{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:TYYXEHCP2OL6EE53QWZEO5E3OJ","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":"9ef89eff4c22961835fa346e16fa7b7da7ca74b30400e866622c4a62e457797e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-09-24T09:53:52Z","title_canon_sha256":"c24e00092163c1d38516be78a5ec4b6ce3837896b3ac16d3697e5baddf5a5c34"},"schema_version":"1.0","source":{"id":"1209.5211","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.5211","created_at":"2026-05-18T01:54:19Z"},{"alias_kind":"arxiv_version","alias_value":"1209.5211v2","created_at":"2026-05-18T01:54:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.5211","created_at":"2026-05-18T01:54:19Z"},{"alias_kind":"pith_short_12","alias_value":"TYYXEHCP2OL6","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_16","alias_value":"TYYXEHCP2OL6EE53","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_8","alias_value":"TYYXEHCP","created_at":"2026-05-18T12:27:23Z"}],"graph_snapshots":[{"event_id":"sha256:ed753ccee63f974dd4d147167be74f92394e96f4a144f8eb348597ddac67467b","target":"graph","created_at":"2026-05-18T01:54:19Z","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":"We present a new improved version of our force-free electrodynamics (FFE) numerical code in spherical coordinates that extrapolates the magnetic field in the inner solar corona from a photospheric vector magnetogram. The code satisfies the photospheric boundary condition and the condition divB=0 to machine accuracy. The performance of our method is evaluated with standard convergence parameters, and is found to be comparable to that of other nonlinear force-free extrapolations.","authors_text":"Ioannis Contopoulos","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-09-24T09:53:52Z","title":"The Force-Free Electrodynamics Method for the Extrapolation of Coronal Magnetic Fields from Vector Magnetograms"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.5211","kind":"arxiv","version":2},"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:dc8c837c50480e3ef23a8e481929d5f16cdf90262a334b74944e82d41a9beb05","target":"record","created_at":"2026-05-18T01:54:19Z","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":"9ef89eff4c22961835fa346e16fa7b7da7ca74b30400e866622c4a62e457797e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-09-24T09:53:52Z","title_canon_sha256":"c24e00092163c1d38516be78a5ec4b6ce3837896b3ac16d3697e5baddf5a5c34"},"schema_version":"1.0","source":{"id":"1209.5211","kind":"arxiv","version":2}},"canonical_sha256":"9e31721c4fd397e213bb85b247749b72502cb7f254f889091d05d5a90a5c27bc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9e31721c4fd397e213bb85b247749b72502cb7f254f889091d05d5a90a5c27bc","first_computed_at":"2026-05-18T01:54:19.624500Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:54:19.624500Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"K1OVCq9JlS36JXRfFPGRknWmiJBrjbnVYg4OMfyIelqzh4B2VOHVN0miXa+ayVl0qy3E1I7dDaIDtvYEevnqDw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:54:19.625154Z","signed_message":"canonical_sha256_bytes"},"source_id":"1209.5211","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dc8c837c50480e3ef23a8e481929d5f16cdf90262a334b74944e82d41a9beb05","sha256:ed753ccee63f974dd4d147167be74f92394e96f4a144f8eb348597ddac67467b"],"state_sha256":"7dc85056df2d974e8cac3d7d9a674ee94c8acc002d88822500558476746e378e"}