| name | jiang-2024-nested-active-regions-hcs-reversal |
| 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} |
jiang-2024-nested-active-regions-hcs-reversal
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 explaining HCS-reversal stalls during cycle maximum by anchoring at nested active-region complexes, identifiable by PFSS+SFT modelling.
Layer 1 — Scientific invariant
Paper identity
- Title: Nested Active Regions Anchor the Heliospheric Current Sheet and Stall the Reversal of the Coronal Magnetic Field
- First author: TODO_verify
- Authors: TODO_verify
- Year: 2024
- arXiv: 2410.18244 (posted 2024-10-23)
- Journal: TODO_verify_with_full_text
- DOI: TODO_verify_with_full_text
Claim (narrow form)
Nested-AR emergence anchors the HCS at preferred longitudes and stalls polar-field reversal — operationally identifiable via PFSS HCS contours and SFT-driven polar-field tracking.
Method assumptions
- Nested ARs are identifiable in HMI synoptic Br.
- PFSS HCS is a meaningful proxy for in-situ HCS anchor longitude.
- SFT correctly evolves polar field given the BMR catalog.
Data assumptions
- HMI synoptic Br across the studied maximum.
- BMR/AR catalog with emergence locations.
Failure modes (skill memory)
- AR catalog completeness varies; missing ARs erase the anchor.
- PFSS HCS is sensitive to R_ss.
- SFT meridional-flow knob changes the reversal-stall claim.
Figure / numerical targets
- PFSS HCS longitude vs time.
- Polar field vs time with stall windows.
- Nested-AR overlay on HCS contour.
Claim boundary
In scope. Cycle-maximum interval studied in the paper.
Out of scope — do NOT generalize:
- Do NOT extend to cycle minima.
- Do NOT cite the anchor mechanism for isolated single ARs.
Layer 2 — Executable protocol (capability-typed)
Required capabilities (abstract)
| Capability | Purpose | Notes |
|---|
magnetogram.fetch_synoptic_br() | HMI synoptic Br | |
ar.identify_nested() | nested-AR catalog | |
pfss.solve() | PFSS | |
hcs.extract() | HCS contour | |
sft.polar_field() | polar-field time series | |
Procedure
- Build nested-AR catalog over the cycle window.
- Solve PFSS per CR; extract HCS contour.
- Run SFT for polar-field evolution.
- Correlate nested-AR longitude with HCS-stall longitude.
Validation target
Reproduce the longitude-locked HCS stalls.
Layer 3 — Adapter / runtime notes (optional examples)
- sunkit-magex.pfss; SFT is paper-internal.
Layer 4 — Research-generation affordances
- Compose with [[yoshida-2026-sunspot-evolution-open-flux-cycle24-max]]: AR 12192 nested-AR effects vs OSF rise.
- Generative hypothesis: anchor longitudes should leave a fingerprint on sympathetic flares ([[milligan-2024-flares-sympathetic-angular-separation]]).
Skill graph → depends_on
- [[yoshida-2026-sunspot-evolution-open-flux-cycle24-max]]
- [[paper-stansby-2020-pfsspy-python-pfss]]
Links
TODOs for full-text verification
- lead author
- DOI
- nested-AR definition
- SFT parameters