{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:IXT2XHBKOFDPNXCIR6LQVCNZLN","short_pith_number":"pith:IXT2XHBK","canonical_record":{"source":{"id":"2108.07802","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.space-ph","submitted_at":"2021-08-17T20:14:02Z","cross_cats_sorted":["astro-ph.SR","physics.plasm-ph"],"title_canon_sha256":"bacc7453afdf4a188a9e24b7c101ba4398ca924da244934c582b64948c42bc71","abstract_canon_sha256":"d4bf01f5e685d2b1f03686d629f2158f5bf5bcaf3964312008e6c07595a8f629"},"schema_version":"1.0"},"canonical_sha256":"45e7ab9c2a7146f6dc488f970a89b95b7e7366c36986487e66aadd1f63420573","source":{"kind":"arxiv","id":"2108.07802","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.07802","created_at":"2026-07-05T03:18:21Z"},{"alias_kind":"arxiv_version","alias_value":"2108.07802v1","created_at":"2026-07-05T03:18:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.07802","created_at":"2026-07-05T03:18:21Z"},{"alias_kind":"pith_short_12","alias_value":"IXT2XHBKOFDP","created_at":"2026-07-05T03:18:21Z"},{"alias_kind":"pith_short_16","alias_value":"IXT2XHBKOFDPNXCI","created_at":"2026-07-05T03:18:21Z"},{"alias_kind":"pith_short_8","alias_value":"IXT2XHBK","created_at":"2026-07-05T03:18:21Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:IXT2XHBKOFDPNXCIR6LQVCNZLN","target":"record","payload":{"canonical_record":{"source":{"id":"2108.07802","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.space-ph","submitted_at":"2021-08-17T20:14:02Z","cross_cats_sorted":["astro-ph.SR","physics.plasm-ph"],"title_canon_sha256":"bacc7453afdf4a188a9e24b7c101ba4398ca924da244934c582b64948c42bc71","abstract_canon_sha256":"d4bf01f5e685d2b1f03686d629f2158f5bf5bcaf3964312008e6c07595a8f629"},"schema_version":"1.0"},"canonical_sha256":"45e7ab9c2a7146f6dc488f970a89b95b7e7366c36986487e66aadd1f63420573","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:18:21.660865Z","signature_b64":"RoRcX+8tvf//mLvegcyCG0HJ3qrxJqf0xyIsXvuRUb/Q0AysZ02c1ysQBEDayyOLyf77iGS60ELN29c7UxxiCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"45e7ab9c2a7146f6dc488f970a89b95b7e7366c36986487e66aadd1f63420573","last_reissued_at":"2026-07-05T03:18:21.660415Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:18:21.660415Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2108.07802","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":"2026-07-05T03:18:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NpZk9Z8+DwX3c2k9B4zNCUHdJw+zDF0NA90+0+fJfdNlLlxDlLOi9zw/8YrogEaMB/cvh1F0ruvDTco+Zky/CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T11:43:14.512368Z"},"content_sha256":"55f3814ad493e6c6b67c3603fb3d7082e880964aafe8ed8614f43f1b7b339baa","schema_version":"1.0","event_id":"sha256:55f3814ad493e6c6b67c3603fb3d7082e880964aafe8ed8614f43f1b7b339baa"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:IXT2XHBKOFDPNXCIR6LQVCNZLN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Triggered ion acoustic waves in the solar wind","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.SR","physics.plasm-ph"],"primary_cat":"physics.space-ph","authors_text":"Forrest S. Mozer, Ivan .Y. Vasko, J. L. Verniero","submitted_at":"2021-08-17T20:14:02Z","abstract_excerpt":"For more than 12 hours beginning on January 18, 2021, continuous narrowband electrostatic emissions were observed on Parker Solar Probe near 20 solar radii. The observed <1000 Hz frequencies were well below the local ion plasma frequency. Surprisingly, the emissions consisted of electrostatic wave packets with shock-like envelopes, appearing repetitively at a ~1.5 Hz rate. This repetitiveness correlated and was in phase with low frequency electromagnetic fluctuations. The emissions were associated with simultaneously observed ion beams and conditions favorable for ion-acoustic wave excitation,"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.07802","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/2108.07802/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":"2026-07-05T03:18:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KgXBw9Ez65bTGjt7yq/3y/FyCqPR81JVASRM0wvV6cNhOoXF2AGX5H2eiTJtPG4LNZOQitTJxg2dDzAueI+cCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T11:43:14.513028Z"},"content_sha256":"9f97525ac7c5706749b4e3f3eb5dc6b0d15756db3b040e6b0f4dba0ee42bb52e","schema_version":"1.0","event_id":"sha256:9f97525ac7c5706749b4e3f3eb5dc6b0d15756db3b040e6b0f4dba0ee42bb52e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IXT2XHBKOFDPNXCIR6LQVCNZLN/bundle.json","state_url":"https://pith.science/pith/IXT2XHBKOFDPNXCIR6LQVCNZLN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IXT2XHBKOFDPNXCIR6LQVCNZLN/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":"2026-07-05T11:43:14Z","links":{"resolver":"https://pith.science/pith/IXT2XHBKOFDPNXCIR6LQVCNZLN","bundle":"https://pith.science/pith/IXT2XHBKOFDPNXCIR6LQVCNZLN/bundle.json","state":"https://pith.science/pith/IXT2XHBKOFDPNXCIR6LQVCNZLN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IXT2XHBKOFDPNXCIR6LQVCNZLN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:IXT2XHBKOFDPNXCIR6LQVCNZLN","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":"d4bf01f5e685d2b1f03686d629f2158f5bf5bcaf3964312008e6c07595a8f629","cross_cats_sorted":["astro-ph.SR","physics.plasm-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.space-ph","submitted_at":"2021-08-17T20:14:02Z","title_canon_sha256":"bacc7453afdf4a188a9e24b7c101ba4398ca924da244934c582b64948c42bc71"},"schema_version":"1.0","source":{"id":"2108.07802","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.07802","created_at":"2026-07-05T03:18:21Z"},{"alias_kind":"arxiv_version","alias_value":"2108.07802v1","created_at":"2026-07-05T03:18:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.07802","created_at":"2026-07-05T03:18:21Z"},{"alias_kind":"pith_short_12","alias_value":"IXT2XHBKOFDP","created_at":"2026-07-05T03:18:21Z"},{"alias_kind":"pith_short_16","alias_value":"IXT2XHBKOFDPNXCI","created_at":"2026-07-05T03:18:21Z"},{"alias_kind":"pith_short_8","alias_value":"IXT2XHBK","created_at":"2026-07-05T03:18:21Z"}],"graph_snapshots":[{"event_id":"sha256:9f97525ac7c5706749b4e3f3eb5dc6b0d15756db3b040e6b0f4dba0ee42bb52e","target":"graph","created_at":"2026-07-05T03:18:21Z","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/2108.07802/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"For more than 12 hours beginning on January 18, 2021, continuous narrowband electrostatic emissions were observed on Parker Solar Probe near 20 solar radii. The observed <1000 Hz frequencies were well below the local ion plasma frequency. Surprisingly, the emissions consisted of electrostatic wave packets with shock-like envelopes, appearing repetitively at a ~1.5 Hz rate. This repetitiveness correlated and was in phase with low frequency electromagnetic fluctuations. The emissions were associated with simultaneously observed ion beams and conditions favorable for ion-acoustic wave excitation,","authors_text":"Forrest S. Mozer, Ivan .Y. Vasko, J. L. Verniero","cross_cats":["astro-ph.SR","physics.plasm-ph"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.space-ph","submitted_at":"2021-08-17T20:14:02Z","title":"Triggered ion acoustic waves in the solar wind"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.07802","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":"sha256:55f3814ad493e6c6b67c3603fb3d7082e880964aafe8ed8614f43f1b7b339baa","target":"record","created_at":"2026-07-05T03:18:21Z","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":"d4bf01f5e685d2b1f03686d629f2158f5bf5bcaf3964312008e6c07595a8f629","cross_cats_sorted":["astro-ph.SR","physics.plasm-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.space-ph","submitted_at":"2021-08-17T20:14:02Z","title_canon_sha256":"bacc7453afdf4a188a9e24b7c101ba4398ca924da244934c582b64948c42bc71"},"schema_version":"1.0","source":{"id":"2108.07802","kind":"arxiv","version":1}},"canonical_sha256":"45e7ab9c2a7146f6dc488f970a89b95b7e7366c36986487e66aadd1f63420573","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"45e7ab9c2a7146f6dc488f970a89b95b7e7366c36986487e66aadd1f63420573","first_computed_at":"2026-07-05T03:18:21.660415Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:18:21.660415Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"RoRcX+8tvf//mLvegcyCG0HJ3qrxJqf0xyIsXvuRUb/Q0AysZ02c1ysQBEDayyOLyf77iGS60ELN29c7UxxiCg==","signature_status":"signed_v1","signed_at":"2026-07-05T03:18:21.660865Z","signed_message":"canonical_sha256_bytes"},"source_id":"2108.07802","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:55f3814ad493e6c6b67c3603fb3d7082e880964aafe8ed8614f43f1b7b339baa","sha256:9f97525ac7c5706749b4e3f3eb5dc6b0d15756db3b040e6b0f4dba0ee42bb52e"],"state_sha256":"2a4dc06e12da9d1ab847fa869905b67f955621f4f8a0adfe767606308ed2f734"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fdIFwtnndqFghoCC/3wjb73kuoyXxLHIh5W+Sg9XcGtdmHmW0tbhRGlGP92uXx6yd5/p0+xKVjuNNvC7EIBhAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T11:43:14.516032Z","bundle_sha256":"776d59ede4b6b088ffcf5ef8d90b48a14e5201a5adb54be8766f20b301a213b2"}}