{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:WVGU3ZHIJZNNQJQCJ4B5H7XQYN","short_pith_number":"pith:WVGU3ZHI","canonical_record":{"source":{"id":"1809.03923","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-09-11T14:24:08Z","cross_cats_sorted":[],"title_canon_sha256":"44e7d6eeb717a6b0de08513c8e66d9bc282e049846c11a456849d8d250c04b7c","abstract_canon_sha256":"ab93ace5a050827006908b4b7b66ccdc308d31763e39385fee195d8d43ca3654"},"schema_version":"1.0"},"canonical_sha256":"b54d4de4e84e5ad826024f03d3fef0c34a42171fd7ee5bd3c1ec32121fb7b7d7","source":{"kind":"arxiv","id":"1809.03923","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.03923","created_at":"2026-05-18T00:05:57Z"},{"alias_kind":"arxiv_version","alias_value":"1809.03923v1","created_at":"2026-05-18T00:05:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.03923","created_at":"2026-05-18T00:05:57Z"},{"alias_kind":"pith_short_12","alias_value":"WVGU3ZHIJZNN","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_16","alias_value":"WVGU3ZHIJZNNQJQC","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_8","alias_value":"WVGU3ZHI","created_at":"2026-05-18T12:33:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:WVGU3ZHIJZNNQJQCJ4B5H7XQYN","target":"record","payload":{"canonical_record":{"source":{"id":"1809.03923","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-09-11T14:24:08Z","cross_cats_sorted":[],"title_canon_sha256":"44e7d6eeb717a6b0de08513c8e66d9bc282e049846c11a456849d8d250c04b7c","abstract_canon_sha256":"ab93ace5a050827006908b4b7b66ccdc308d31763e39385fee195d8d43ca3654"},"schema_version":"1.0"},"canonical_sha256":"b54d4de4e84e5ad826024f03d3fef0c34a42171fd7ee5bd3c1ec32121fb7b7d7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:05:57.743357Z","signature_b64":"G/uX3w5SSxucTIGewhWO6yy0B0bak8n/jfoMO6stBhsNSR3ziGx0hnq8R9NrTWZJ5ob2hbIv0wDBfeuQTOgqCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b54d4de4e84e5ad826024f03d3fef0c34a42171fd7ee5bd3c1ec32121fb7b7d7","last_reissued_at":"2026-05-18T00:05:57.742826Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:05:57.742826Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1809.03923","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":"2026-05-18T00:05:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Mzn3zZAdQ8ZhdhAvIKJ8rhCJPNnXjl5kLjKJbBoB3G9aUPTg60w3HVVPd0T9SxdEp+WTLGYpeH10LDxBwAfPAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T12:25:59.678066Z"},"content_sha256":"ac75502e55323144b2a7e9181253ce56439a618b303436237de2f06d32e477d2","schema_version":"1.0","event_id":"sha256:ac75502e55323144b2a7e9181253ce56439a618b303436237de2f06d32e477d2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:WVGU3ZHIJZNNQJQCJ4B5H7XQYN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Polarization-driven spin precession of mesospheric sodium atoms","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"Dmitry Budker, Domenico Bonaccini Calia, Felipe Pedreros, Joschua Hellemeier, Mauro Centrone, Paul Hickson, Ronald Holzl\\\"ohner, Simon Rochester","submitted_at":"2018-09-11T14:24:08Z","abstract_excerpt":"We report experimental results on the first on-sky observation of atomic spin precession of mesospheric sodium driven by polarization modulation of a continuous-wave laser. The magnetic resonance was remotely detected from the ground by observing the enhancement of induced fluorescence when the driving frequency approached the precession frequency of sodium in the mesosphere, between 85 km and 100 km altitude. The experiment was performed at La Palma, and the uncertainty in the measured Larmor frequency ($\\approx$260 kHz) corresponded to an error in the geomagnetic field of 0.4 mG. The results"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.03923","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":""},"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":"2026-05-18T00:05:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vk6ZPPF93XEo0pB5RBOLxq5opDFBNo69GbEqEk35fHXj/3Oo1e3sbOiEz1Q4EZv0qIs/3KySJcSIIhUeBrGsDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T12:25:59.678469Z"},"content_sha256":"53b4f063052185e1767bcac4d53b00b09769634a1e07f93d7714ff971ec6f084","schema_version":"1.0","event_id":"sha256:53b4f063052185e1767bcac4d53b00b09769634a1e07f93d7714ff971ec6f084"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WVGU3ZHIJZNNQJQCJ4B5H7XQYN/bundle.json","state_url":"https