2d1e6e4b7425e794f1929be3e7c2b0ac70987f9c23"},"schema_version":"1.0"},"canonical_sha256":"c787af65cfa1a3fb6744dd4f8d0d1b6797cd1373220ea07b5844448748eab60c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:01:57.250914Z","signature_b64":"eRTPgqy8N+ro/6aNaBr2tkkhKu20eautwc05w5C8MJsANaW+d6UlZimsrpOMbzDusWvsvcg0qx6OVs8psqJ0DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c787af65cfa1a3fb6744dd4f8d0d1b6797cd1373220ea07b5844448748eab60c","last_reissued_at":"2026-07-05T02:01:57.250546Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:01:57.250546Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2012.13324","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T02:01:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Es3pooal3H6eNMffoMObU9xsmV24GW64VOR97yzfUWGlEi5+Q38XbGEP6Nsdu/4yMWwX0DjrYAUogSA0+4TUCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T14:43:06.485460Z"},"content_sha256":"573aa2cfed3ba8b0ab99c413a8bf19a92042f4438da4ff16d2aa853228dc0b2b","schema_version":"1.0","event_id":"sha256:573aa2cfed3ba8b0ab99c413a8bf19a92042f4438da4ff16d2aa853228dc0b2b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:Y6D26ZOPUGR7WZ2E3VHY2DI3M6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Semi-annual, annual and Universal Time variations in the magnetosphere and in geomagnetic activity: 4. Polar Cap motions and origins of the Universal Time effect","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":["astro-ph.EP","physics.geo-ph"],"primary_cat":"physics.space-ph","authors_text":"Aude Chambodut, Carl Haines, Chris J. Scott, Kathryn A. McWilliams, Luke A. Barnard, Mathew J. Owens, Mike Lockwood","submitted_at":"2020-12-24T16:50:41Z","abstract_excerpt":"We use the am, an, as and the a-sigma geomagnetic indices to the explore a previously overlooked factor in magnetospheric electrodynamics, namely the inductive effect of diurnal motions of the Earth's magnetic poles toward and away from the Sun caused by Earth's rotation. Because the offset of the (eccentric dipole) geomagnetic pole from the rotational axis is roughly twice as large in the southern hemisphere compared to the northern, the effects there are predicted to be roughly twice the amplitude. Hemispheric differences have previously been discussed in terms of polar ionospheric conductiv"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2012.13324","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2012.13324/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T02:01:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eSJK5HgUpAt94lEIafGV3tcPXmuzYMw1xbdlFjQcLaZpBuUQpZO58jiajLRVymoU1nutdSUdaFoRe9EUiLXgAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T14:43:06.485876Z"},"content_sha256":"152479b2784edf6eeea3390ef238da6b571dc24c19938bd72c5972216cd78c18","schema_version":"1.0","event_id":"sha256:152479b2784edf6eeea3390ef238da6b571dc24c19938bd72c5972216cd78c18"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Y6D26ZOPUGR7WZ2E3VHY2DI3M6/bundle.json","state_url":"https://pith.science/pith/Y6D26ZOPUGR7WZ2E3VHY2DI3M6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Y6D26ZOPUGR7WZ2E3VHY2DI3M6/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-07-07T14:43:06Z","links":{"resolver":"https://pith.science/pith/Y6D26ZOPUGR7WZ2E3VHY2DI3M6","bundle":"https://pith.science/pith/Y6D26ZOPUGR7WZ2E3VHY2DI3M6/bundle.json","state":"https://pith.science/pith/Y6D26ZOPUGR7WZ2E3VHY2DI3M6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Y6D26ZOPUGR7WZ2E3VHY2DI3M6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:Y6D26ZOPUGR7WZ2E3VHY2DI3M6","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"4be804ee7a4860e910cc9f2d1e6e4b7425e794f1929be3e7c2b0ac70987f9c23","cross_cats_sorted":["astro-ph.EP","physics.geo-ph"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.space-ph","submitted_at":"2020-12-24T16:50:41Z","title_canon_sha256":"6800ab