{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:2YIKCMZVZRLTCHVI2NQVIXMUIY","short_pith_number":"pith:2YIKCMZV","canonical_record":{"source":{"id":"1108.4527","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-08-23T08:54:04Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"1ae88fd938d0b0d83a25b0026a2d30e96b7a3997f84fe9915b42a0d1683cca87","abstract_canon_sha256":"130604cac648fc59afeabbad4a82e545c3df594bde9c356f35ccef311b254fb5"},"schema_version":"1.0"},"canonical_sha256":"d610a13335cc57311ea8d361545d94462314b136e080ddf0e427b0128e802ba5","source":{"kind":"arxiv","id":"1108.4527","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1108.4527","created_at":"2026-05-18T02:00:49Z"},{"alias_kind":"arxiv_version","alias_value":"1108.4527v2","created_at":"2026-05-18T02:00:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1108.4527","created_at":"2026-05-18T02:00:49Z"},{"alias_kind":"pith_short_12","alias_value":"2YIKCMZVZRLT","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_16","alias_value":"2YIKCMZVZRLTCHVI","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_8","alias_value":"2YIKCMZV","created_at":"2026-05-18T12:26:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:2YIKCMZVZRLTCHVI2NQVIXMUIY","target":"record","payload":{"canonical_record":{"source":{"id":"1108.4527","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-08-23T08:54:04Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"1ae88fd938d0b0d83a25b0026a2d30e96b7a3997f84fe9915b42a0d1683cca87","abstract_canon_sha256":"130604cac648fc59afeabbad4a82e545c3df594bde9c356f35ccef311b254fb5"},"schema_version":"1.0"},"canonical_sha256":"d610a13335cc57311ea8d361545d94462314b136e080ddf0e427b0128e802ba5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:00:49.387302Z","signature_b64":"8574l6mIcwCmJsG9p/u5QMBBH34Gjde/FY1hUqiQcxf8hf6EKoFdLT+4ecccPyXKOLfx71oMAq/UXjodGvBVDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d610a13335cc57311ea8d361545d94462314b136e080ddf0e427b0128e802ba5","last_reissued_at":"2026-05-18T02:00:49.386711Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:00:49.386711Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1108.4527","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":"2026-05-18T02:00:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qgrPvum0fh6XVkfKxP2gIJIdaK4DLxBTLBUAKJvSbrk3qsqsj/M2fgAZtS21/NZxJUQFsINdVMtDQZIBKJ3yBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T13:17:03.757072Z"},"content_sha256":"79fdaaf4d3cda753ab95b00c012806c285edce989120b6dac7239b7b7bad27e5","schema_version":"1.0","event_id":"sha256:79fdaaf4d3cda753ab95b00c012806c285edce989120b6dac7239b7b7bad27e5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:2YIKCMZVZRLTCHVI2NQVIXMUIY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Is the solar spectrum latitude dependent? An investigation with SST/TRIPPEL","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.SR","authors_text":"Bengt Gustafsson, Dan Kiselman, Jorge Mel\\'endez, Kai Langhans, Martin Asplund, Tiago Pereira","submitted_at":"2011-08-23T08:54:04Z","abstract_excerpt":"Context: In studies of the solar spectrum relative to spectra of solar twin stars, it has been found that the chemical composition of the Sun seems to depart systematically from those of the twins. One possible explanation is that the effect is due to the special aspect angle of the Sun when observed from Earth, as compared with the aspect angles of the twins. Thus, a latitude dependence of the solar spectrum, even with the heliocentric angle constant, could lead to effects of the type observed.\n  Aim: We explore a possible variation in the strength of certain spectral lines, used in the compa"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.4527","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":"2026-05-18T02:00:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7Rs2L+pABpSxeEpOHfxpSjnA0EzfL5dcGiKwrADJku7QcYuYuB0lrkkto5LN3caiZb9pk4Oc5mtBo97tMzK0Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T13:17:03.757702Z"},"content_sha256":"adc4943fdb474571f94455d8e30f017a60111523333046d8107115c1a7ad4539","schema_version":"1.0","event_id":"sha256:adc4943fdb474571f94455d8e30f017a60111523333046d8107115c1a7ad4539"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2YIKCMZVZRLTCHVI2NQVIXMUIY/bundle.json","state_url":"https://