://pith.science/pith/WVGU3ZHIJZNNQJQCJ4B5H7XQYN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WVGU3ZHIJZNNQJQCJ4B5H7XQYN/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":"2026-06-02T12:25:59Z","links":{"resolver":"https://pith.science/pith/WVGU3ZHIJZNNQJQCJ4B5H7XQYN","bundle":"https://pith.science/pith/WVGU3ZHIJZNNQJQCJ4B5H7XQYN/bundle.json","state":"https://pith.science/pith/WVGU3ZHIJZNNQJQCJ4B5H7XQYN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WVGU3ZHIJZNNQJQCJ4B5H7XQYN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:WVGU3ZHIJZNNQJQCJ4B5H7XQYN","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":"ab93ace5a050827006908b4b7b66ccdc308d31763e39385fee195d8d43ca3654","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-09-11T14:24:08Z","title_canon_sha256":"44e7d6eeb717a6b0de08513c8e66d9bc282e049846c11a456849d8d250c04b7c"},"schema_version":"1.0","source":{"id":"1809.03923","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.03923","created_at":"2026-05-18T00:05:57Z"},{"alias_kind":"arxiv_version","alias_value":"1809.03923v1","created_at":"2026-05-18T00:05:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.03923","created_at":"2026-05-18T00:05:57Z"},{"alias_kind":"pith_short_12","alias_value":"WVGU3ZHIJZNN","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_16","alias_value":"WVGU3ZHIJZNNQJQC","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_8","alias_value":"WVGU3ZHI","created_at":"2026-05-18T12:33:01Z"}],"graph_snapshots":[{"event_id":"sha256:53b4f063052185e1767bcac4d53b00b09769634a1e07f93d7714ff971ec6f084","target":"graph","created_at":"2026-05-18T00:05:57Z","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"},"paper":{"abstract_excerpt":"We report experimental results on the first on-sky observation of atomic spin precession of mesospheric sodium driven by polarization modulation of a continuous-wave laser. The magnetic resonance was remotely detected from the ground by observing the enhancement of induced fluorescence when the driving frequency approached the precession frequency of sodium in the mesosphere, between 85 km and 100 km altitude. The experiment was performed at La Palma, and the uncertainty in the measured Larmor frequency ($\\approx$260 kHz) corresponded to an error in the geomagnetic field of 0.4 mG. The results","authors_text":"Dmitry Budker, Domenico Bonaccini Calia, Felipe Pedreros, Joschua Hellemeier, Mauro Centrone, Paul Hickson, Ronald Holzl\\\"ohner, Simon Rochester","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-09-11T14:24:08Z","title":"Polarization-driven spin precession of mesospheric sodium atoms"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.03923","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:ac75502e55323144b2a7e9181253ce56439a618b303436237de2f06d32e477d2","target":"record","created_at":"2026-05-18T00:05:57Z","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":"ab93ace5a050827006908b4b7b66ccdc308d31763e39385fee195d8d43ca3654","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-09-11T14:24:08Z","title_canon_sha256":"44e7d6eeb717a6b0de08513c8e66d9bc282e049846c11a456849d8d250c04b7c"},"schema_version":"1.0","source":{"id":"1809.03923","kind":"arxiv","version":1}},"canonical_sha256":"b54d4de4e84e5ad826024f03d3fef0c34a42171fd7ee5bd3c1ec32121fb7b7d7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b54d4de4e84e5ad826024f03d3fef0c34a42171fd7ee5bd3c1ec32121fb7b7d7","first_computed_at":"2026-05-18T00:05:57.742826Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:05:57.742826Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"G/uX3w5SSxucTIGewhWO6yy0B0bak8n/jfoMO6stBhsNSR3ziGx0hnq8R9NrTWZJ5ob2hbIv0wDBfeuQTOgqCA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:05:57.743357Z","signed_message":"canonical_sha256_bytes"},"source_id":"1809.03923","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ac75502e55323144b2a7e9181253ce56439a618b303436237de2f06d32e477d2","sha256:53b4f063052185e1767bcac4d53b00b09769634a1e07f93d7714ff971ec6f084"],"state_sha256":"852b1823b3253b4dfb3cda440c77a6b6fa025f7249877da85b352460ddb47e46"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vlfK87Xi5JUEBVEUumnYF08SoRTR/0163M3XiBeuqRh+ecDn8ngrmwAf8mH9Wx3ZPUkSjuB/Ko5GWb8VHMJkDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T12:25:59.680801Z","bundle_sha256":"26f75c586a54ee678fd68cbe5953c7c2acdabc74ab09bfe479143d4261867e6d"}}