{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:3OZIEGRVWDMFTS2DJHK5KNE6XR","short_pith_number":"pith:3OZIEGRV","canonical_record":{"source":{"id":"1808.05084","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.space-ph","submitted_at":"2018-08-15T13:52:14Z","cross_cats_sorted":[],"title_canon_sha256":"e74ab4f6a15886229cad198cedad7d22a032690872be38809598bf8324328e5a","abstract_canon_sha256":"f6fb60711eb68db5887e9e9d08395340ec9470ca81c83409ced936d5b98fcf1e"},"schema_version":"1.0"},"canonical_sha256":"dbb2821a35b0d859cb4349d5d5349ebc6a82d79d3a2d674626656486b2199227","source":{"kind":"arxiv","id":"1808.05084","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.05084","created_at":"2026-05-18T00:08:01Z"},{"alias_kind":"arxiv_version","alias_value":"1808.05084v1","created_at":"2026-05-18T00:08:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.05084","created_at":"2026-05-18T00:08:01Z"},{"alias_kind":"pith_short_12","alias_value":"3OZIEGRVWDMF","created_at":"2026-05-18T12:32:02Z"},{"alias_kind":"pith_short_16","alias_value":"3OZIEGRVWDMFTS2D","created_at":"2026-05-18T12:32:02Z"},{"alias_kind":"pith_short_8","alias_value":"3OZIEGRV","created_at":"2026-05-18T12:32:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:3OZIEGRVWDMFTS2DJHK5KNE6XR","target":"record","payload":{"canonical_record":{"source":{"id":"1808.05084","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.space-ph","submitted_at":"2018-08-15T13:52:14Z","cross_cats_sorted":[],"title_canon_sha256":"e74ab4f6a15886229cad198cedad7d22a032690872be38809598bf8324328e5a","abstract_canon_sha256":"f6fb60711eb68db5887e9e9d08395340ec9470ca81c83409ced936d5b98fcf1e"},"schema_version":"1.0"},"canonical_sha256":"dbb2821a35b0d859cb4349d5d5349ebc6a82d79d3a2d674626656486b2199227","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:08:01.653667Z","signature_b64":"gRu3BjrqaO2uEtWncUXQsnHallgaHWpoS/6wmJYck0FpoLARoEn74EgYmo6kNGL0OEwd0KYKVF0nXiZBgBibAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"dbb2821a35b0d859cb4349d5d5349ebc6a82d79d3a2d674626656486b2199227","last_reissued_at":"2026-05-18T00:08:01.653061Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:08:01.653061Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1808.05084","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":"2026-05-18T00:08:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rzG8Rwwf8LSk5mFK64aR1QKzd04XOvgDRn5K7Nd9+G3XKXXugIp5Z369e/GD+jIn5YTJSrsCeG7C64p0LqBnBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T04:13:35.010705Z"},"content_sha256":"c5b012215e80864b6022ceac528caced442db5fe588d36496bfc84f355ba38ed","schema_version":"1.0","event_id":"sha256:c5b012215e80864b6022ceac528caced442db5fe588d36496bfc84f355ba38ed"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:3OZIEGRVWDMFTS2DJHK5KNE6XR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"MARSIS observations of field-aligned irregularities and ducted radio propagation in the Martian ionosphere","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.space-ph","authors_text":"Andrew J. Kopf, David D. Morgan, David J. Andrews, Donald A. Gurnett, Hermann J. Opgenoorth, Katy Fallows, Niklas J. T. Edberg, Paul Withers, Stephan Buchert, Thomas B. Leyser","submitted_at":"2018-08-15T13:52:14Z","abstract_excerpt":"Knowledge of Mars's ionosphere has been significantly advanced in recent years by observations from Mars Express (MEX) and lately MAVEN. A topic of particular interest are the interactions between the planet's ionospheric plasma and its highly structured crustal magnetic fields, and how these lead to the redistribution of plasma and affect the propagation of radio waves in the system. In this paper, we elucidate a possible relationship between two anomalous radar signatures previously reported in observations from the MARSIS instrument on MEX. Relatively uncommon observations of localized, ext"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.05084","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":"2026-05-18T00:08:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"f5ImTKliLObYjl4b1/CT8Nz6Yeq/TAGVSjeUyaPP5trDVcF+4LYJMJZgnYYQRCGhbSM7QKt7e9bsTWx7XQuqBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T04:13:35.011061Z"},"content_sha256":"32af5bbf989105742c831eb4589cda373591cbf925df506882ed5c5c3668789e","schema_version":"1.0","event_id":"sha256:32af5bbf989105742c831eb4589cda373591cbf925df506882ed5c5c3668789e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3OZIEGRVWDMFTS2DJHK5KNE6XR/bundle.json","state_url":"https://pith.science/pith/3OZIEGRVWDMFTS2DJHK5KNE6XR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3OZIEGRVWDMFTS2DJHK5KNE6XR/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":"2026-06-24T04:13:35Z","links":{"resolver":"https://pith.science/pith/3OZIEGRVWDMFTS2DJHK5KNE6XR","bundle":"https://pith.science/pith/3OZIEGRVWDMFTS2DJHK5KNE6XR/bundle.json","state":"https://pith.science/pith/3OZIEGRVWDMFTS2DJHK5KNE6XR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3OZIEGRVWDMFTS2DJHK5KNE6XR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:3OZIEGRVWDMFTS2DJHK5KNE6XR","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":"f6fb60711eb68db5887e9e9d08395340ec9470ca81c83409ced936d5b98fcf1e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.space-ph","submitted_at":"2018-08-15T13:52:14Z","title_canon_sha256":"e74ab4f6a15886229cad198cedad7d22a032690872be38809598bf8324328e5a"},"schema_version":"1.0","source":{"id":"1808.05084","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.05084","created_at":"2026-05-18T00:08:01Z"},{"alias_kind":"arxiv_version","alias_value":"1808.05084v1","created_at":"2026-05-18T00:08:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.05084","created_at":"2026-05-18T00:08:01Z"},{"alias_kind":"pith_short_12","alias_value":"3OZIEGRVWDMF","created_at":"2026-05-18T12:32:02Z"},{"alias_kind":"pith_short_16","alias_value":"3OZIEGRVWDMFTS2D","created_at":"2026-05-18T12:32:02Z"},{"alias_kind":"pith_short_8","alias_value":"3OZIEGRV","created_at":"2026-05-18T12:32:02Z"}],"graph_snapshots":[{"event_id":"sha256:32af5bbf989105742c831eb4589cda373591cbf925df506882ed5c5c3668789e","target":"graph","created_at":"2026-05-18T00:08:01Z","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"},"paper":{"abstract_excerpt":"Knowledge of Mars's ionosphere has been significantly advanced in recent years by observations from Mars Express (MEX) and lately MAVEN. A topic of particular interest are the interactions between the planet's ionospheric plasma and its highly structured crustal magnetic fields, and how these lead to the redistribution of plasma and affect the propagation of radio waves in the system. In this paper, we elucidate a possible relationship between two anomalous radar signatures previously reported in observations from the MARSIS instrument on MEX. Relatively uncommon observations of localized, ext","authors_text":"Andrew J. Kopf, David D. Morgan, David J. Andrews, Donald A. Gurnett, Hermann J. Opgenoorth, Katy Fallows, Niklas J. T. Edberg, Paul Withers, Stephan Buchert, Thomas B. Leyser","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.space-ph","submitted_at":"2018-08-15T13:52:14Z","title":"MARSIS observations of field-aligned irregularities and ducted radio propagation in the Martian ionosphere"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.05084","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:c5b012215e80864b6022ceac528caced442db5fe588d36496bfc84f355ba38ed","target":"record","created_at":"2026-05-18T00:08:01Z","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":"f6fb60711eb68db5887e9e9d08395340ec9470ca81c83409ced936d5b98fcf1e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.space-ph","submitted_at":"2018-08-15T13:52:14Z","title_canon_sha256":"e74ab4f6a15886229cad198cedad7d22a032690872be38809598bf8324328e5a"},"schema_version":"1.0","source":{"id":"1808.05084","kind":"arxiv","version":1}},"canonical_sha256":"dbb2821a35b0d859cb4349d5d5349ebc6a82d79d3a2d674626656486b2199227","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"dbb2821a35b0d859cb4349d5d5349ebc6a82d79d3a2d674626656486b2199227","first_computed_at":"2026-05-18T00:08:01.653061Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:08:01.653061Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gRu3BjrqaO2uEtWncUXQsnHallgaHWpoS/6wmJYck0FpoLARoEn74EgYmo6kNGL0OEwd0KYKVF0nXiZBgBibAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:08:01.653667Z","signed_message":"canonical_sha256_bytes"},"source_id":"1808.05084","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c5b012215e80864b6022ceac528caced442db5fe588d36496bfc84f355ba38ed","sha256:32af5bbf989105742c831eb4589cda373591cbf925df506882ed5c5c3668789e"],"state_sha256":"a9fc057724cf5dc88f040f7bec7ee9934d32ba46b35e5ede219cc83336c97e2a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OYhMLl5r/D2Tb0nc9NDp3V5mN2WInXFs3uArX0jh+wwefZmaQ8wp8xalSYTHr2oO9WN6f+VNx6OO69wBt4Z3BQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-24T04:13:35.013008Z","bundle_sha256":"47a74ed66e98f151897765ab56ca146ec9d422fc282d42396e0d5032a9e5bc65"}}