| name | deforest-2024-flux-fluxon-coronal-modeling |
| 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. |
deforest-2024-flux-fluxon-coronal-modeling
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 modelling the coronal field with fluxons (discrete flux-tube primitives) rather than a grid, particularly when sub-grid topology matters.
Layer 1 — Scientific invariant
Paper identity
- Title: Field Line Universal relaXer (FLUX): A Fluxon Approach to Coronal Magnetic Field Modeling
- First author: C. E. DeForest
- Authors: C. E. DeForest, TODO_verify
- Year: 2024
- arXiv: 2402.10370 (posted 2024-02-15)
- Journal: TODO_verify_with_full_text
- DOI: TODO_verify_with_full_text
Claim (narrow form)
The FLUX fluxon model reproduces PFSS open-field maps at comparable cost while exposing sub-grid topology (e.g., fluxon entrapment in active-region complexes) that gridded PFSS smears out.
Method assumptions
- Photospheric Br can be decomposed into discrete flux elements.
- Fluxon relaxation converges to a force-free / potential state within tolerance.
- Fluxon density is sufficient to resolve relevant topology.
Data assumptions
- Synoptic or full-disk Br.
- Optional EUV imagery for validation.
Failure modes (skill memory)
- Fluxon-count insufficient for AR-rich CRs.
- Relaxation can stall in nontrivial topologies.
- Comparison to gridded PFSS depends on density-equivalent.
Figure / numerical targets
- Fluxon open-field map vs PFSS open-field map.
- Fluxon connectivity diagram for an AR complex.
- Cost-vs-resolution table.
Claim boundary
In scope. FLUX as released; representative CRs.
Out of scope — do NOT generalize:
- Do NOT cite FLUX for current-carrying NLFFF problems without a non-potential extension.
- Do NOT compare FLUX to PFSS at incompatible resolutions.
Layer 2 — Executable protocol (capability-typed)
Required capabilities (abstract)
| Capability | Purpose | Notes |
|---|
magnetogram.fetch_synoptic_br() | Br | |
fluxon.decompose_br() | Br→fluxons | density knob |
fluxon.relax_to_potential() | FLUX relaxation | |
fluxon.open_field_map() | open-field map | |
pfss.solve() | reference PFSS | |
Procedure
- Decompose Br into fluxons.
- Relax to potential state.
- Build fluxon open-field map.
- Compare to gridded PFSS at matched effective resolution.
Validation target
Match gridded-PFSS open-field map at convergence.
Layer 3 — Adapter / runtime notes (optional examples)
- FLUX is a paper-specific code; sunkit-magex.pfss for reference.
Layer 4 — Research-generation affordances
- Compose with [[raouafi-2025-switchback-coronal-jet-precursors]] — fluxon connectivity should expose jet-driven switchback footpoints missed by gridded PFSS.
- Generative hypothesis: fluxon-density convergence rate is a topology-complexity diagnostic at the CR level.
Skill graph → depends_on
- [[paper-stansby-2020-pfsspy-python-pfss]]
Links
TODOs for full-text verification
- DOI
- FLUX version
- fluxon-density convention