{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:IETTLZ47Z4GYTKDC3VM4KZVPDO","short_pith_number":"pith:IETTLZ47","canonical_record":{"source":{"id":"0909.5332","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-09-29T15:16:25Z","cross_cats_sorted":[],"title_canon_sha256":"454a4d18b72961b7a88c9d2f6575d256c6c7e520b7e076820d038e49f99575d1","abstract_canon_sha256":"ef1626d81c5227794a0d90c6bb9bacc53534426e772d014553c4eae32c3bd0c1"},"schema_version":"1.0"},"canonical_sha256":"412735e79fcf0d89a862dd59c566af1b91032e552257f9c83539a041fe9cfd25","source":{"kind":"arxiv","id":"0909.5332","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.5332","created_at":"2026-05-18T03:19:01Z"},{"alias_kind":"arxiv_version","alias_value":"0909.5332v2","created_at":"2026-05-18T03:19:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.5332","created_at":"2026-05-18T03:19:01Z"},{"alias_kind":"pith_short_12","alias_value":"IETTLZ47Z4GY","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"IETTLZ47Z4GYTKDC","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"IETTLZ47","created_at":"2026-05-18T12:26:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:IETTLZ47Z4GYTKDC3VM4KZVPDO","target":"record","payload":{"canonical_record":{"source":{"id":"0909.5332","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-09-29T15:16:25Z","cross_cats_sorted":[],"title_canon_sha256":"454a4d18b72961b7a88c9d2f6575d256c6c7e520b7e076820d038e49f99575d1","abstract_canon_sha256":"ef1626d81c5227794a0d90c6bb9bacc53534426e772d014553c4eae32c3bd0c1"},"schema_version":"1.0"},"canonical_sha256":"412735e79fcf0d89a862dd59c566af1b91032e552257f9c83539a041fe9cfd25","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:19:01.909980Z","signature_b64":"cwkSLfiKCHf0fECf94RIiZcJUePb7eZxKLnyk11zv820GgnrzvkBGq6SfwLVXLTvcY6DlKuj1i9iVDyqYGo0Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"412735e79fcf0d89a862dd59c566af1b91032e552257f9c83539a041fe9cfd25","last_reissued_at":"2026-05-18T03:19:01.909327Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:19:01.909327Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0909.5332","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":"2026-05-18T03:19:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tLvzBxCnGaHFGbcXEcGVQo6TDMlexjNdiEeX+H0KzqAFqg7PMoGL1xf/XNaIsOmFggDBzEaZDyqx2VAiFIS5CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T21:23:31.447499Z"},"content_sha256":"a8d1aff75a6598ef686bd92f9f33c75668f0058afb4f5f9fe3c8a520c2f8027b","schema_version":"1.0","event_id":"sha256:a8d1aff75a6598ef686bd92f9f33c75668f0058afb4f5f9fe3c8a520c2f8027b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:IETTLZ47Z4GYTKDC3VM4KZVPDO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Photospheric high-frequency acoustic power excess in sunspot umbra: signature of magneto-acoustic modes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"M. J. Thompson, R. Erd\\'elyi, S. Shelyag, S. Zharkov, V.Fedun","submitted_at":"2009-09-29T15:16:25Z","abstract_excerpt":"We present observational evidence for the presence of MHD waves in the solar photosphere deduced from SOHO/MDI Dopplergram velocity observations. The magneto-acoustic perturbations are observed as acoustic power enhancement in the sunspot umbra at high-frequency bands in the velocity component perpendicular to the magnetic field. We use numerical modelling of wave propagation through localised non-uniform magnetic field concentration along with the same filtering procedure as applied to the observations to identify the observed waves. Guided by the results of the numerical simulations we class"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.5332","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":"2026-05-18T03:19:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Z7i/M1finWQou6IQmM9ppWl3QIXeMn6HdvyQZcXYo9heg8tQ5Fyck3KU1dxsJ8+GdZsoGs4/JVMmiuMBtN0HDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T21:23:31.447912Z"},"content_sha256":"0e25a625a223492fba0db88378ae5d9a053acec2594304ba0d0ab85dfb7ec9f9","schema_version":"1.0","event_id":"sha256:0e25a625a223492fba0db88378ae5d9a053acec2594304ba0d0ab85dfb7ec9f9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IETTLZ47Z4GYTKDC3VM4KZVPDO/bundle.json","state_url":"https://pith.science