{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:MD6VLZVTEDQPGXSG775BNMJR3R","short_pith_number":"pith:MD6VLZVT","canonical_record":{"source":{"id":"1208.2153","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-08-10T12:09:15Z","cross_cats_sorted":["physics.plasm-ph"],"title_canon_sha256":"7241feafcd8fd43c0555bca2adfabc5b2ea43a017727d74f6c48efc1707cc2cc","abstract_canon_sha256":"bde9a9a8ba8bd8866ef66b2c6b07038fef9da6ab9e7f557700860efe3548e8b2"},"schema_version":"1.0"},"canonical_sha256":"60fd55e6b320e0f35e46fffa16b131dc5863bd99e2095d8a07fef401fa4d5ed5","source":{"kind":"arxiv","id":"1208.2153","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1208.2153","created_at":"2026-05-18T01:13:45Z"},{"alias_kind":"arxiv_version","alias_value":"1208.2153v2","created_at":"2026-05-18T01:13:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1208.2153","created_at":"2026-05-18T01:13:45Z"},{"alias_kind":"pith_short_12","alias_value":"MD6VLZVTEDQP","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_16","alias_value":"MD6VLZVTEDQPGXSG","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_8","alias_value":"MD6VLZVT","created_at":"2026-05-18T12:27:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:MD6VLZVTEDQPGXSG775BNMJR3R","target":"record","payload":{"canonical_record":{"source":{"id":"1208.2153","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-08-10T12:09:15Z","cross_cats_sorted":["physics.plasm-ph"],"title_canon_sha256":"7241feafcd8fd43c0555bca2adfabc5b2ea43a017727d74f6c48efc1707cc2cc","abstract_canon_sha256":"bde9a9a8ba8bd8866ef66b2c6b07038fef9da6ab9e7f557700860efe3548e8b2"},"schema_version":"1.0"},"canonical_sha256":"60fd55e6b320e0f35e46fffa16b131dc5863bd99e2095d8a07fef401fa4d5ed5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:13:45.182251Z","signature_b64":"ELDNZYsExZtFyHvsCf0tGJps/+SbxYXz5Ve0Dx7d7CqVp5bDQeuhmanlSRV9f26AF3D6MJPAp1nZaE7HarVtAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"60fd55e6b320e0f35e46fffa16b131dc5863bd99e2095d8a07fef401fa4d5ed5","last_reissued_at":"2026-05-18T01:13:45.181665Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:13:45.181665Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1208.2153","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:13:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sjE8G3HPiQFImtwwY8rYIHKDIGsPZtRSzinbvvlkVB8gjlBT4ERntSzRgaHTdve/auDo6OBA/FIeZsPGZ6ZPAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T02:31:43.169106Z"},"content_sha256":"88e2899781dccdb3ff09f30370732eb630b33d58327ff1d2c1dd4911d8703334","schema_version":"1.0","event_id":"sha256:88e2899781dccdb3ff09f30370732eb630b33d58327ff1d2c1dd4911d8703334"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:MD6VLZVTEDQPGXSG775BNMJR3R","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Helium Emissions Observed in Ground-Based Spectra of Solar Prominences","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.plasm-ph"],"primary_cat":"astro-ph.SR","authors_text":"Eberhard Wiehr, Goetz Stellmacher, Michele Bianda, Renzo Ramelli","submitted_at":"2012-08-10T12:09:15Z","abstract_excerpt":"The only prominent line of singly ionized helium in the visible spectral range, helium-II 4686 A, is observed together with the helium-I 5015 A singlet and the helium-I 4471 A triplet line in solar prominences. The sodium emission, NaD2, is used as a tracer for helium-II emissions which are sufficiently bright to exceed the noise level near 10^-6 of the disk-center intensity. The so selected prominences are characterized by small non-thermal line broadening and almost absent velocity shifts, yielding narrow line profiles without wiggles. The reduced widths [Delta(lambda_D) / lambda] of helium-"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1208.2153","kind":"arxiv","version":2},"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":"2026-05-18T01:13:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WzhaYNxIZklXIQb58MgLUiGgaRiNEgPW6t+VLQrGQ80Fh6gDc0YGOOM8feEye85Jo9/6ptP8xW2iWsvj7C97CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T02:31:43.169480Z"},"content_sha256":"d2b6a5d0ee63e4e5c8f904f7dd9764c8a0ee4696364b27ad45032abe23e75562","schema_version":"1.0","event_id":"sha256:d2b6a5d0ee63e4e5c8f904f7dd9764c8a0ee4696364b27ad45032abe23e75562"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MD6VLZVTEDQPGXSG775BNMJR3R/bundle.json","state_url":"https://pith.science/pith/MD6VLZVTEDQPGXSG775BNMJR3R/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MD6VLZVTEDQPGXSG775BNMJR3R/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":"2026-06-23T02:31:43Z","links":{"resolver":"https://pith.science/pith/MD6VLZVTEDQPGXSG775BNMJR3R","bundle":"https://pith.science/pith/MD6VLZVTEDQPGXSG775BNMJR3R/bundle.json","state":"https://pith.science/pith/MD6VLZVTEDQPGXSG775BNMJR3R/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MD6VLZVTEDQPGXSG775BNMJR3R/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:MD6VLZVTEDQPGXSG775BNMJR3R","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":"bde9a9a8ba8bd8866ef66b2c6b07038fef9da6ab9e7f557700860efe3548e8b2","cross_cats_sorted":["physics.plasm-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-08-10T12:09:15Z","title_canon_sha256":"7241feafcd8fd43c0555bca2adfabc5b2ea43a017727d74f6c48efc1707cc2cc"},"schema_version":"1.0","source":{"id":"1208.2153","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1208.2153","created_at":"2026-05-18T01:13:45Z"},{"alias_kind":"arxiv_version","alias_value":"1208.2153v2","created_at":"2026-05-18T01:13:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1208.2153","created_at":"2026-05-18T01:13:45Z"},{"alias_kind":"pith_short_12","alias_value":"MD6VLZVTEDQP","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_16","alias_value":"MD6VLZVTEDQPGXSG","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_8","alias_value":"MD6VLZVT","created_at":"2026-05-18T12:27:14Z"}],"graph_snapshots":[{"event_id":"sha256:d2b6a5d0ee63e4e5c8f904f7dd9764c8a0ee4696364b27ad45032abe23e75562","target":"graph","created_at":"2026-05-18T01:13:45Z","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 only prominent line of singly ionized helium in the visible spectral range, helium-II 4686 A, is observed together with the helium-I 5015 A singlet and the helium-I 4471 A triplet line in solar prominences. The sodium emission, NaD2, is used as a tracer for helium-II emissions which are sufficiently bright to exceed the noise level near 10^-6 of the disk-center intensity. The so selected prominences are characterized by small non-thermal line broadening and almost absent velocity shifts, yielding narrow line profiles without wiggles. The reduced widths [Delta(lambda_D) / lambda] of helium-","authors_text":"Eberhard Wiehr, Goetz Stellmacher, Michele Bianda, Renzo Ramelli","cross_cats":["physics.plasm-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-08-10T12:09:15Z","title":"Helium Emissions Observed in Ground-Based Spectra of Solar Prominences"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1208.2153","kind":"arxiv","version":2},"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":"sha256:88e2899781dccdb3ff09f30370732eb630b33d58327ff1d2c1dd4911d8703334","target":"record","created_at":"2026-05-18T01:13:45Z","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":"bde9a9a8ba8bd8866ef66b2c6b07038fef9da6ab9e7f557700860efe3548e8b2","cross_cats_sorted":["physics.plasm-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-08-10T12:09:15Z","title_canon_sha256":"7241feafcd8fd43c0555bca2adfabc5b2ea43a017727d74f6c48efc1707cc2cc"},"schema_version":"1.0","source":{"id":"1208.2153","kind":"arxiv","version":2}},"canonical_sha256":"60fd55e6b320e0f35e46fffa16b131dc5863bd99e2095d8a07fef401fa4d5ed5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"60fd55e6b320e0f35e46fffa16b131dc5863bd99e2095d8a07fef401fa4d5ed5","first_computed_at":"2026-05-18T01:13:45.181665Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:13:45.181665Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ELDNZYsExZtFyHvsCf0tGJps/+SbxYXz5Ve0Dx7d7CqVp5bDQeuhmanlSRV9f26AF3D6MJPAp1nZaE7HarVtAw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:13:45.182251Z","signed_message":"canonical_sha256_bytes"},"source_id":"1208.2153","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:88e2899781dccdb3ff09f30370732eb630b33d58327ff1d2c1dd4911d8703334","sha256:d2b6a5d0ee63e4e5c8f904f7dd9764c8a0ee4696364b27ad45032abe23e75562"],"state_sha256":"e64d8baf744d6b2ff3d38558d2cdfb685aaa83384ecc4d05dbcb78b372b43643"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KYtuLp+TQPXLORoiB+Dcc7RlzT8IQ/Qf8ODpHRUxRxnhm4bSf+ZF3SMSOlfa7eGt8b9v/2C4vXXeom0PRiCNAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-23T02:31:43.171627Z","bundle_sha256":"e53f1e24abded5ad97ec4382e4003fbe1a22c27a9d3b3be5f925276402c2a178"}}