{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:NO44VIU5Q5PMOVIRLTQW46TVTH","short_pith_number":"pith:NO44VIU5","canonical_record":{"source":{"id":"1308.2283","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-08-10T07:30:08Z","cross_cats_sorted":[],"title_canon_sha256":"b2b765ce816de370f4ae15d5ca36450d1ce72469fdf0c1ede0da0efdd7693786","abstract_canon_sha256":"99e76746ce7d4c06797e91bc5a58fb369a82de3a4d9f339b35d703941e018062"},"schema_version":"1.0"},"canonical_sha256":"6bb9caa29d875ec755115ce16e7a7599d8aba9d1fdf523f205ca28c3a8c06f00","source":{"kind":"arxiv","id":"1308.2283","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1308.2283","created_at":"2026-05-18T01:48:16Z"},{"alias_kind":"arxiv_version","alias_value":"1308.2283v1","created_at":"2026-05-18T01:48:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.2283","created_at":"2026-05-18T01:48:16Z"},{"alias_kind":"pith_short_12","alias_value":"NO44VIU5Q5PM","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_16","alias_value":"NO44VIU5Q5PMOVIR","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_8","alias_value":"NO44VIU5","created_at":"2026-05-18T12:27:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:NO44VIU5Q5PMOVIRLTQW46TVTH","target":"record","payload":{"canonical_record":{"source":{"id":"1308.2283","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-08-10T07:30:08Z","cross_cats_sorted":[],"title_canon_sha256":"b2b765ce816de370f4ae15d5ca36450d1ce72469fdf0c1ede0da0efdd7693786","abstract_canon_sha256":"99e76746ce7d4c06797e91bc5a58fb369a82de3a4d9f339b35d703941e018062"},"schema_version":"1.0"},"canonical_sha256":"6bb9caa29d875ec755115ce16e7a7599d8aba9d1fdf523f205ca28c3a8c06f00","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:48:16.646246Z","signature_b64":"Ug+bkklngajXpvNKcjuDs2tsCN0F/xMGMo3zmJU7KKKlBA0BzKO6ioF78bSq2pa833QZgNtirb9M6UdXx44eAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6bb9caa29d875ec755115ce16e7a7599d8aba9d1fdf523f205ca28c3a8c06f00","last_reissued_at":"2026-05-18T01:48:16.645708Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:48:16.645708Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1308.2283","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":"2026-05-18T01:48:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WaDjWLpDqWzFKRgjCSuZmyxEK6kBVhmOuhbU4Xy5qp4lfxUkWiv+FnsKE8hPHH3YQD2TDoztnprYVNbKii22BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T01:52:12.806163Z"},"content_sha256":"607422442d0b2bc840564611b3bd6e127919bd523efbfebc80de4c7d66588ffa","schema_version":"1.0","event_id":"sha256:607422442d0b2bc840564611b3bd6e127919bd523efbfebc80de4c7d66588ffa"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:NO44VIU5Q5PMOVIRLTQW46TVTH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Measurements of Coronal and Chromospheric Magnetic Fields using Polarization Observations by the Nobeyama Radioheliograph","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Kazumasa Iwai, Kiyoto Shibasaki","submitted_at":"2013-08-10T07:30:08Z","abstract_excerpt":"Coronal and chromospheric magnetic fields are derived from polarization and spectral observations of the thermal free-free emission using the Nobeyama Radioheliograph (NoRH). In magnetized plasma, the ordinary and extraordinary modes of free-free emission have different optical depths. This creates a circularly polarized component in an atmosphere with a temperature gradient. We observed an active region on April 13, 2012 to derive its coronal and chromospheric magnetic fields. The observed degree of circular polarization was between 0.5 % and 1.7 %. The radio circular polarization images were"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.2283","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":"2026-05-18T01:48:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"E7xid78+d42Aa8zujvU0f4GAEiYIqjmKMI0jRTJHd+R0uw36oXOHi7yeFH788BtYaeHut1Plxt3ZcGoKCa29Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T01:52:12.806534Z"},"content_sha256":"d53dbacd0a6c6f952e888f7baacff8321f38f425cfd1ec20af0666092375b402","schema_version":"1.0","event_id":"sha256:d53dbacd0a6c6f952e888f7baacff8321f38f425cfd1ec20af0666092375b402"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NO44VIU5Q5PMOVIRLTQW46TVTH/bundle.json","state_url":"https://pith.science/pith/NO44VIU5Q5PMOVIRLTQW46TVTH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NO44VIU5Q5PMOVIRLTQW46TVTH/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":"2026-06-26T01:52:12Z","links":{"resolver":"https://pith.science/pith/NO44VIU5Q5PMOVIRLTQW46TVTH","bundle":"https://pith.science/pith/NO44VIU5Q5PMOVIRLTQW46TVTH/bundle.json","state":"https://pith.science/pith/NO44VIU5Q5PMOVIRLTQW46TVTH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NO44VIU5Q5PMOVIRLTQW46TVTH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:NO44VIU5Q5PMOVIRLTQW46TVTH","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":"99e76746ce7d4c06797e91bc5a58fb369a82de3a4d9f339b35d703941e018062","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-08-10T07:30:08Z","title_canon_sha256":"b2b765ce816de370f4ae15d5ca36450d1ce72469fdf0c1ede0da0efdd7693786"},"schema_version":"1.0","source":{"id":"1308.2283","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1308.2283","created_at":"2026-05-18T01:48:16Z"},{"alias_kind":"arxiv_version","alias_value":"1308.2283v1","created_at":"2026-05-18T01:48:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.2283","created_at":"2026-05-18T01:48:16Z"},{"alias_kind":"pith_short_12","alias_value":"NO44VIU5Q5PM","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_16","alias_value":"NO44VIU5Q5PMOVIR","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_8","alias_value":"NO44VIU5","created_at":"2026-05-18T12:27:52Z"}],"graph_snapshots":[{"event_id":"sha256:d53dbacd0a6c6f952e888f7baacff8321f38f425cfd1ec20af0666092375b402","target":"graph","created_at":"2026-05-18T01:48:16Z","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":"Coronal and chromospheric magnetic fields are derived from polarization and spectral observations of the thermal free-free emission using the Nobeyama Radioheliograph (NoRH). In magnetized plasma, the ordinary and extraordinary modes of free-free emission have different optical depths. This creates a circularly polarized component in an atmosphere with a temperature gradient. We observed an active region on April 13, 2012 to derive its coronal and chromospheric magnetic fields. The observed degree of circular polarization was between 0.5 % and 1.7 %. The radio circular polarization images were","authors_text":"Kazumasa Iwai, Kiyoto Shibasaki","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-08-10T07:30:08Z","title":"Measurements of Coronal and Chromospheric Magnetic Fields using Polarization Observations by the Nobeyama Radioheliograph"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.2283","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":"sha256:607422442d0b2bc840564611b3bd6e127919bd523efbfebc80de4c7d66588ffa","target":"record","created_at":"2026-05-18T01:48:16Z","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":"99e76746ce7d4c06797e91bc5a58fb369a82de3a4d9f339b35d703941e018062","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-08-10T07:30:08Z","title_canon_sha256":"b2b765ce816de370f4ae15d5ca36450d1ce72469fdf0c1ede0da0efdd7693786"},"schema_version":"1.0","source":{"id":"1308.2283","kind":"arxiv","version":1}},"canonical_sha256":"6bb9caa29d875ec755115ce16e7a7599d8aba9d1fdf523f205ca28c3a8c06f00","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6bb9caa29d875ec755115ce16e7a7599d8aba9d1fdf523f205ca28c3a8c06f00","first_computed_at":"2026-05-18T01:48:16.645708Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:48:16.645708Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Ug+bkklngajXpvNKcjuDs2tsCN0F/xMGMo3zmJU7KKKlBA0BzKO6ioF78bSq2pa833QZgNtirb9M6UdXx44eAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:48:16.646246Z","signed_message":"canonical_sha256_bytes"},"source_id":"1308.2283","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:607422442d0b2bc840564611b3bd6e127919bd523efbfebc80de4c7d66588ffa","sha256:d53dbacd0a6c6f952e888f7baacff8321f38f425cfd1ec20af0666092375b402"],"state_sha256":"f7042dd554fb5f0515f0a5b5894839d41de84661689e1c3ff309df72b61bc399"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4Bvvqugq3RcPKAZPa79xvTsvHwUE792Xhyl4AjxK1RJIXF8wE6Y3HlPGlZ3F+qiK4W2YqiaICOvqwMrFXi7ODA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-26T01:52:12.808552Z","bundle_sha256":"e0b0a58294885b929ba32827fdd7cafcb59272f2d798232ca2d19774e0133baf"}}