/pith/IETTLZ47Z4GYTKDC3VM4KZVPDO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IETTLZ47Z4GYTKDC3VM4KZVPDO/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":"2026-05-25T21:23:31Z","links":{"resolver":"https://pith.science/pith/IETTLZ47Z4GYTKDC3VM4KZVPDO","bundle":"https://pith.science/pith/IETTLZ47Z4GYTKDC3VM4KZVPDO/bundle.json","state":"https://pith.science/pith/IETTLZ47Z4GYTKDC3VM4KZVPDO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IETTLZ47Z4GYTKDC3VM4KZVPDO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:IETTLZ47Z4GYTKDC3VM4KZVPDO","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":"ef1626d81c5227794a0d90c6bb9bacc53534426e772d014553c4eae32c3bd0c1","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-09-29T15:16:25Z","title_canon_sha256":"454a4d18b72961b7a88c9d2f6575d256c6c7e520b7e076820d038e49f99575d1"},"schema_version":"1.0","source":{"id":"0909.5332","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.5332","created_at":"2026-05-18T03:19:01Z"},{"alias_kind":"arxiv_version","alias_value":"0909.5332v2","created_at":"2026-05-18T03:19:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.5332","created_at":"2026-05-18T03:19:01Z"},{"alias_kind":"pith_short_12","alias_value":"IETTLZ47Z4GY","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"IETTLZ47Z4GYTKDC","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"IETTLZ47","created_at":"2026-05-18T12:26:00Z"}],"graph_snapshots":[{"event_id":"sha256:0e25a625a223492fba0db88378ae5d9a053acec2594304ba0d0ab85dfb7ec9f9","target":"graph","created_at":"2026-05-18T03:19:01Z","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 present observational evidence for the presence of MHD waves in the solar photosphere deduced from SOHO/MDI Dopplergram velocity observations. The magneto-acoustic perturbations are observed as acoustic power enhancement in the sunspot umbra at high-frequency bands in the velocity component perpendicular to the magnetic field. We use numerical modelling of wave propagation through localised non-uniform magnetic field concentration along with the same filtering procedure as applied to the observations to identify the observed waves. Guided by the results of the numerical simulations we class","authors_text":"M. J. Thompson, R. Erd\\'elyi, S. Shelyag, S. Zharkov, V.Fedun","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-09-29T15:16:25Z","title":"Photospheric high-frequency acoustic power excess in sunspot umbra: signature of magneto-acoustic modes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.5332","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:a8d1aff75a6598ef686bd92f9f33c75668f0058afb4f5f9fe3c8a520c2f8027b","target":"record","created_at":"2026-05-18T03:19:01Z","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":"ef1626d81c5227794a0d90c6bb9bacc53534426e772d014553c4eae32c3bd0c1","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-09-29T15:16:25Z","title_canon_sha256":"454a4d18b72961b7a88c9d2f6575d256c6c7e520b7e076820d038e49f99575d1"},"schema_version":"1.0","source":{"id":"0909.5332","kind":"arxiv","version":2}},"canonical_sha256":"412735e79fcf0d89a862dd59c566af1b91032e552257f9c83539a041fe9cfd25","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"412735e79fcf0d89a862dd59c566af1b91032e552257f9c83539a041fe9cfd25","first_computed_at":"2026-05-18T03:19:01.909327Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:19:01.909327Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"cwkSLfiKCHf0fECf94RIiZcJUePb7eZxKLnyk11zv820GgnrzvkBGq6SfwLVXLTvcY6DlKuj1i9iVDyqYGo0Bw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:19:01.909980Z","signed_message":"canonical_sha256_bytes"},"source_id":"0909.5332","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a8d1aff75a6598ef686bd92f9f33c75668f0058afb4f5f9fe3c8a520c2f8027b","sha256:0e25a625a223492fba0db88378ae5d9a053acec2594304ba0d0ab85dfb7ec9f9"],"state_sha256":"e7868be9f0f78d5e1d5e9178ce94187d257becc82f054bc92f2409142acf8739"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AOIQ1g7Bfqp4AsZOkM7zbSDSGo8cEeD8fwh5Bco5esD+behtcS6ZNQ5Ft/g5dd9xexHDtztwmITj4/jADlUtCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T21:23:31.451478Z","bundle_sha256":"81be85d36eb05c35947dc04ab69ebaf96b51160db634dc7ac0d0d82805ed7f05"}}