| name | qrft-2025-quasi-radial-field-tracing-open-flux |
| description | Per-entry paper-skill in wave500_coronal_source_mapping_pfss_045 (HelioSI 501-corpus). See body and metadata.yaml for paper identity and claim boundary. |
| paper | {"authors_verified":false} |
qrft-2025-quasi-radial-field-tracing-open-flux
Runtime-neutral paper-skill. Layered: (1) scientific invariants, (2) executable protocol against abstract capabilities, (3) adapter notes (optional examples only), (4) research-generation affordances.
Trigger
Reach for this skill when adaptively segmenting the open-flux corona by quasi-radial field-line tracing, producing a sharper open–closed boundary than PFSS gridded tracers.
Layer 1 — Scientific invariant
Paper identity
- Title: The Quasi-Radial Field-Line Tracing (QRaFT): An Adaptive Segmentation of the Open-Flux Solar Corona
- First author: TODO_verify
- Authors: TODO_verify
- Year: 2025
- arXiv: 2506.14894 (posted 2025-06-17)
- Journal: TODO_verify_with_full_text
- DOI: TODO_verify_with_full_text
Claim (narrow form)
QRaFT adaptive segmentation produces an open-flux mask whose boundary is more consistent with EUV-CH boundaries than the PFSS gridded tracer at matched cost.
Method assumptions
- Quasi-radial seeding is robust to small Br perturbations.
- Adaptive refinement converges to the open-closed boundary.
Data assumptions
- Synoptic Br for the relevant CR.
- EUV-CH ground truth.
Failure modes (skill memory)
- Seeding density sets the boundary sharpness.
- Quasi-radial assumption breaks near current sheets.
Figure / numerical targets
- QRaFT mask vs PFSS-gridded open-field map.
- Boundary-IoU vs EUV-CH.
Claim boundary
In scope. The studied CRs.
Out of scope — do NOT generalize:
- Do NOT use QRaFT in current-sheet-dominated regions without augmenting.
Layer 2 — Executable protocol (capability-typed)
Required capabilities (abstract)
| Capability | Purpose | Notes |
|---|
magnetogram.fetch_synoptic_br() | Br | |
pfss.solve() | PFSS | |
qraft.adaptive_segment() | QRaFT | seeding density knob |
ch.detect_from_euv() | EUV CH | |
metric.boundary_iou() | IoU | |
Procedure
- Solve PFSS.
- Run QRaFT adaptive segmentation.
- Compare boundary to EUV CH.
Validation target
Boundary IoU improvement at matched cost.
Layer 3 — Adapter / runtime notes (optional examples)
- sunkit-magex.pfss; QRaFT is paper-specific.
Layer 4 — Research-generation affordances
- Compose with [[brightness-magnetically-open-corona-2025]] for brightness-classified open-flux atlas.
- Generative hypothesis: QRaFT-OCB sharpness predicts in-situ slow-wind/OCB association sharpness ([[stansby-2025-open-closed-flux-boundary-slow-wind]]).
Skill graph → depends_on
- [[paper-stansby-2020-pfsspy-python-pfss]]
- [[brightness-magnetically-open-corona-2025]]
Links
TODOs for full-text verification
- DOI
- seeding-density convention
- comparison-cost matching