{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:EC4UMDXZOLY5QDDCOKOM6EVHH5","short_pith_number":"pith:EC4UMDXZ","canonical_record":{"source":{"id":"1502.02559","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-02-09T16:52:10Z","cross_cats_sorted":[],"title_canon_sha256":"672dfb626bf1cb7c35518a0cc471e5e971e722354e3e1107b7360301cbf9d240","abstract_canon_sha256":"da10325781e980c04b2a84005bf1675cbeadd66e87d26174e35d41419dec0430"},"schema_version":"1.0"},"canonical_sha256":"20b9460ef972f1d80c62729ccf12a73f5832ea669d77017f5c0a3e41069b7fc9","source":{"kind":"arxiv","id":"1502.02559","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.02559","created_at":"2026-05-18T02:26:46Z"},{"alias_kind":"arxiv_version","alias_value":"1502.02559v1","created_at":"2026-05-18T02:26:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.02559","created_at":"2026-05-18T02:26:46Z"},{"alias_kind":"pith_short_12","alias_value":"EC4UMDXZOLY5","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_16","alias_value":"EC4UMDXZOLY5QDDC","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_8","alias_value":"EC4UMDXZ","created_at":"2026-05-18T12:29:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:EC4UMDXZOLY5QDDCOKOM6EVHH5","target":"record","payload":{"canonical_record":{"source":{"id":"1502.02559","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-02-09T16:52:10Z","cross_cats_sorted":[],"title_canon_sha256":"672dfb626bf1cb7c35518a0cc471e5e971e722354e3e1107b7360301cbf9d240","abstract_canon_sha256":"da10325781e980c04b2a84005bf1675cbeadd66e87d26174e35d41419dec0430"},"schema_version":"1.0"},"canonical_sha256":"20b9460ef972f1d80c62729ccf12a73f5832ea669d77017f5c0a3e41069b7fc9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:26:46.604068Z","signature_b64":"ZZHa7EKXl6gQpafwA8nT6zw+5hofseuiu1iaPBRnOMMyrbOKrxS0PraXSo/9NNJ94ws7xbvgxfIfWlL9tuBuAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"20b9460ef972f1d80c62729ccf12a73f5832ea669d77017f5c0a3e41069b7fc9","last_reissued_at":"2026-05-18T02:26:46.603510Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:26:46.603510Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1502.02559","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":"2026-05-18T02:26:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"X5IAo+pPqa4qEnHLOZmc0NAgKP8vtH/GEXfj2zWnwdJ4OgGmDzCHPciilbg7DVBJNBTVveaEmTaF/Hjb74/QCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T20:08:04.291140Z"},"content_sha256":"3d7e11a652b3b796073ed934a5e401ac8b7660a2c304744e2a2e764edecba89d","schema_version":"1.0","event_id":"sha256:3d7e11a652b3b796073ed934a5e401ac8b7660a2c304744e2a2e764edecba89d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:EC4UMDXZOLY5QDDCOKOM6EVHH5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Understanding the Fe I Line Measurements Returned by the Helioseismic and Magnetic Imager","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Alexandra Tritschler, Daniel P. Cohen, Laurel Farris, Serena Criscuoli","submitted_at":"2015-02-09T16:52:10Z","abstract_excerpt":"The Helioseismic and Magnetic Imager (HMI) aboard the Solar Dynamics Observatory (SDO) observes the Sun at the Fe I 6173 {\\AA} line and returns full-disk maps of line-of-sight (LOS) observables including the magnetic flux density, velocities, Fe I line width, line depth, and continuum intensity. These data are estimated through an algorithm (the MDI-like algorithm, hereafter), which combines observables obtained at six wavelength positions within the Fe I 6173 {\\AA} line. To properly interpret such data it is important to understand any effects of the instrument and the pipeline that generates"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.02559","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":"2026-05-18T02:26:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6VqQCf3JBHLDTMKr1zcGvpaHebSCzPZvsRvMVioJn6lcz05E8KAVC1dlShO+YqXOaPYfYPOJi3l2f0MNCQ9JBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T20:08:04.291864Z"},"content_sha256":"6085340f8685670106eefa4bee755ee15567411e42cf24bd4b59f6dfd258726f","schema_version":"1.0","event_id":"sha256:6085340f8685670106eefa4bee755ee15567411e42cf24bd4b59f6dfd258726f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EC4UMDXZOLY5QDDCOKOM6EVHH5/bundle.json","state_url":"https://pith.science