{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2021:5DXJWGASHAE36FHKM57ARRPBQS","short_pith_number":"pith:5DXJWGAS","schema_version":"1.0","canonical_sha256":"e8ee9b18123809bf14ea677e08c5e18489319f2ed5aec3e596c61502bf617cfd","source":{"kind":"arxiv","id":"2104.03170","version":2},"attestation_state":"computed","paper":{"title":"An Ultra-long Wavelength Sky Model with Absorption Effect","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Bin Yue, Qizhi Huang, Shifan Zuo, Xuelei Chen, Yanping Cong, Yidong Xu","submitted_at":"2021-04-07T14:59:56Z","abstract_excerpt":"The radio sky at frequencies below $\\sim10$ MHz is still largely unknown, this remains the last unexplored part of the electromagnetic spectrum in astronomy. The upcoming space experiments aiming at such low frequencies (ultra-long wavelength or ultra-low frequency) would benefit from reasonable expectations of the sky brightness distribution at relevant frequencies. In this work, we develop a radio sky model that is valid down to $\\sim1$ MHz. In addition to the discrete HII objects, we take into account the free-free absorption by thermal electrons in the Milky Way's warm ionized medium (WIM)"},"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":"2104.03170","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-04-07T14:59:56Z","cross_cats_sorted":[],"title_canon_sha256":"5d65e290780fce52dbf81f1887fe998bf46e3fcbbe257a73ec4e646193ba31c3","abstract_canon_sha256":"dc33f12de05ad3b132086e489a6c748e59d5460437483e9bc19072fa65c6c8c6"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:53:40.433518Z","signature_b64":"aFta3m4uByYJBv114bRUTyTRkcj6izu2nP64Wxnek2xfH6vHiW3u9LehrfkeaT3LnuPLZvrnNW+HZnX0LvYkAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e8ee9b18123809bf14ea677e08c5e18489319f2ed5aec3e596c61502bf617cfd","last_reissued_at":"2026-07-05T02:53:40.433050Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:53:40.433050Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"An Ultra-long Wavelength Sky Model with Absorption Effect","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Bin Yue, Qizhi Huang, Shifan Zuo, Xuelei Chen, Yanping Cong, Yidong Xu","submitted_at":"2021-04-07T14:59:56Z","abstract_excerpt":"The radio sky at frequencies below $\\sim10$ MHz is still largely unknown, this remains the last unexplored part of the electromagnetic spectrum in astronomy. The upcoming space experiments aiming at such low frequencies (ultra-long wavelength or ultra-low frequency) would benefit from reasonable expectations of the sky brightness distribution at relevant frequencies. In this work, we develop a radio sky model that is valid down to $\\sim1$ MHz. In addition to the discrete HII objects, we take into account the free-free absorption by thermal electrons in the Milky Way's warm ionized medium (WIM)"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.03170","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2104.03170/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2104.03170","created_at":"2026-07-05T02:53:40.433107+00:00"},{"alias_kind":"arxiv_version","alias_value":"2104.03170v2","created_at":"2026-07-05T02:53:40.433107+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.03170","created_at":"2026-07-05T02:53:40.433107+00:00"},{"alias_kind":"pith_short_12","alias_value":"5DXJWGASHAE3","created_at":"2026-07-05T02:53:40.433107+00:00"},{"alias_kind":"pith_short_16","alias_value":"5DXJWGASHAE36FHK","created_at":"2026-07-05T02:53:40.433107+00:00"},{"alias_kind":"pith_short_8","alias_value":"5DXJWGAS","created_at":"2026-07-05T02:53:40.433107+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2501.01489","citing_title":"Sub-MHz Radio Background from Ultralight Dark Photon Dark Matter","ref_index":33,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/5DXJWGASHAE36FHKM57ARRPBQS","json":"https://pith.science/pith/5DXJWGASHAE36FHKM57ARRPBQS.json","graph_json":"https://pith.science/api/pith-number/5DXJWGASHAE36FHKM57ARRPBQS/graph.json","events_json":"https://pith.science/api/pith-number/5DXJWGASHAE36FHKM57ARRPBQS/events.json","paper":"https://pith.science/paper/5DXJWGAS"},"agent_actions":{"view_html":"https://pith.science/pith/5DXJWGASHAE36FHKM57ARRPBQS","download_json":"https://pith.science/pith/5DXJWGASHAE36FHKM57ARRPBQS.json","view_paper":"https://pith.science/paper/5DXJWGAS","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2104.03170&json=true","fetch_graph":"https://pith.science/api/pith-number/5DXJWGASHAE36FHKM57ARRPBQS/graph.json","fetch_events":"https://pith.science/api/pith-number/5DXJWGASHAE36FHKM57ARRPBQS/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/5DXJWGASHAE36FHKM57ARRPBQS/action/timestamp_anchor","attest_storage":"https://pith.science/pith/5DXJWGASHAE36FHKM57ARRPBQS/action/storage_attestation","attest_author":"https://pith.science/pith/5DXJWGASHAE36FHKM57ARRPBQS/action/author_attestation","sign_citation":"https://pith.science/pith/5DXJWGASHAE36FHKM57ARRPBQS/action/citation_signature","submit_replication":"https://pith.science/pith/5DXJWGASHAE36FHKM57ARRPBQS/action/replication_record"}},"created_at":"2026-07-05T02:53:40.433107+00:00","updated_at":"2026-07-05T02:53:40.433107+00:00"}