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Magnetic Field Measurements From Rome During t","work_id":"2d027ab3-ba4a-458f-812f-8bb090695fdd","year":2020}],"snapshot_sha256":"6c776ae60389f05188f9fd5631c6c3b778b3874d199a2a9b882d49536574d274"},"source":{"id":"2507.07009","kind":"arxiv","version":5},"verdict":{"created_at":"2026-05-19T06:33:29.967755Z","id":"891301ba-daab-4ac6-b1e0-df1384c077d7","model_set":{"reader":"grok-4.3"},"one_line_summary":"Measurements from the May 2024 storm show strong correlation between observed and TVA-computed GICs, moderate model performance for magnetic perturbations, and empirical links between GIC magnitude and factors of separation distance, ground conductivity scaling, and geomagnetic latitude.","pipeline_version":"pith-pipeline@v0.9.0","pith_extraction_headline":"Data from the May 2024 geomagnetic storm enable empirical relationships for predicting GIC magnitudes and site correlations across the US power grid.","strongest_claim":"GIC measured and computed by TVA had a correlation coefficient r>0.8 and a prediction efficiency between 0.4 and 0.7; horizontal magnetic field perturbations from three global models had correlations from 0.21 to 0.65; two empirical relationships link GIC site-pair correlations to separation distance, beta scaling, and latitude, and a regression estimates maximum GIC from the product of alpha and beta.","weakest_assumption":"The beta scaling factor is assumed to correctly capture site-to-site differences in ground conductivity, and the 47 GIC sites plus 17 magnetometer sites are taken as sufficiently representative of the contiguous United States for deriving general empirical relationships (abstract, final paragraph)."}},"verdict_id":"891301ba-daab-4ac6-b1e0-df1384c077d7"}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:1487bee77b6c72e449df3163015afe804e38aab12c3826c170bf62f770508e82","target":"record","created_at":"2026-05-26T01:02:27Z","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":"d699ca03f3c0c5dc0e3d5ac0930d405a970f62208cda801bc45accbaf532e7d1","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.space-ph","submitted_at":"2025-07-09T16:37:02Z","title_canon_sha256":"da2ba2d89ed8de9ed083fd2ac5861a35e05e5600d0c5e4b1990162f5898c12ac"},"schema_version":"1.0","source":{"id":"2507.07009","kind":"arxiv","version":5}},"canonical_sha256":"6e8b12d956bbf4f4beca1dae7e6471e4c6ad91e27c4b3a5a17ce1a494b96085b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6e8b12d956bbf4f4beca1dae7e6471e4c6ad91e27c4b3a5a17ce1a494b96085b","first_computed_at":"2026-05-26T01:02:27.224305Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-26T01:02:27.224305Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QQWkMUwExpOeW3gBJV1rmoIV8GNGqMqEREaGnm0edNtu31yz0G7klV/BjFii5is+EZsQctARf/RS8tEwxT3oDA==","signature_status":"signed_v1","signed_at":"2026-05-26T01:02:27.225043Z","signed_message":"canonical_sha256_bytes"},"source_id":"2507.07009","source_kind":"arxiv","source_version":5}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1487bee77b6c72e449df3163015afe804e38aab12c3826c170bf62f770508e82","sha256:db02ee0f34788afcd738273436671da90116525594eb3636d16cb7eff1e0de25"],"state_sha256":"38cde07a23a4246a1cd80650f4d490ef84294c227886d7aa6466f6a33f3bae0c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fJsuBEzjnGd6oqpQLpe7s9lPQ/xohU4X2m/FZOHEnS6PnvrgiFEkhzNp7fQeL/PRx4ku4qjp6xiX5LclvxHHBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T13:00:05.431148Z","bundle_sha256":"3fdc65b32a800534f7f77d32d2f379b513a8107ccb9871d0368fb7b4e7b51389"}}