{"paper":{"title":"FastQSL 2: A Comprehensive Toolkit for Magnetic Connectivity Analysis","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"FastQSL 2 traces magnetic field lines over the full sphere by switching to a second coordinate system near the poles.","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Chaowei Jiang, Jun Chen, Li Feng, Rui Liu, Thomas Wiegelmann","submitted_at":"2026-04-17T16:04:17Z","abstract_excerpt":"We present a new version of FastQSL for locating quasi-separatrix layers (QSLs) -- regions characterized by strong magnetic connectivity gradients, preferential current buildup, and subsequent magnetic reconnection. This version now supports spherical coordinates, utilizing a second spherical coordinate system for tracing magnetic field lines around the polar regions. This approach completely resolves the singularity problem at the two poles. Furthermore, our code accommodates arbitrary mesh shapes for output, can provide both magnetic field and electric current density on the mesh, and can sa"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"This version now supports spherical coordinates, utilizing a second spherical coordinate system for tracing magnetic field lines around the polar regions. This approach completely resolves the singularity problem at the two poles.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That numerical field-line integration remains accurate and stable across the full sphere when switching between the two coordinate systems, with no quantified error analysis or validation against known analytic solutions provided in the abstract.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"FastQSL 2 extends prior magnetic connectivity software with spherical coordinate support that eliminates polar singularities, arbitrary output meshes, and direct computation of field lines plus current density for solar applications.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"FastQSL 2 traces magnetic field lines over the full sphere by switching to a second coordinate system near the poles.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"0dccd168d34f779a1e4778ba3fd68f1168e57240a600444c359583c307f12127"},"source":{"id":"2604.16195","kind":"arxiv","version":2},"verdict":{"id":"de2f3c6c-f1d3-4351-a78e-122eb0e4ab98","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-10T07:14:44.834376Z","strongest_claim":"This version now supports spherical coordinates, utilizing a second spherical coordinate system for tracing magnetic field lines around the polar regions. This approach completely resolves the singularity problem at the two poles.","one_line_summary":"FastQSL 2 extends prior magnetic connectivity software with spherical coordinate support that eliminates polar singularities, arbitrary output meshes, and direct computation of field lines plus current density for solar applications.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That numerical field-line integration remains accurate and stable across the full sphere when switching between the two coordinate systems, with no quantified error analysis or validation against known analytic solutions provided in the abstract.","pith_extraction_headline":"FastQSL 2 traces magnetic field lines over the full sphere by switching to a second coordinate system near the poles."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2604.16195/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"}