{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:PNQKZIJNUMZMXI7XOJJFPHGPLE","short_pith_number":"pith:PNQKZIJN","canonical_record":{"source":{"id":"1908.07866","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-08-21T13:35:16Z","cross_cats_sorted":[],"title_canon_sha256":"8c5e481c7344bccf5d4db01c36e81340a9810b935b7358ea33a09742dacc2d9d","abstract_canon_sha256":"47e44712442a992c4a861ad1237776820adb5f0c0628305cba4cfd498b4a9437"},"schema_version":"1.0"},"canonical_sha256":"7b60aca12da332cba3f77252579ccf592d5a037bba929982a09f00326f44cd8c","source":{"kind":"arxiv","id":"1908.07866","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.07866","created_at":"2026-07-04T23:59:01Z"},{"alias_kind":"arxiv_version","alias_value":"1908.07866v1","created_at":"2026-07-04T23:59:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.07866","created_at":"2026-07-04T23:59:01Z"},{"alias_kind":"pith_short_12","alias_value":"PNQKZIJNUMZM","created_at":"2026-07-04T23:59:01Z"},{"alias_kind":"pith_short_16","alias_value":"PNQKZIJNUMZMXI7X","created_at":"2026-07-04T23:59:01Z"},{"alias_kind":"pith_short_8","alias_value":"PNQKZIJN","created_at":"2026-07-04T23:59:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:PNQKZIJNUMZMXI7XOJJFPHGPLE","target":"record","payload":{"canonical_record":{"source":{"id":"1908.07866","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-08-21T13:35:16Z","cross_cats_sorted":[],"title_canon_sha256":"8c5e481c7344bccf5d4db01c36e81340a9810b935b7358ea33a09742dacc2d9d","abstract_canon_sha256":"47e44712442a992c4a861ad1237776820adb5f0c0628305cba4cfd498b4a9437"},"schema_version":"1.0"},"canonical_sha256":"7b60aca12da332cba3f77252579ccf592d5a037bba929982a09f00326f44cd8c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:59:01.976260Z","signature_b64":"oQHwUOPM8PEtcvyPI6dkpAY5I3XTwIrOCT7B7JAlaEOrcdHXHy7NquASfAa5ctQBnfD/no/Cjuv/tv/mxGE4AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7b60aca12da332cba3f77252579ccf592d5a037bba929982a09f00326f44cd8c","last_reissued_at":"2026-07-04T23:59:01.975836Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:59:01.975836Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.07866","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":"2026-07-04T23:59:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Z27polne2cThpcmO2+8fCLQoy1XFdESGyLOGE3JL1DK911NJ3NiE1eddgURfVw5z4gJXxWu249tveDNV6wjuDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T03:42:33.396366Z"},"content_sha256":"c236a32706ceadb773d84728f3126f5054d0674d8269d248f7518116cc2c38fd","schema_version":"1.0","event_id":"sha256:c236a32706ceadb773d84728f3126f5054d0674d8269d248f7518116cc2c38fd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:PNQKZIJNUMZMXI7XOJJFPHGPLE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An atlas of coronal electron density at 5Rs II: A spherical harmonic method for density reconstruction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Huw Morgan","submitted_at":"2019-08-21T13:35:16Z","abstract_excerpt":"This is the second of a series of three papers that present a methodology with the aim of creating a set of maps of the coronal density over a period of many years. This paper describes a method for reconstructing the coronal electron density based on spherical harmonics. By assuming a radial structure to the corona at the height of interest, line-of-sight integrations can be made individually on each harmonic basis prior to determining coefficients, i.e. the computationally-expensive integrations are calculated only once during initialization. This approach reduces the problem to finding the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.07866","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/1908.07866/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":"2026-07-04T23:59:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SSFRUC9ZktmrU8w79vdpMBq1GK3afObnm3w/CGLOb1vEirPtEmGM099t/ftWHS0A/ZbEcRfomfO1mQxfmMi7BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T03:42:33.396933Z"},"content_sha256":"23f2fa8dfc640a80684220253e6aa4eec2ab29c8143d43a433948ea8ec7c31d7","schema_version":"1.0","event_id":"sha256:23f2fa8dfc640a80684220253e6aa4eec2ab29c8143d43a433948ea8ec7c31d7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PNQKZIJNUMZMXI7XOJJFPHGPLE/bundle.json","state_url":"https://pith.science