{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:O2MZK3SPKXWJYWEXQICW22XHZY","short_pith_number":"pith:O2MZK3SP","canonical_record":{"source":{"id":"1804.10138","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-04-26T16:08:44Z","cross_cats_sorted":[],"title_canon_sha256":"7fefadb8b0bad88118c086ec9188cdb50e76546f1bde6022ae954286f188c8a4","abstract_canon_sha256":"df2ba449e21cdc4052000548426694f20ac9b2da5fd72813a8cc107a08bcecae"},"schema_version":"1.0"},"canonical_sha256":"7699956e4f55ec9c589782056d6ae7ce36e8d7bf12c280b92ce64c5fff1683e7","source":{"kind":"arxiv","id":"1804.10138","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.10138","created_at":"2026-05-18T00:12:17Z"},{"alias_kind":"arxiv_version","alias_value":"1804.10138v1","created_at":"2026-05-18T00:12:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.10138","created_at":"2026-05-18T00:12:17Z"},{"alias_kind":"pith_short_12","alias_value":"O2MZK3SPKXWJ","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"O2MZK3SPKXWJYWEX","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"O2MZK3SP","created_at":"2026-05-18T12:32:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:O2MZK3SPKXWJYWEXQICW22XHZY","target":"record","payload":{"canonical_record":{"source":{"id":"1804.10138","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-04-26T16:08:44Z","cross_cats_sorted":[],"title_canon_sha256":"7fefadb8b0bad88118c086ec9188cdb50e76546f1bde6022ae954286f188c8a4","abstract_canon_sha256":"df2ba449e21cdc4052000548426694f20ac9b2da5fd72813a8cc107a08bcecae"},"schema_version":"1.0"},"canonical_sha256":"7699956e4f55ec9c589782056d6ae7ce36e8d7bf12c280b92ce64c5fff1683e7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:12:17.309756Z","signature_b64":"EoxZqaChyb0r+Dr6qeZd89hTGIz7a1L8odT208OJ7pbA0EIvZWrVOLuCzBDqnOen8QFSIQD1eFogTiYMOFkDCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7699956e4f55ec9c589782056d6ae7ce36e8d7bf12c280b92ce64c5fff1683e7","last_reissued_at":"2026-05-18T00:12:17.308886Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:12:17.308886Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1804.10138","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":"2026-05-18T00:12:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fEGj3JYom7OV4bmvMvAxqnUKMYjiUw5LHKW7AXMGAl7MYo6br+4xj59ScroHvnzR8zZR1hNMpDFcVPaa896kDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T20:41:56.390399Z"},"content_sha256":"64b77374c555c5fb4d32733156620d968bba90b4464e3eed8a95da906f7b1f5b","schema_version":"1.0","event_id":"sha256:64b77374c555c5fb4d32733156620d968bba90b4464e3eed8a95da906f7b1f5b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:O2MZK3SPKXWJYWEXQICW22XHZY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Density Fluctuations in a Polar Coronal Hole","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Daniel Wolf Savin, Elke D'Huys, Michael Hahn","submitted_at":"2018-04-26T16:08:44Z","abstract_excerpt":"We have measured the root-mean-square (RMS) amplitude of intensity fluctuations, $\\Delta I$, in plume and interplume regions of a polar coronal hole. These intensity fluctuations correspond to density fluctuations. Using data from the \\rev{Sun Watcher using Active Pixel System detector and Image Processing} (SWAP) on \\textit{Project for Onboard Autonomy (Proba2)}, our results extend up to a height of about 1.35~$R_{\\sun}$. One advantage of the RMS analysis is that it does not rely on a detailed evaluation of the power spectrum, which is limited by noise levels to low heights in the corona. The"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.10138","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":""},"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":"2026-05-18T00:12:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"t+UQOBzo6J0kRTo1zbDKUa58BVD3nQgIk1Myn/7Kpi7NEN265M73WhZk+3mPH4edzyt2uq9sWykwUB5XtZ8YCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T20:41:56.391090Z"},"content_sha256":"b3832d9cfde4b9e8e5fcd23ef40a7963ae3353b4460274e74f2e269e23af1896","schema_version":"1.0","event_id":"sha256:b3832d9cfde4b9e8e5fcd23ef40a7963ae3353b4460274e74f2e269e23af1896"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/O2MZK3SPKXWJYWEXQICW22XHZY/bundle.json","state