{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:T4E4VNDROQ5XI5NK6G66FFHETU","short_pith_number":"pith:T4E4VNDR","canonical_record":{"source":{"id":"1205.2393","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-05-10T21:54:08Z","cross_cats_sorted":[],"title_canon_sha256":"14416a90c3ef6f70d0c7381aba4d9eee79064c5d5aa448f4518eeb2dcce37014","abstract_canon_sha256":"049b798117ac5a25297a1817652c9f78a2403704ad6b358968e9811f486bad59"},"schema_version":"1.0"},"canonical_sha256":"9f09cab471743b7475aaf1bde294e49d10f25efe65df59f3a641c0c1cc70f744","source":{"kind":"arxiv","id":"1205.2393","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1205.2393","created_at":"2026-05-18T03:55:55Z"},{"alias_kind":"arxiv_version","alias_value":"1205.2393v1","created_at":"2026-05-18T03:55:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1205.2393","created_at":"2026-05-18T03:55:55Z"},{"alias_kind":"pith_short_12","alias_value":"T4E4VNDROQ5X","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_16","alias_value":"T4E4VNDROQ5XI5NK","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_8","alias_value":"T4E4VNDR","created_at":"2026-05-18T12:27:23Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:T4E4VNDROQ5XI5NK6G66FFHETU","target":"record","payload":{"canonical_record":{"source":{"id":"1205.2393","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-05-10T21:54:08Z","cross_cats_sorted":[],"title_canon_sha256":"14416a90c3ef6f70d0c7381aba4d9eee79064c5d5aa448f4518eeb2dcce37014","abstract_canon_sha256":"049b798117ac5a25297a1817652c9f78a2403704ad6b358968e9811f486bad59"},"schema_version":"1.0"},"canonical_sha256":"9f09cab471743b7475aaf1bde294e49d10f25efe65df59f3a641c0c1cc70f744","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:55:55.649200Z","signature_b64":"XRBqHGCY7Z7VAGPQ1l0HsT1cdItAVr4f+brfiATT+YTy1/3s/wKcEWd8AL2tJxqh4Hxhet9YrUu/dq/vq4ndCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9f09cab471743b7475aaf1bde294e49d10f25efe65df59f3a641c0c1cc70f744","last_reissued_at":"2026-05-18T03:55:55.648506Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:55:55.648506Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1205.2393","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":"2026-05-18T03:55:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aSXxqv37VVQ0VZPeOvF6I+tBc1eqMHgyTsd5oM6LvMPXWOwBxxF3zsr0ffFlAWwDNx14hnNwDgTOlSBujUPTDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T08:54:01.247665Z"},"content_sha256":"60b14feafe64a321a89e13d5e4305b86aa4420b7de8087ca1af43c9e9e4834dd","schema_version":"1.0","event_id":"sha256:60b14feafe64a321a89e13d5e4305b86aa4420b7de8087ca1af43c9e9e4834dd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:T4E4VNDROQ5XI5NK6G66FFHETU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Determination of Electromagnetic Source Direction as an Eigenvalue Problem","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Charles Lindsey, Juan C. Mart\\'inez-Oliveros, S\\\"am Krucker, Stuart D. Bale","submitted_at":"2012-05-10T21:54:08Z","abstract_excerpt":"Low-frequency solar and interplanetary radio bursts are generated at frequencies below the ionospheric plasma cutoff and must therefore be measured in space, with deployable antenna systems. The problem of measuring both the general direction and polarization of an electromagnetic source is commonly solved by iterative fitting methods such as linear regression that deal simultaneously with both directional and polarization parameters. We have developed a scheme that separates the problem of deriving the source direction from that of determining the polarization, avoiding iteration in a multi-d"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1205.2393","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":"2026-05-18T03:55:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IrqviKVv4GPKKvOwQ8oPpMazfR3fyvd5kKVGXiEYz5OyEMoIN0xwX0yHkN5c+io3ATOZTxZcC/mMmCSRx7iWAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T08:54:01.248340Z"},"content_sha256":"13e326e861135423c24e7f69395ac10afd29075df88f08b2f5dbaed10bb9d9c9","schema_version":"1.0","event_id":"sha256:13e326e861135423c24e7f69395ac10afd29075df88f08b2f5dbaed10bb9d9c9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/T4E4VNDROQ5XI5NK6G66FFHETU/bundle.json","state_url":"https://pith.science/