/pith/PNQKZIJNUMZMXI7XOJJFPHGPLE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PNQKZIJNUMZMXI7XOJJFPHGPLE/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":"2026-08-16T03:42:33Z","links":{"resolver":"https://pith.science/pith/PNQKZIJNUMZMXI7XOJJFPHGPLE","bundle":"https://pith.science/pith/PNQKZIJNUMZMXI7XOJJFPHGPLE/bundle.json","state":"https://pith.science/pith/PNQKZIJNUMZMXI7XOJJFPHGPLE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PNQKZIJNUMZMXI7XOJJFPHGPLE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:PNQKZIJNUMZMXI7XOJJFPHGPLE","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":"47e44712442a992c4a861ad1237776820adb5f0c0628305cba4cfd498b4a9437","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-08-21T13:35:16Z","title_canon_sha256":"8c5e481c7344bccf5d4db01c36e81340a9810b935b7358ea33a09742dacc2d9d"},"schema_version":"1.0","source":{"id":"1908.07866","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.07866","created_at":"2026-07-04T23:59:01Z"},{"alias_kind":"arxiv_version","alias_value":"1908.07866v1","created_at":"2026-07-04T23:59:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.07866","created_at":"2026-07-04T23:59:01Z"},{"alias_kind":"pith_short_12","alias_value":"PNQKZIJNUMZM","created_at":"2026-07-04T23:59:01Z"},{"alias_kind":"pith_short_16","alias_value":"PNQKZIJNUMZMXI7X","created_at":"2026-07-04T23:59:01Z"},{"alias_kind":"pith_short_8","alias_value":"PNQKZIJN","created_at":"2026-07-04T23:59:01Z"}],"graph_snapshots":[{"event_id":"sha256:23f2fa8dfc640a80684220253e6aa4eec2ab29c8143d43a433948ea8ec7c31d7","target":"graph","created_at":"2026-07-04T23:59:01Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1908.07866/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This is the second of a series of three papers that present a methodology with the aim of creating a set of maps of the coronal density over a period of many years. This paper describes a method for reconstructing the coronal electron density based on spherical harmonics. By assuming a radial structure to the corona at the height of interest, line-of-sight integrations can be made individually on each harmonic basis prior to determining coefficients, i.e. the computationally-expensive integrations are calculated only once during initialization. This approach reduces the problem to finding the ","authors_text":"Huw Morgan","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-08-21T13:35:16Z","title":"An atlas of coronal electron density at 5Rs II: A spherical harmonic method for density reconstruction"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.07866","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:c236a32706ceadb773d84728f3126f5054d0674d8269d248f7518116cc2c38fd","target":"record","created_at":"2026-07-04T23:59:01Z","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":"47e44712442a992c4a861ad1237776820adb5f0c0628305cba4cfd498b4a9437","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-08-21T13:35:16Z","title_canon_sha256":"8c5e481c7344bccf5d4db01c36e81340a9810b935b7358ea33a09742dacc2d9d"},"schema_version":"1.0","source":{"id":"1908.07866","kind":"arxiv","version":1}},"canonical_sha256":"7b60aca12da332cba3f77252579ccf592d5a037bba929982a09f00326f44cd8c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7b60aca12da332cba3f77252579ccf592d5a037bba929982a09f00326f44cd8c","first_computed_at":"2026-07-04T23:59:01.975836Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:59:01.975836Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"oQHwUOPM8PEtcvyPI6dkpAY5I3XTwIrOCT7B7JAlaEOrcdHXHy7NquASfAa5ctQBnfD/no/Cjuv/tv/mxGE4AQ==","signature_status":"signed_v1","signed_at":"2026-07-04T23:59:01.976260Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.07866","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c236a32706ceadb773d84728f3126f5054d0674d8269d248f7518116cc2c38fd","sha256:23f2fa8dfc640a80684220253e6aa4eec2ab29c8143d43a433948ea8ec7c31d7"],"state_sha256":"5c25085f3dde2a940bcbe9d01d81228ed11e475fcb8a539778127d0deab1ca92"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PB0X6KCBBuT1q7Fc9zrN8eTp+HEgCIzIQkNL+GsLLZrUMNly4dAFekizjFrWed//+D5BRp1tqHr5roQd2g6fDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T03:42:33.401381Z","bundle_sha256":"e34ff24b532c5a64d2aa6fdc48f197ed7ae813bee429e4e99944c585e9c284ee"}}