_url":"https://pith.science/pith/O2MZK3SPKXWJYWEXQICW22XHZY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/O2MZK3SPKXWJYWEXQICW22XHZY/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":"2026-05-28T20:41:56Z","links":{"resolver":"https://pith.science/pith/O2MZK3SPKXWJYWEXQICW22XHZY","bundle":"https://pith.science/pith/O2MZK3SPKXWJYWEXQICW22XHZY/bundle.json","state":"https://pith.science/pith/O2MZK3SPKXWJYWEXQICW22XHZY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/O2MZK3SPKXWJYWEXQICW22XHZY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:O2MZK3SPKXWJYWEXQICW22XHZY","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":"df2ba449e21cdc4052000548426694f20ac9b2da5fd72813a8cc107a08bcecae","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-04-26T16:08:44Z","title_canon_sha256":"7fefadb8b0bad88118c086ec9188cdb50e76546f1bde6022ae954286f188c8a4"},"schema_version":"1.0","source":{"id":"1804.10138","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.10138","created_at":"2026-05-18T00:12:17Z"},{"alias_kind":"arxiv_version","alias_value":"1804.10138v1","created_at":"2026-05-18T00:12:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.10138","created_at":"2026-05-18T00:12:17Z"},{"alias_kind":"pith_short_12","alias_value":"O2MZK3SPKXWJ","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"O2MZK3SPKXWJYWEX","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"O2MZK3SP","created_at":"2026-05-18T12:32:40Z"}],"graph_snapshots":[{"event_id":"sha256:b3832d9cfde4b9e8e5fcd23ef40a7963ae3353b4460274e74f2e269e23af1896","target":"graph","created_at":"2026-05-18T00:12:17Z","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 have measured the root-mean-square (RMS) amplitude of intensity fluctuations, $\\Delta I$, in plume and interplume regions of a polar coronal hole. These intensity fluctuations correspond to density fluctuations. Using data from the \\rev{Sun Watcher using Active Pixel System detector and Image Processing} (SWAP) on \\textit{Project for Onboard Autonomy (Proba2)}, our results extend up to a height of about 1.35~$R_{\\sun}$. One advantage of the RMS analysis is that it does not rely on a detailed evaluation of the power spectrum, which is limited by noise levels to low heights in the corona. The","authors_text":"Daniel Wolf Savin, Elke D'Huys, Michael Hahn","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-04-26T16:08:44Z","title":"Density Fluctuations in a Polar Coronal Hole"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.10138","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":"sha256:64b77374c555c5fb4d32733156620d968bba90b4464e3eed8a95da906f7b1f5b","target":"record","created_at":"2026-05-18T00:12:17Z","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":"df2ba449e21cdc4052000548426694f20ac9b2da5fd72813a8cc107a08bcecae","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-04-26T16:08:44Z","title_canon_sha256":"7fefadb8b0bad88118c086ec9188cdb50e76546f1bde6022ae954286f188c8a4"},"schema_version":"1.0","source":{"id":"1804.10138","kind":"arxiv","version":1}},"canonical_sha256":"7699956e4f55ec9c589782056d6ae7ce36e8d7bf12c280b92ce64c5fff1683e7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7699956e4f55ec9c589782056d6ae7ce36e8d7bf12c280b92ce64c5fff1683e7","first_computed_at":"2026-05-18T00:12:17.308886Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:12:17.308886Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"EoxZqaChyb0r+Dr6qeZd89hTGIz7a1L8odT208OJ7pbA0EIvZWrVOLuCzBDqnOen8QFSIQD1eFogTiYMOFkDCg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:12:17.309756Z","signed_message":"canonical_sha256_bytes"},"source_id":"1804.10138","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:64b77374c555c5fb4d32733156620d968bba90b4464e3eed8a95da906f7b1f5b","sha256:b3832d9cfde4b9e8e5fcd23ef40a7963ae3353b4460274e74f2e269e23af1896"],"state_sha256":"e559b6fc1ac5d5c4aca0d85b12f868f0c0beea991297fa496a60b05cb305d31f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+t2W3WUpVtwOPgvXt66LPy8Lbp6MKgH5FbIiqUHsT/FtfAYmY9wGdeC/WVHgl1cyc2kx3TAwUYc05wSp1XLxDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T20:41:56.394972Z","bundle_sha256":"31d8bc1ef04918fe887f9a295296f29b021c700c9f9ae259995ac13ec09794f1"}}