{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1996:BOAUBSPLDJAXNOJWKG5BFNQY7W","short_pith_number":"pith:BOAUBSPL","canonical_record":{"source":{"id":"astro-ph/9610140","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1996-10-18T13:31:29Z","cross_cats_sorted":[],"title_canon_sha256":"de459c98102fcc70f6b594111daa8ffff3c480503aeeb5dc771b57aa6119d4b1","abstract_canon_sha256":"03bd518b2c3ae13a08629d2c3f078152ba116e443c38c49084db4ae75ce20bdd"},"schema_version":"1.0"},"canonical_sha256":"0b8140c9eb1a4176b93651ba12b618fd8505e22ad150a985e6badecd379a6326","source":{"kind":"arxiv","id":"astro-ph/9610140","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9610140","created_at":"2026-07-04T16:00:16Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9610140v1","created_at":"2026-07-04T16:00:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9610140","created_at":"2026-07-04T16:00:16Z"},{"alias_kind":"pith_short_12","alias_value":"BOAUBSPLDJAX","created_at":"2026-07-04T16:00:16Z"},{"alias_kind":"pith_short_16","alias_value":"BOAUBSPLDJAXNOJW","created_at":"2026-07-04T16:00:16Z"},{"alias_kind":"pith_short_8","alias_value":"BOAUBSPL","created_at":"2026-07-04T16:00:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1996:BOAUBSPLDJAXNOJWKG5BFNQY7W","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/9610140","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1996-10-18T13:31:29Z","cross_cats_sorted":[],"title_canon_sha256":"de459c98102fcc70f6b594111daa8ffff3c480503aeeb5dc771b57aa6119d4b1","abstract_canon_sha256":"03bd518b2c3ae13a08629d2c3f078152ba116e443c38c49084db4ae75ce20bdd"},"schema_version":"1.0"},"canonical_sha256":"0b8140c9eb1a4176b93651ba12b618fd8505e22ad150a985e6badecd379a6326","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:00:16.885257Z","signature_b64":"gXIR8rb/Vo32/IvFiSYy99eNIEvYis+lpeDVH2wndNJgB7fVBh78jUpYpYKUpGTScHS56RJHrUxWPPeMcIm1AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0b8140c9eb1a4176b93651ba12b618fd8505e22ad150a985e6badecd379a6326","last_reissued_at":"2026-07-04T16:00:16.884843Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:00:16.884843Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/9610140","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":"2026-07-04T16:00:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1zgoS7CDbiW2MyIViAWEwnDfwdnqpcL+OSaX0dbQQKM1nM4cArLqLGPxBrcYRo/a4IyEDP5ZXNgnpN9N+2sJBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T00:41:46.545116Z"},"content_sha256":"46bd8eb5bd2027166650543a86657562a72412f1734e6ca8fa1ca5020512cd69","schema_version":"1.0","event_id":"sha256:46bd8eb5bd2027166650543a86657562a72412f1734e6ca8fa1ca5020512cd69"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1996:BOAUBSPLDJAXNOJWKG5BFNQY7W","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Accurate Hydrogen Spectral Simulations with a Compact Model Atom","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Gary J. Ferland, Jason W. Ferguson","submitted_at":"1996-10-18T13:31:29Z","abstract_excerpt":"Many large scale numerical simulations of astrophysical plasmas must also reproduce the hydrogen ionization and the resulting emission spectrum, in some cases quite accurately. We describe a compact model hydrogen atom that can be readily incorporated into such simulations. It reproduces the recombination efficiency and line spectrum predicted by much larger calculations for a very broad range of densities and temperatures. Uncertainties in hydrogen collision data are the largest source of differences between our compact atom and predictions of more extensive calculations, and underscore the n"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9610140","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/astro-ph/9610140/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":"2026-07-04T16:00:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5Y8SHeq8L0byNU9SEewKz6vsn17aX+XBHdKXkxYUL51ynH3e7Mub7MlC4FdY068YdwVr7PbMTY/qlvYG51USAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T00:41:46.546092Z"},"content_sha256":"71b9e7fd17685ace24915bb8c538ac7c1bd0d9af0a115f8e24aa2d06f0ff6381","schema_version":"1.0","event_id":"sha256:71b9e7fd17685ace24915bb8c538ac7c1bd0d9af0a115f8e24aa2d06f0ff6381"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BOAUBSPLDJAXNOJWKG5BFNQY7W/bundle.json","state_url":"https://pith.science/pith