{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:1999:Q5QS2GENCFTXQWJR5AGABCPH3P","short_pith_number":"pith:Q5QS2GEN","schema_version":"1.0","canonical_sha256":"87612d188d1167785931e80c0089e7dbd2846a17e82dfa8cf50c471817e2cbba","source":{"kind":"arxiv","id":"astro-ph/9901288","version":1},"attestation_state":"computed","paper":{"title":"A Super-Alfvenic Model of Dark Clouds","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"AAke Nordlund (Copenhagen Obs. - DK), Paolo Padoan (INAOE - MX)","submitted_at":"1999-01-21T04:58:15Z","abstract_excerpt":"Supersonic random motions are observed in dark clouds and are traditionally interpreted as Alfven waves, but the possibility that these motions are super-Alfvenic has not been ruled out. In this work we report the results of numerical experiments in two opposite regimes; M_a ~ 1 and M_a >> 1, where M_a is the initial Alfvenic Mach number --the ratio of the rms velocity to the Alfven speed. Our results show that models with M_a >> 1 are consistent with the observed properties of molecular clouds that we have tested --statistics of extinction measurements, Zeeman splitting measurements of magnet"},"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":"astro-ph/9901288","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1999-01-21T04:58:15Z","cross_cats_sorted":[],"title_canon_sha256":"83f067183bf517088f0d43018ccfa58f679d9e7d0213081ddde5252838873b5c","abstract_canon_sha256":"af521856c710e600854ce81228d13569b110cc815778c677ea1db05d9a1ae1e4"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:10:38.337082Z","signature_b64":"inWCSnFYLMCazK9rRzOhZumPAiVoTz5zUboHdVidlJ/3xnRE0oiM5MLuYof3otSkmQ1pM0Aj07AzEos0ySWZBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"87612d188d1167785931e80c0089e7dbd2846a17e82dfa8cf50c471817e2cbba","last_reissued_at":"2026-07-04T16:10:38.336626Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:10:38.336626Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A Super-Alfvenic Model of Dark Clouds","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"AAke Nordlund (Copenhagen Obs. - DK), Paolo Padoan (INAOE - MX)","submitted_at":"1999-01-21T04:58:15Z","abstract_excerpt":"Supersonic random motions are observed in dark clouds and are traditionally interpreted as Alfven waves, but the possibility that these motions are super-Alfvenic has not been ruled out. In this work we report the results of numerical experiments in two opposite regimes; M_a ~ 1 and M_a >> 1, where M_a is the initial Alfvenic Mach number --the ratio of the rms velocity to the Alfven speed. Our results show that models with M_a >> 1 are consistent with the observed properties of molecular clouds that we have tested --statistics of extinction measurements, Zeeman splitting measurements of magnet"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9901288","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/9901288/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":"astro-ph/9901288","created_at":"2026-07-04T16:10:38.336690+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9901288v1","created_at":"2026-07-04T16:10:38.336690+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9901288","created_at":"2026-07-04T16:10:38.336690+00:00"},{"alias_kind":"pith_short_12","alias_value":"Q5QS2GENCFTX","created_at":"2026-07-04T16:10:38.336690+00:00"},{"alias_kind":"pith_short_16","alias_value":"Q5QS2GENCFTXQWJR","created_at":"2026-07-04T16:10:38.336690+00:00"},{"alias_kind":"pith_short_8","alias_value":"Q5QS2GEN","created_at":"2026-07-04T16:10:38.336690+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2605.20835","citing_title":"Evolution of compressed clouds formed by filament coalescence. I. Oblique collisions","ref_index":130,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/Q5QS2GENCFTXQWJR5AGABCPH3P","json":"https://pith.science/pith/Q5QS2GENCFTXQWJR5AGABCPH3P.json","graph_json":"https://pith.science/api/pith-number/Q5QS2GENCFTXQWJR5AGABCPH3P/graph.json","events_json":"https://pith.science/api/pith-number/Q5QS2GENCFTXQWJR5AGABCPH3P/events.json","paper":"https://pith.science/paper/Q5QS2GEN"},"agent_actions":{"view_html":"https://pith.science/pith/Q5QS2GENCFTXQWJR5AGABCPH3P","download_json":"https://pith.science/pith/Q5QS2GENCFTXQWJR5AGABCPH3P.json","view_paper":"https://pith.science/paper/Q5QS2GEN","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/9901288&json=true","fetch_graph":"https://pith.science/api/pith-number/Q5QS2GENCFTXQWJR5AGABCPH3P/graph.json","fetch_events":"https://pith.science/api/pith-number/Q5QS2GENCFTXQWJR5AGABCPH3P/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/Q5QS2GENCFTXQWJR5AGABCPH3P/action/timestamp_anchor","attest_storage":"https://pith.science/pith/Q5QS2GENCFTXQWJR5AGABCPH3P/action/storage_attestation","attest_author":"https://pith.science/pith/Q5QS2GENCFTXQWJR5AGABCPH3P/action/author_attestation","sign_citation":"https://pith.science/pith/Q5QS2GENCFTXQWJR5AGABCPH3P/action/citation_signature","submit_replication":"https://pith.science/pith/Q5QS2GENCFTXQWJR5AGABCPH3P/action/replication_record"}},"created_at":"2026-07-04T16:10:38.336690+00:00","updated_at":"2026-07-04T16:10:38.336690+00:00"}