8bd6b4b720094c5f7b331569645f6058f0f3c187127db732bcab3e2571"},"schema_version":"1.0","source":{"id":"2012.13324","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2012.13324","created_at":"2026-07-05T02:01:57Z"},{"alias_kind":"arxiv_version","alias_value":"2012.13324v1","created_at":"2026-07-05T02:01:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2012.13324","created_at":"2026-07-05T02:01:57Z"},{"alias_kind":"pith_short_12","alias_value":"Y6D26ZOPUGR7","created_at":"2026-07-05T02:01:57Z"},{"alias_kind":"pith_short_16","alias_value":"Y6D26ZOPUGR7WZ2E","created_at":"2026-07-05T02:01:57Z"},{"alias_kind":"pith_short_8","alias_value":"Y6D26ZOP","created_at":"2026-07-05T02:01:57Z"}],"graph_snapshots":[{"event_id":"sha256:152479b2784edf6eeea3390ef238da6b571dc24c19938bd72c5972216cd78c18","target":"graph","created_at":"2026-07-05T02:01:57Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2012.13324/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We use the am, an, as and the a-sigma geomagnetic indices to the explore a previously overlooked factor in magnetospheric electrodynamics, namely the inductive effect of diurnal motions of the Earth's magnetic poles toward and away from the Sun caused by Earth's rotation. Because the offset of the (eccentric dipole) geomagnetic pole from the rotational axis is roughly twice as large in the southern hemisphere compared to the northern, the effects there are predicted to be roughly twice the amplitude. Hemispheric differences have previously been discussed in terms of polar ionospheric conductiv","authors_text":"Aude Chambodut, Carl Haines, Chris J. Scott, Kathryn A. McWilliams, Luke A. Barnard, Mathew J. Owens, Mike Lockwood","cross_cats":["astro-ph.EP","physics.geo-ph"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.space-ph","submitted_at":"2020-12-24T16:50:41Z","title":"Semi-annual, annual and Universal Time variations in the magnetosphere and in geomagnetic activity: 4. Polar Cap motions and origins of the Universal Time effect"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2012.13324","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:573aa2cfed3ba8b0ab99c413a8bf19a92042f4438da4ff16d2aa853228dc0b2b","target":"record","created_at":"2026-07-05T02:01:57Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"4be804ee7a4860e910cc9f2d1e6e4b7425e794f1929be3e7c2b0ac70987f9c23","cross_cats_sorted":["astro-ph.EP","physics.geo-ph"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.space-ph","submitted_at":"2020-12-24T16:50:41Z","title_canon_sha256":"6800ab8bd6b4b720094c5f7b331569645f6058f0f3c187127db732bcab3e2571"},"schema_version":"1.0","source":{"id":"2012.13324","kind":"arxiv","version":1}},"canonical_sha256":"c787af65cfa1a3fb6744dd4f8d0d1b6797cd1373220ea07b5844448748eab60c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c787af65cfa1a3fb6744dd4f8d0d1b6797cd1373220ea07b5844448748eab60c","first_computed_at":"2026-07-05T02:01:57.250546Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:01:57.250546Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"eRTPgqy8N+ro/6aNaBr2tkkhKu20eautwc05w5C8MJsANaW+d6UlZimsrpOMbzDusWvsvcg0qx6OVs8psqJ0DA==","signature_status":"signed_v1","signed_at":"2026-07-05T02:01:57.250914Z","signed_message":"canonical_sha256_bytes"},"source_id":"2012.13324","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:573aa2cfed3ba8b0ab99c413a8bf19a92042f4438da4ff16d2aa853228dc0b2b","sha256:152479b2784edf6eeea3390ef238da6b571dc24c19938bd72c5972216cd78c18"],"state_sha256":"cb05bef9fdcace06bf2df103e1d4a162152a12341f384b1cd68dfe39ffd1af3d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YUd7DnY8V/2TCT9A4GZ9fzxKGL+XM29l3ngeDR+9+CBCqW1dDebZ1lyw8oIEabrxKbpCYNALllRqx+IteikPDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T14:43:06.488040Z","bundle_sha256":"394d8d06b45a132c4f124d14f42e4035af6330bd7205d09a4cefcd53d591868d"}}