{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:B6IED4VU2GYZE4ZOSABJOXH56U","short_pith_number":"pith:B6IED4VU","canonical_record":{"source":{"id":"1107.2441","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-13T00:37:14Z","cross_cats_sorted":[],"title_canon_sha256":"9b2496013937591b7fe3916c6b10c323dad49ff14c5d0cd466df016a4b227869","abstract_canon_sha256":"663fea3a5ee63714b7650b1f4618911788f479c2ea778d189fb327502064a4f3"},"schema_version":"1.0"},"canonical_sha256":"0f9041f2b4d1b192732e9002975cfdf5236e0ce232a8b7379f0635c990c4c8a9","source":{"kind":"arxiv","id":"1107.2441","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1107.2441","created_at":"2026-05-18T02:01:19Z"},{"alias_kind":"arxiv_version","alias_value":"1107.2441v1","created_at":"2026-05-18T02:01:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1107.2441","created_at":"2026-05-18T02:01:19Z"},{"alias_kind":"pith_short_12","alias_value":"B6IED4VU2GYZ","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_16","alias_value":"B6IED4VU2GYZE4ZO","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_8","alias_value":"B6IED4VU","created_at":"2026-05-18T12:26:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:B6IED4VU2GYZE4ZOSABJOXH56U","target":"record","payload":{"canonical_record":{"source":{"id":"1107.2441","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-13T00:37:14Z","cross_cats_sorted":[],"title_canon_sha256":"9b2496013937591b7fe3916c6b10c323dad49ff14c5d0cd466df016a4b227869","abstract_canon_sha256":"663fea3a5ee63714b7650b1f4618911788f479c2ea778d189fb327502064a4f3"},"schema_version":"1.0"},"canonical_sha256":"0f9041f2b4d1b192732e9002975cfdf5236e0ce232a8b7379f0635c990c4c8a9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:01:19.314428Z","signature_b64":"kKCxuXZK3TWTh6Ojii9Ppu7vaMG11yrl2FhAr4XX4S9eB37EArcZ78My3+bInFr/IFuyXdCtfh2b0dLEyJOECA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0f9041f2b4d1b192732e9002975cfdf5236e0ce232a8b7379f0635c990c4c8a9","last_reissued_at":"2026-05-18T02:01:19.313680Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:01:19.313680Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1107.2441","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":"2026-05-18T02:01:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UlBNlOwsPYcIthi6qbhDzRDVGL+E0x/HJSvjCFGohs4nOnGW9r/09YYSerpZDJkIyXXMcdon66UY4q6vPgmKDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T01:18:04.099731Z"},"content_sha256":"c7c725d7f1a78db1cce01d020fc52bb1fccebac8066908009687bb031c7097d8","schema_version":"1.0","event_id":"sha256:c7c725d7f1a78db1cce01d020fc52bb1fccebac8066908009687bb031c7097d8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:B6IED4VU2GYZE4ZOSABJOXH56U","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Model for the Origin of High Density in Loop-top X-ray Sources","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"D.W. Longcope, S.E. Guidoni","submitted_at":"2011-07-13T00:37:14Z","abstract_excerpt":"Super-hot looptop sources, detected in some large solar flares, are compact sources of HXR emission with spectra matching thermal electron populations exceeding 30 megakelvins. High observed emission measure, as well as inference of electron thermalization within the small source region, both provide evidence of high densities at the looptop; typically more than an order of magnitude above ambient. Where some investigators have suggested such density enhancement results from a rapid enhancement in the magnetic field strength, we propose an alternative model, based on Petschek reconnection, whe"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1107.2441","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":"2026-05-18T02:01:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uk/GLhYKOItSCaGEr/SYQv+EUD9y2Ylymb7o8iAaAlBKRKjT7j55v8s9tbmA/V+KD0JwDxv8QZYOWniVQCZfAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T01:18:04.100104Z"},"content_sha256":"50d2cdc001b08c9c6ec3788b09ea6c4b3895828f40e4b6853171d408f8f688a4","schema_version":"1.0","event_id":"sha256:50d2cdc001b08c9c6ec3788b09ea6c4b3895828f40e4b6853171d408f8f688a4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/B6IED4VU2GYZE4ZOSABJOXH56U/bundle.json","state_url":"https://pith.science/pith