{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:XC6VLKSJFLQPKPG4XX5YH4OCO2","short_pith_number":"pith:XC6VLKSJ","canonical_record":{"source":{"id":"2109.02971","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-09-07T09:52:57Z","cross_cats_sorted":[],"title_canon_sha256":"80aeeaa28d774d26c246c6cf77410470cbe01f71a2d453b527f379fd1c9abd6f","abstract_canon_sha256":"eb6d4eaedbc77ede6eb53a2644c5934b15a4aa54edc8e164facd592a4e9a5e29"},"schema_version":"1.0"},"canonical_sha256":"b8bd55aa492ae0f53cdcbdfb83f1c276b92ecad114be3f11007d5c26bbe46043","source":{"kind":"arxiv","id":"2109.02971","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.02971","created_at":"2026-07-05T03:38:32Z"},{"alias_kind":"arxiv_version","alias_value":"2109.02971v1","created_at":"2026-07-05T03:38:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.02971","created_at":"2026-07-05T03:38:32Z"},{"alias_kind":"pith_short_12","alias_value":"XC6VLKSJFLQP","created_at":"2026-07-05T03:38:32Z"},{"alias_kind":"pith_short_16","alias_value":"XC6VLKSJFLQPKPG4","created_at":"2026-07-05T03:38:32Z"},{"alias_kind":"pith_short_8","alias_value":"XC6VLKSJ","created_at":"2026-07-05T03:38:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:XC6VLKSJFLQPKPG4XX5YH4OCO2","target":"record","payload":{"canonical_record":{"source":{"id":"2109.02971","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-09-07T09:52:57Z","cross_cats_sorted":[],"title_canon_sha256":"80aeeaa28d774d26c246c6cf77410470cbe01f71a2d453b527f379fd1c9abd6f","abstract_canon_sha256":"eb6d4eaedbc77ede6eb53a2644c5934b15a4aa54edc8e164facd592a4e9a5e29"},"schema_version":"1.0"},"canonical_sha256":"b8bd55aa492ae0f53cdcbdfb83f1c276b92ecad114be3f11007d5c26bbe46043","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:38:32.094671Z","signature_b64":"8VFhGfpd6uUVzBVEAUayqrYAYW/kHFXpDcbPYEz76cOTaCjH3tJSOnglxaJuIOKvXlf9+3HhYHfEYoe1CYRQDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b8bd55aa492ae0f53cdcbdfb83f1c276b92ecad114be3f11007d5c26bbe46043","last_reissued_at":"2026-07-05T03:38:32.094205Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:38:32.094205Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2109.02971","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":"2026-07-05T03:38:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UzgE2myYepQY+3g0eoZs+lcytUi20fZM3HyFL2dno/McqZ0rfsGvu41NKrruGl2tgRyoKjIaCY8CFAZMmzXFCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T17:33:29.956378Z"},"content_sha256":"abb4d91e33492ef339159774386fae7730bcdb242c4c0fb94a6a518e775503f7","schema_version":"1.0","event_id":"sha256:abb4d91e33492ef339159774386fae7730bcdb242c4c0fb94a6a518e775503f7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:XC6VLKSJFLQPKPG4XX5YH4OCO2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Acoustic wave properties in footpoints of coronal loops in 3D MHD simulations","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Antonino Petralia, Fabio Reale, Julia M. Riedl, Marcel Goossens, Paolo Pagano, Tom Van Doorsselaere","submitted_at":"2021-09-07T09:52:57Z","abstract_excerpt":"Acoustic waves excited in the photosphere and below might play an integral part in the heating of the solar chromosphere and corona. However, it is yet not fully clear how much of the initially acoustic wave flux reaches the corona and in what form. We investigate the wave propagation, damping, transmission, and conversion in the lower layers of the solar atmosphere using 3D numerical MHD simulations. A model of a gravitationally stratified expanding straight coronal loop, stretching from photosphere to photosphere, is perturbed at one footpoint by an acoustic driver with a period of 370 secon"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.02971","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2109.02971/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T03:38:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QVJ+dbtLIgv+kPiWOLkr3kRZRqB8Hnv04GWx6FvLdTPxfegw9pBGFftwAwXscfmd0MxScqYSQJlJHluv7JFIBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T17:33:29.956779Z"},"content_sha256":"6ba0ee8685ba5cb78177abe3577adfd59a35d1583171c772dded93f4204e8898","schema_version":"1.0","event_id":"sha256:6ba0ee8685ba5cb78177abe3577adfd59a35d1583171c772dded93f4204e8898"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XC6VLKSJFLQPKPG4XX5YH4OCO2/bundle.json","state_url":"https://pith.science/pith/XC6VLKSJFLQPKPG4XX5YH4OCO2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XC6VLKSJFLQPKPG4XX5YH4OCO2/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":"2026-08-13T17:33:29Z","links":{"resolver":"https://pith.science/pith/XC6VLKSJFLQPKPG4XX5YH4OCO2","bundle":"https://pith.science/pith/XC6VLKSJFLQPKPG4XX5YH4OCO2/bundle.json","state":"https://pith.science/pith/XC6VLKSJFLQPKPG4XX5YH4OCO2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XC6VLKSJFLQPKPG4XX5YH4OCO2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:XC6VLKSJFLQPKPG4XX5YH4OCO2","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":"eb6d4eaedbc77ede6eb53a2644c5934b15a4aa54edc8e164facd592a4e9a5e29","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-09-07T09:52:57Z","title_canon_sha256":"80aeeaa28d774d26c246c6cf77410470cbe01f71a2d453b527f379fd1c9abd6f"},"schema_version":"1.0","source":{"id":"2109.02971","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.02971","created_at":"2026-07-05T03:38:32Z"},{"alias_kind":"arxiv_version","alias_value":"2109.02971v1","created_at":"2026-07-05T03:38:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.02971","created_at":"2026-07-05T03:38:32Z"},{"alias_kind":"pith_short_12","alias_value":"XC6VLKSJFLQP","created_at":"2026-07-05T03:38:32Z"},{"alias_kind":"pith_short_16","alias_value":"XC6VLKSJFLQPKPG4","created_at":"2026-07-05T03:38:32Z"},{"alias_kind":"pith_short_8","alias_value":"XC6VLKSJ","created_at":"2026-07-05T03:38:32Z"}],"graph_snapshots":[{"event_id":"sha256:6ba0ee8685ba5cb78177abe3577adfd59a35d1583171c772dded93f4204e8898","target":"graph","created_at":"2026-07-05T03:38:32Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2109.02971/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Acoustic waves excited in the photosphere and below might play an integral part in the heating of the solar chromosphere and corona. However, it is yet not fully clear how much of the initially acoustic wave flux reaches the corona and in what form. We investigate the wave propagation, damping, transmission, and conversion in the lower layers of the solar atmosphere using 3D numerical MHD simulations. A model of a gravitationally stratified expanding straight coronal loop, stretching from photosphere to photosphere, is perturbed at one footpoint by an acoustic driver with a period of 370 secon","authors_text":"Antonino Petralia, Fabio Reale, Julia M. Riedl, Marcel Goossens, Paolo Pagano, Tom Van Doorsselaere","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-09-07T09:52:57Z","title":"Acoustic wave properties in footpoints of coronal loops in 3D MHD simulations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.02971","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:abb4d91e33492ef339159774386fae7730bcdb242c4c0fb94a6a518e775503f7","target":"record","created_at":"2026-07-05T03:38:32Z","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":"eb6d4eaedbc77ede6eb53a2644c5934b15a4aa54edc8e164facd592a4e9a5e29","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-09-07T09:52:57Z","title_canon_sha256":"80aeeaa28d774d26c246c6cf77410470cbe01f71a2d453b527f379fd1c9abd6f"},"schema_version":"1.0","source":{"id":"2109.02971","kind":"arxiv","version":1}},"canonical_sha256":"b8bd55aa492ae0f53cdcbdfb83f1c276b92ecad114be3f11007d5c26bbe46043","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b8bd55aa492ae0f53cdcbdfb83f1c276b92ecad114be3f11007d5c26bbe46043","first_computed_at":"2026-07-05T03:38:32.094205Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:38:32.094205Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8VFhGfpd6uUVzBVEAUayqrYAYW/kHFXpDcbPYEz76cOTaCjH3tJSOnglxaJuIOKvXlf9+3HhYHfEYoe1CYRQDA==","signature_status":"signed_v1","signed_at":"2026-07-05T03:38:32.094671Z","signed_message":"canonical_sha256_bytes"},"source_id":"2109.02971","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:abb4d91e33492ef339159774386fae7730bcdb242c4c0fb94a6a518e775503f7","sha256:6ba0ee8685ba5cb78177abe3577adfd59a35d1583171c772dded93f4204e8898"],"state_sha256":"a1f418270553e8787b70e85b89f28530518211944a475356079078703094ec27"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VxnaqbFBLfPgaCbScFsMARJnK8zrS2Aae6gl2slXk7NxNZEZL+fmG891jtcBictImdR1GtPF4IjYoCnW5S/dBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-13T17:33:29.961137Z","bundle_sha256":"8f43b208ba86d0ab740f3cc845161944527d3f3f4e1b98151c0a1f5c5e92c70f"}}