{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:37L33HEGSZ4ZMHHPCABI3VY64F","short_pith_number":"pith:37L33HEG","schema_version":"1.0","canonical_sha256":"dfd7bd9c869679961cef10028dd71ee1620f0e4972fe8f49163e6640c2c7306f","source":{"kind":"arxiv","id":"1811.08389","version":1},"attestation_state":"computed","paper":{"title":"Software tool for automatic detection of solar plages in the Coimbra Observatory spectroheliograms","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Garcia, A.M. Lourenco, F. Pinheiro, I. Dorotovic, J. Fernandes, S. Carvalho, T. Barata","submitted_at":"2018-11-20T17:51:37Z","abstract_excerpt":"Full-disk spectroheliograms have been taken in Coimbra on a daily basis since 1926 in the Ca II K-line (K1 and K3). Later, in 1989, with the upgrade of the equipment it was possible to start the observations in the H-alpha line. The spectroheliograms of Coimbra constitutes a huge dataset of solar images, which requires an efficient automatic tool to detect and analyse solar activity features. This work presents a mathematical morphology approach applied to the CaII K3 series. The objective is to create a tool based on the segmentation by watershed transform combined with other morphological op"},"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":"1811.08389","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-11-20T17:51:37Z","cross_cats_sorted":[],"title_canon_sha256":"863184dff8cce29ee1af491fcfb783b0f92e0f22345d5cc5527fdd6abcfb29b0","abstract_canon_sha256":"0a89ccd603473eb4ebef5013fe03523f2df1354e79553a1b3cba13aeb35da795"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:00:14.208645Z","signature_b64":"/FuqwSAvCshQVwbwj/WJE9WolSKKEwOMUt7s3rNkCXCuoJ8ZJ1vk+d/DRcVfUH4F3v0C9W22vnxeRDbeKLjfAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"dfd7bd9c869679961cef10028dd71ee1620f0e4972fe8f49163e6640c2c7306f","last_reissued_at":"2026-05-18T00:00:14.208067Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:00:14.208067Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Software tool for automatic detection of solar plages in the Coimbra Observatory spectroheliograms","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Garcia, A.M. Lourenco, F. Pinheiro, I. Dorotovic, J. Fernandes, S. Carvalho, T. Barata","submitted_at":"2018-11-20T17:51:37Z","abstract_excerpt":"Full-disk spectroheliograms have been taken in Coimbra on a daily basis since 1926 in the Ca II K-line (K1 and K3). Later, in 1989, with the upgrade of the equipment it was possible to start the observations in the H-alpha line. The spectroheliograms of Coimbra constitutes a huge dataset of solar images, which requires an efficient automatic tool to detect and analyse solar activity features. This work presents a mathematical morphology approach applied to the CaII K3 series. The objective is to create a tool based on the segmentation by watershed transform combined with other morphological op"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.08389","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":"1811.08389","created_at":"2026-05-18T00:00:14.208156+00:00"},{"alias_kind":"arxiv_version","alias_value":"1811.08389v1","created_at":"2026-05-18T00:00:14.208156+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.08389","created_at":"2026-05-18T00:00:14.208156+00:00"},{"alias_kind":"pith_short_12","alias_value":"37L33HEGSZ4Z","created_at":"2026-05-18T12:32:02.567920+00:00"},{"alias_kind":"pith_short_16","alias_value":"37L33HEGSZ4ZMHHP","created_at":"2026-05-18T12:32:02.567920+00:00"},{"alias_kind":"pith_short_8","alias_value":"37L33HEG","created_at":"2026-05-18T12:32:02.567920+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/37L33HEGSZ4ZMHHPCABI3VY64F","json":"https://pith.science/pith/37L33HEGSZ4ZMHHPCABI3VY64F.json","graph_json":"https://pith.science/api/pith-number/37L33HEGSZ4ZMHHPCABI3VY64F/graph.json","events_json":"https://pith.science/api/pith-number/37L33HEGSZ4ZMHHPCABI3VY64F/events.json","paper":"https://pith.science/paper/37L33HEG"},"agent_actions":{"view_html":"https://pith.science/pith/37L33HEGSZ4ZMHHPCABI3VY64F","download_json":"https://pith.science/pith/37L33HEGSZ4ZMHHPCABI3VY64F.json","view_paper":"https://pith.science/paper/37L33HEG","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1811.08389&json=true","fetch_graph":"https://pith.science/api/pith-number/37L33HEGSZ4ZMHHPCABI3VY64F/graph.json","fetch_events":"https://pith.science/api/pith-number/37L33HEGSZ4ZMHHPCABI3VY64F/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/37L33HEGSZ4ZMHHPCABI3VY64F/action/timestamp_anchor","attest_storage":"https://pith.science/pith/37L33HEGSZ4ZMHHPCABI3VY64F/action/storage_attestation","attest_author":"https://pith.science/pith/37L33HEGSZ4ZMHHPCABI3VY64F/action/author_attestation","sign_citation":"https://pith.science/pith/37L33HEGSZ4ZMHHPCABI3VY64F/action/citation_signature","submit_replication":"https://pith.science/pith/37L33HEGSZ4ZMHHPCABI3VY64F/action/replication_record"}},"created_at":"2026-05-18T00:00:14.208156+00:00","updated_at":"2026-05-18T00:00:14.208156+00:00"}