pith.science/pith/2YIKCMZVZRLTCHVI2NQVIXMUIY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2YIKCMZVZRLTCHVI2NQVIXMUIY/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":"2026-08-18T13:17:03Z","links":{"resolver":"https://pith.science/pith/2YIKCMZVZRLTCHVI2NQVIXMUIY","bundle":"https://pith.science/pith/2YIKCMZVZRLTCHVI2NQVIXMUIY/bundle.json","state":"https://pith.science/pith/2YIKCMZVZRLTCHVI2NQVIXMUIY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2YIKCMZVZRLTCHVI2NQVIXMUIY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:2YIKCMZVZRLTCHVI2NQVIXMUIY","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":"130604cac648fc59afeabbad4a82e545c3df594bde9c356f35ccef311b254fb5","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-08-23T08:54:04Z","title_canon_sha256":"1ae88fd938d0b0d83a25b0026a2d30e96b7a3997f84fe9915b42a0d1683cca87"},"schema_version":"1.0","source":{"id":"1108.4527","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1108.4527","created_at":"2026-05-18T02:00:49Z"},{"alias_kind":"arxiv_version","alias_value":"1108.4527v2","created_at":"2026-05-18T02:00:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1108.4527","created_at":"2026-05-18T02:00:49Z"},{"alias_kind":"pith_short_12","alias_value":"2YIKCMZVZRLT","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_16","alias_value":"2YIKCMZVZRLTCHVI","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_8","alias_value":"2YIKCMZV","created_at":"2026-05-18T12:26:18Z"}],"graph_snapshots":[{"event_id":"sha256:adc4943fdb474571f94455d8e30f017a60111523333046d8107115c1a7ad4539","target":"graph","created_at":"2026-05-18T02:00:49Z","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":"Context: In studies of the solar spectrum relative to spectra of solar twin stars, it has been found that the chemical composition of the Sun seems to depart systematically from those of the twins. One possible explanation is that the effect is due to the special aspect angle of the Sun when observed from Earth, as compared with the aspect angles of the twins. Thus, a latitude dependence of the solar spectrum, even with the heliocentric angle constant, could lead to effects of the type observed.\n  Aim: We explore a possible variation in the strength of certain spectral lines, used in the compa","authors_text":"Bengt Gustafsson, Dan Kiselman, Jorge Mel\\'endez, Kai Langhans, Martin Asplund, Tiago Pereira","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-08-23T08:54:04Z","title":"Is the solar spectrum latitude dependent? An investigation with SST/TRIPPEL"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.4527","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":"sha256:79fdaaf4d3cda753ab95b00c012806c285edce989120b6dac7239b7b7bad27e5","target":"record","created_at":"2026-05-18T02:00:49Z","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":"130604cac648fc59afeabbad4a82e545c3df594bde9c356f35ccef311b254fb5","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-08-23T08:54:04Z","title_canon_sha256":"1ae88fd938d0b0d83a25b0026a2d30e96b7a3997f84fe9915b42a0d1683cca87"},"schema_version":"1.0","source":{"id":"1108.4527","kind":"arxiv","version":2}},"canonical_sha256":"d610a13335cc57311ea8d361545d94462314b136e080ddf0e427b0128e802ba5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d610a13335cc57311ea8d361545d94462314b136e080ddf0e427b0128e802ba5","first_computed_at":"2026-05-18T02:00:49.386711Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:00:49.386711Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8574l6mIcwCmJsG9p/u5QMBBH34Gjde/FY1hUqiQcxf8hf6EKoFdLT+4ecccPyXKOLfx71oMAq/UXjodGvBVDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:00:49.387302Z","signed_message":"canonical_sha256_bytes"},"source_id":"1108.4527","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:79fdaaf4d3cda753ab95b00c012806c285edce989120b6dac7239b7b7bad27e5","sha256:adc4943fdb474571f94455d8e30f017a60111523333046d8107115c1a7ad4539"],"state_sha256":"de176ede2b1081d10330a415bc07ef35aa3879aab6908f337e18f626037c52de"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"R16SLn901aNC8sBNVaf+bYjICTNHZlKGO0KqCM1okxuM3s1R0+b3EfFG3/3ZUrp0dcyCIG0RUaHr9vD4effxAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-18T13:17:03.765278Z","bundle_sha256":"d064c837eefe7a115eb90fae62856afc68e68742c9d324c599a8bddec0332333"}}