pith/T4E4VNDROQ5XI5NK6G66FFHETU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/T4E4VNDROQ5XI5NK6G66FFHETU/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":"2026-06-07T08:54:01Z","links":{"resolver":"https://pith.science/pith/T4E4VNDROQ5XI5NK6G66FFHETU","bundle":"https://pith.science/pith/T4E4VNDROQ5XI5NK6G66FFHETU/bundle.json","state":"https://pith.science/pith/T4E4VNDROQ5XI5NK6G66FFHETU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/T4E4VNDROQ5XI5NK6G66FFHETU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:T4E4VNDROQ5XI5NK6G66FFHETU","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":"049b798117ac5a25297a1817652c9f78a2403704ad6b358968e9811f486bad59","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-05-10T21:54:08Z","title_canon_sha256":"14416a90c3ef6f70d0c7381aba4d9eee79064c5d5aa448f4518eeb2dcce37014"},"schema_version":"1.0","source":{"id":"1205.2393","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1205.2393","created_at":"2026-05-18T03:55:55Z"},{"alias_kind":"arxiv_version","alias_value":"1205.2393v1","created_at":"2026-05-18T03:55:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1205.2393","created_at":"2026-05-18T03:55:55Z"},{"alias_kind":"pith_short_12","alias_value":"T4E4VNDROQ5X","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_16","alias_value":"T4E4VNDROQ5XI5NK","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_8","alias_value":"T4E4VNDR","created_at":"2026-05-18T12:27:23Z"}],"graph_snapshots":[{"event_id":"sha256:13e326e861135423c24e7f69395ac10afd29075df88f08b2f5dbaed10bb9d9c9","target":"graph","created_at":"2026-05-18T03:55:55Z","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":"Low-frequency solar and interplanetary radio bursts are generated at frequencies below the ionospheric plasma cutoff and must therefore be measured in space, with deployable antenna systems. The problem of measuring both the general direction and polarization of an electromagnetic source is commonly solved by iterative fitting methods such as linear regression that deal simultaneously with both directional and polarization parameters. We have developed a scheme that separates the problem of deriving the source direction from that of determining the polarization, avoiding iteration in a multi-d","authors_text":"Charles Lindsey, Juan C. Mart\\'inez-Oliveros, S\\\"am Krucker, Stuart D. Bale","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-05-10T21:54:08Z","title":"Determination of Electromagnetic Source Direction as an Eigenvalue Problem"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1205.2393","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":"sha256:60b14feafe64a321a89e13d5e4305b86aa4420b7de8087ca1af43c9e9e4834dd","target":"record","created_at":"2026-05-18T03:55:55Z","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":"049b798117ac5a25297a1817652c9f78a2403704ad6b358968e9811f486bad59","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-05-10T21:54:08Z","title_canon_sha256":"14416a90c3ef6f70d0c7381aba4d9eee79064c5d5aa448f4518eeb2dcce37014"},"schema_version":"1.0","source":{"id":"1205.2393","kind":"arxiv","version":1}},"canonical_sha256":"9f09cab471743b7475aaf1bde294e49d10f25efe65df59f3a641c0c1cc70f744","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9f09cab471743b7475aaf1bde294e49d10f25efe65df59f3a641c0c1cc70f744","first_computed_at":"2026-05-18T03:55:55.648506Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:55:55.648506Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"XRBqHGCY7Z7VAGPQ1l0HsT1cdItAVr4f+brfiATT+YTy1/3s/wKcEWd8AL2tJxqh4Hxhet9YrUu/dq/vq4ndCA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:55:55.649200Z","signed_message":"canonical_sha256_bytes"},"source_id":"1205.2393","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:60b14feafe64a321a89e13d5e4305b86aa4420b7de8087ca1af43c9e9e4834dd","sha256:13e326e861135423c24e7f69395ac10afd29075df88f08b2f5dbaed10bb9d9c9"],"state_sha256":"f28051ff3851ac4c96106214e059b02317439475870cff23eb3c8c7015bc27c7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PUm0BOZ60ql3v1qFgu9kLUygqIcNIOvtL/3L2CAi1czCIS0y7WpJdlVkX/w4T6l5IVuTN1M6E/DOsw5XKr1LCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T08:54:01.251660Z","bundle_sha256":"e98d2d15be9331f2de8f23b8425bfc86f6d4ae1a6aa2145aeb374993ef09bfbf"}}