/BOAUBSPLDJAXNOJWKG5BFNQY7W/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BOAUBSPLDJAXNOJWKG5BFNQY7W/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":"2026-08-04T00:41:46Z","links":{"resolver":"https://pith.science/pith/BOAUBSPLDJAXNOJWKG5BFNQY7W","bundle":"https://pith.science/pith/BOAUBSPLDJAXNOJWKG5BFNQY7W/bundle.json","state":"https://pith.science/pith/BOAUBSPLDJAXNOJWKG5BFNQY7W/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BOAUBSPLDJAXNOJWKG5BFNQY7W/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1996:BOAUBSPLDJAXNOJWKG5BFNQY7W","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":"03bd518b2c3ae13a08629d2c3f078152ba116e443c38c49084db4ae75ce20bdd","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1996-10-18T13:31:29Z","title_canon_sha256":"de459c98102fcc70f6b594111daa8ffff3c480503aeeb5dc771b57aa6119d4b1"},"schema_version":"1.0","source":{"id":"astro-ph/9610140","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9610140","created_at":"2026-07-04T16:00:16Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9610140v1","created_at":"2026-07-04T16:00:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9610140","created_at":"2026-07-04T16:00:16Z"},{"alias_kind":"pith_short_12","alias_value":"BOAUBSPLDJAX","created_at":"2026-07-04T16:00:16Z"},{"alias_kind":"pith_short_16","alias_value":"BOAUBSPLDJAXNOJW","created_at":"2026-07-04T16:00:16Z"},{"alias_kind":"pith_short_8","alias_value":"BOAUBSPL","created_at":"2026-07-04T16:00:16Z"}],"graph_snapshots":[{"event_id":"sha256:71b9e7fd17685ace24915bb8c538ac7c1bd0d9af0a115f8e24aa2d06f0ff6381","target":"graph","created_at":"2026-07-04T16:00:16Z","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/astro-ph/9610140/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Many large scale numerical simulations of astrophysical plasmas must also reproduce the hydrogen ionization and the resulting emission spectrum, in some cases quite accurately. We describe a compact model hydrogen atom that can be readily incorporated into such simulations. It reproduces the recombination efficiency and line spectrum predicted by much larger calculations for a very broad range of densities and temperatures. Uncertainties in hydrogen collision data are the largest source of differences between our compact atom and predictions of more extensive calculations, and underscore the n","authors_text":"Gary J. Ferland, Jason W. Ferguson","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1996-10-18T13:31:29Z","title":"Accurate Hydrogen Spectral Simulations with a Compact Model Atom"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9610140","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":"sha256:46bd8eb5bd2027166650543a86657562a72412f1734e6ca8fa1ca5020512cd69","target":"record","created_at":"2026-07-04T16:00:16Z","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":"03bd518b2c3ae13a08629d2c3f078152ba116e443c38c49084db4ae75ce20bdd","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1996-10-18T13:31:29Z","title_canon_sha256":"de459c98102fcc70f6b594111daa8ffff3c480503aeeb5dc771b57aa6119d4b1"},"schema_version":"1.0","source":{"id":"astro-ph/9610140","kind":"arxiv","version":1}},"canonical_sha256":"0b8140c9eb1a4176b93651ba12b618fd8505e22ad150a985e6badecd379a6326","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0b8140c9eb1a4176b93651ba12b618fd8505e22ad150a985e6badecd379a6326","first_computed_at":"2026-07-04T16:00:16.884843Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:00:16.884843Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gXIR8rb/Vo32/IvFiSYy99eNIEvYis+lpeDVH2wndNJgB7fVBh78jUpYpYKUpGTScHS56RJHrUxWPPeMcIm1AQ==","signature_status":"signed_v1","signed_at":"2026-07-04T16:00:16.885257Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9610140","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:46bd8eb5bd2027166650543a86657562a72412f1734e6ca8fa1ca5020512cd69","sha256:71b9e7fd17685ace24915bb8c538ac7c1bd0d9af0a115f8e24aa2d06f0ff6381"],"state_sha256":"16024c22600e13ba92fbccc874dc3b8996113d5f6e0b5287e07edc970671dd82"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wq6DrxE7mFDUP9vIwCpaZ3PMAmE5C3yd9OHeyW9w+et1EYx19wqarR+K+eW0eOGGZ1EQc4/VsoVjYDsspm0NBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T00:41:46.552956Z","bundle_sha256":"ebf0bab6a0e0cfba29314020bb775e667767e229b4873719d424e3fe53194e72"}}