/pith/EC4UMDXZOLY5QDDCOKOM6EVHH5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EC4UMDXZOLY5QDDCOKOM6EVHH5/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":"2026-05-26T20:08:04Z","links":{"resolver":"https://pith.science/pith/EC4UMDXZOLY5QDDCOKOM6EVHH5","bundle":"https://pith.science/pith/EC4UMDXZOLY5QDDCOKOM6EVHH5/bundle.json","state":"https://pith.science/pith/EC4UMDXZOLY5QDDCOKOM6EVHH5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EC4UMDXZOLY5QDDCOKOM6EVHH5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:EC4UMDXZOLY5QDDCOKOM6EVHH5","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":"da10325781e980c04b2a84005bf1675cbeadd66e87d26174e35d41419dec0430","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-02-09T16:52:10Z","title_canon_sha256":"672dfb626bf1cb7c35518a0cc471e5e971e722354e3e1107b7360301cbf9d240"},"schema_version":"1.0","source":{"id":"1502.02559","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.02559","created_at":"2026-05-18T02:26:46Z"},{"alias_kind":"arxiv_version","alias_value":"1502.02559v1","created_at":"2026-05-18T02:26:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.02559","created_at":"2026-05-18T02:26:46Z"},{"alias_kind":"pith_short_12","alias_value":"EC4UMDXZOLY5","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_16","alias_value":"EC4UMDXZOLY5QDDC","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_8","alias_value":"EC4UMDXZ","created_at":"2026-05-18T12:29:19Z"}],"graph_snapshots":[{"event_id":"sha256:6085340f8685670106eefa4bee755ee15567411e42cf24bd4b59f6dfd258726f","target":"graph","created_at":"2026-05-18T02:26:46Z","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":"The Helioseismic and Magnetic Imager (HMI) aboard the Solar Dynamics Observatory (SDO) observes the Sun at the Fe I 6173 {\\AA} line and returns full-disk maps of line-of-sight (LOS) observables including the magnetic flux density, velocities, Fe I line width, line depth, and continuum intensity. These data are estimated through an algorithm (the MDI-like algorithm, hereafter), which combines observables obtained at six wavelength positions within the Fe I 6173 {\\AA} line. To properly interpret such data it is important to understand any effects of the instrument and the pipeline that generates","authors_text":"Alexandra Tritschler, Daniel P. Cohen, Laurel Farris, Serena Criscuoli","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-02-09T16:52:10Z","title":"Understanding the Fe I Line Measurements Returned by the Helioseismic and Magnetic Imager"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.02559","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":"sha256:3d7e11a652b3b796073ed934a5e401ac8b7660a2c304744e2a2e764edecba89d","target":"record","created_at":"2026-05-18T02:26:46Z","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":"da10325781e980c04b2a84005bf1675cbeadd66e87d26174e35d41419dec0430","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-02-09T16:52:10Z","title_canon_sha256":"672dfb626bf1cb7c35518a0cc471e5e971e722354e3e1107b7360301cbf9d240"},"schema_version":"1.0","source":{"id":"1502.02559","kind":"arxiv","version":1}},"canonical_sha256":"20b9460ef972f1d80c62729ccf12a73f5832ea669d77017f5c0a3e41069b7fc9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"20b9460ef972f1d80c62729ccf12a73f5832ea669d77017f5c0a3e41069b7fc9","first_computed_at":"2026-05-18T02:26:46.603510Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:26:46.603510Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ZZHa7EKXl6gQpafwA8nT6zw+5hofseuiu1iaPBRnOMMyrbOKrxS0PraXSo/9NNJ94ws7xbvgxfIfWlL9tuBuAw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:26:46.604068Z","signed_message":"canonical_sha256_bytes"},"source_id":"1502.02559","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3d7e11a652b3b796073ed934a5e401ac8b7660a2c304744e2a2e764edecba89d","sha256:6085340f8685670106eefa4bee755ee15567411e42cf24bd4b59f6dfd258726f"],"state_sha256":"a1345ac7d9e36572c2b192ec13b4c6d85d81765cf92524a454c40161d38f25c1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OP8INg4ngugjBu8QohWJ4/sXbBEQr+9UeCQA03SHfvbikd1ID65IGZOVUPC4pJyeoXqMQj/b5hcSK46GQzLaDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T20:08:04.295436Z","bundle_sha256":"9e64cad8342ce360e032e62a688dad7571c5c177349bdc3676c6b495bc2249c3"}}