{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:4N5SASCI3QGCNHCHEMUPZ4CFNV","short_pith_number":"pith:4N5SASCI","schema_version":"1.0","canonical_sha256":"e37b204848dc0c269c472328fcf0456d78a26ed4911e7ba87e50ae912987a27c","source":{"kind":"arxiv","id":"1901.05207","version":1},"attestation_state":"computed","paper":{"title":"Recent insights on the penumbra formation process","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"F. Zuccarello, M. Murabito, P.Romano, S.L.Guglielmino","submitted_at":"2019-01-16T10:16:49Z","abstract_excerpt":"Using high-resolution spectropolarimetric data acquired by \\textit{IBIS}, as well as \\textit{SDO}/HMI observations, we studied the penumbra formation in AR NOAA 11490 and in a sample of twelve ARs appeared on the solar disk on 2011 and 2012, which were characterized by $\\beta$-type magnetic field configuration. The results show that the onset of the classical Evershed flow occurs in a very short time scale, 1-3 hours. Studying the formation of the first penumbral sector around the following proto-spot, we found that a stable penumbra forms in the area facing the opposite polarity, which appear"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1901.05207","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-01-16T10:16:49Z","cross_cats_sorted":[],"title_canon_sha256":"f2438be232e4631194e23e8d632c2a5cd64b645e2db65fd629b571d3f77ea7e8","abstract_canon_sha256":"c730a986e0dae5254b672132b6458b3387e8a3bb226e752027561cefab22298b"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:40:33.659731Z","signature_b64":"Z9yyny8vJO10ujNkc6NSpHSCISCD9TgxQkQrrqsH8UzBQUL6Z+LfP+qHwPjnVtEhysVM3PakeNAf6c7wUOoBBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e37b204848dc0c269c472328fcf0456d78a26ed4911e7ba87e50ae912987a27c","last_reissued_at":"2026-05-17T23:40:33.659230Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:40:33.659230Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Recent insights on the penumbra formation process","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"F. Zuccarello, M. Murabito, P.Romano, S.L.Guglielmino","submitted_at":"2019-01-16T10:16:49Z","abstract_excerpt":"Using high-resolution spectropolarimetric data acquired by \\textit{IBIS}, as well as \\textit{SDO}/HMI observations, we studied the penumbra formation in AR NOAA 11490 and in a sample of twelve ARs appeared on the solar disk on 2011 and 2012, which were characterized by $\\beta$-type magnetic field configuration. The results show that the onset of the classical Evershed flow occurs in a very short time scale, 1-3 hours. Studying the formation of the first penumbral sector around the following proto-spot, we found that a stable penumbra forms in the area facing the opposite polarity, which appear"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.05207","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1901.05207","created_at":"2026-05-17T23:40:33.659310+00:00"},{"alias_kind":"arxiv_version","alias_value":"1901.05207v1","created_at":"2026-05-17T23:40:33.659310+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.05207","created_at":"2026-05-17T23:40:33.659310+00:00"},{"alias_kind":"pith_short_12","alias_value":"4N5SASCI3QGC","created_at":"2026-05-18T12:33:10.108867+00:00"},{"alias_kind":"pith_short_16","alias_value":"4N5SASCI3QGCNHCH","created_at":"2026-05-18T12:33:10.108867+00:00"},{"alias_kind":"pith_short_8","alias_value":"4N5SASCI","created_at":"2026-05-18T12:33:10.108867+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/4N5SASCI3QGCNHCHEMUPZ4CFNV","json":"https://pith.science/pith/4N5SASCI3QGCNHCHEMUPZ4CFNV.json","graph_json":"https://pith.science/api/pith-number/4N5SASCI3QGCNHCHEMUPZ4CFNV/graph.json","events_json":"https://pith.science/api/pith-number/4N5SASCI3QGCNHCHEMUPZ4CFNV/events.json","paper":"https://pith.science/paper/4N5SASCI"},"agent_actions":{"view_html":"https://pith.science/pith/4N5SASCI3QGCNHCHEMUPZ4CFNV","download_json":"https://pith.science/pith/4N5SASCI3QGCNHCHEMUPZ4CFNV.json","view_paper":"https://pith.science/paper/4N5SASCI","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1901.05207&json=true","fetch_graph":"https://pith.science/api/pith-number/4N5SASCI3QGCNHCHEMUPZ4CFNV/graph.json","fetch_events":"https://pith.science/api/pith-number/4N5SASCI3QGCNHCHEMUPZ4CFNV/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/4N5SASCI3QGCNHCHEMUPZ4CFNV/action/timestamp_anchor","attest_storage":"https://pith.science/pith/4N5SASCI3QGCNHCHEMUPZ4CFNV/action/storage_attestation","attest_author":"https://pith.science/pith/4N5SASCI3QGCNHCHEMUPZ4CFNV/action/author_attestation","sign_citation":"https://pith.science/pith/4N5SASCI3QGCNHCHEMUPZ4CFNV/action/citation_signature","submit_replication":"https://pith.science/pith/4N5SASCI3QGCNHCHEMUPZ4CFNV/action/replication_record"}},"created_at":"2026-05-17T23:40:33.659310+00:00","updated_at":"2026-05-17T23:40:33.659310+00:00"}