/B6IED4VU2GYZE4ZOSABJOXH56U/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/B6IED4VU2GYZE4ZOSABJOXH56U/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":"2026-06-06T01:18:04Z","links":{"resolver":"https://pith.science/pith/B6IED4VU2GYZE4ZOSABJOXH56U","bundle":"https://pith.science/pith/B6IED4VU2GYZE4ZOSABJOXH56U/bundle.json","state":"https://pith.science/pith/B6IED4VU2GYZE4ZOSABJOXH56U/state.json","well_known_bundle":"https://pith.science/.well-known/pith/B6IED4VU2GYZE4ZOSABJOXH56U/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:B6IED4VU2GYZE4ZOSABJOXH56U","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":"663fea3a5ee63714b7650b1f4618911788f479c2ea778d189fb327502064a4f3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-13T00:37:14Z","title_canon_sha256":"9b2496013937591b7fe3916c6b10c323dad49ff14c5d0cd466df016a4b227869"},"schema_version":"1.0","source":{"id":"1107.2441","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1107.2441","created_at":"2026-05-18T02:01:19Z"},{"alias_kind":"arxiv_version","alias_value":"1107.2441v1","created_at":"2026-05-18T02:01:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1107.2441","created_at":"2026-05-18T02:01:19Z"},{"alias_kind":"pith_short_12","alias_value":"B6IED4VU2GYZ","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_16","alias_value":"B6IED4VU2GYZE4ZO","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_8","alias_value":"B6IED4VU","created_at":"2026-05-18T12:26:24Z"}],"graph_snapshots":[{"event_id":"sha256:50d2cdc001b08c9c6ec3788b09ea6c4b3895828f40e4b6853171d408f8f688a4","target":"graph","created_at":"2026-05-18T02:01:19Z","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":"Super-hot looptop sources, detected in some large solar flares, are compact sources of HXR emission with spectra matching thermal electron populations exceeding 30 megakelvins. High observed emission measure, as well as inference of electron thermalization within the small source region, both provide evidence of high densities at the looptop; typically more than an order of magnitude above ambient. Where some investigators have suggested such density enhancement results from a rapid enhancement in the magnetic field strength, we propose an alternative model, based on Petschek reconnection, whe","authors_text":"D.W. Longcope, S.E. Guidoni","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-13T00:37:14Z","title":"A Model for the Origin of High Density in Loop-top X-ray Sources"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1107.2441","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:c7c725d7f1a78db1cce01d020fc52bb1fccebac8066908009687bb031c7097d8","target":"record","created_at":"2026-05-18T02:01:19Z","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":"663fea3a5ee63714b7650b1f4618911788f479c2ea778d189fb327502064a4f3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-13T00:37:14Z","title_canon_sha256":"9b2496013937591b7fe3916c6b10c323dad49ff14c5d0cd466df016a4b227869"},"schema_version":"1.0","source":{"id":"1107.2441","kind":"arxiv","version":1}},"canonical_sha256":"0f9041f2b4d1b192732e9002975cfdf5236e0ce232a8b7379f0635c990c4c8a9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0f9041f2b4d1b192732e9002975cfdf5236e0ce232a8b7379f0635c990c4c8a9","first_computed_at":"2026-05-18T02:01:19.313680Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:01:19.313680Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kKCxuXZK3TWTh6Ojii9Ppu7vaMG11yrl2FhAr4XX4S9eB37EArcZ78My3+bInFr/IFuyXdCtfh2b0dLEyJOECA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:01:19.314428Z","signed_message":"canonical_sha256_bytes"},"source_id":"1107.2441","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c7c725d7f1a78db1cce01d020fc52bb1fccebac8066908009687bb031c7097d8","sha256:50d2cdc001b08c9c6ec3788b09ea6c4b3895828f40e4b6853171d408f8f688a4"],"state_sha256":"753faa2757c90cb6307a1984258257007dfc113fd43063b7f17890c513faa3c5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"C0NY/Bf2cE6/tdJMJOT/LVj7vYBqVr4Al82z7i+KF4f5GHi0/2gJf5iIqOJvd1wgDPSpC7Lu1gzaMvTlO9paDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-06T01:18:04.102450Z","bundle_sha256":"9302aeb1c1b25c615ea60e2f0f4ce8980c8acc6d261558c85132546711146fa2"}}