| name | nayak-2024-coronal-null-extrapolation-generation-annihilation |
| 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} |
nayak-2024-coronal-null-extrapolation-generation-annihilation
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 cataloguing 3-D magnetic-null generation/annihilation events in NLFFF + PFSS sequences.
Layer 1 — Scientific invariant
Paper identity
- Title: Generation and Annihilation of Three-Dimensional Magnetic Nulls in Extrapolated Solar Coronal Magnetic Field
- First author: TODO_verify
- Authors: TODO_verify
- Year: 2024
- arXiv: 2404.12034 (posted 2024-04-18)
- Journal: TODO_verify_with_full_text
- DOI: TODO_verify_with_full_text
Claim (narrow form)
3-D null pair generation/annihilation in NLFFF+PFSS extrapolations follows a statistically robust rate set by AR flux-emergence cadence, with isolated null lifetimes consistent with reconnection-event durations.
Method assumptions
- Null detection is converged at the chosen grid.
- Null lifetimes are robust to small parameter perturbations.
Data assumptions
- HMI vector + LoS Br time series.
- Synoptic Br for PFSS.
Failure modes (skill memory)
- Null counts depend on resolution.
- AR-edge nulls are spurious if NLFFF boundary is unstable.
Figure / numerical targets
- Null-generation/annihilation rate vs flux-emergence.
- Null-lifetime distribution.
Claim boundary
In scope. Studied AR sequences.
Out of scope — do NOT generalize:
- Do NOT cite null statistics without grid resolution and NLFFF boundary preparation.
Layer 2 — Executable protocol (capability-typed)
Required capabilities (abstract)
| Capability | Purpose | Notes |
|---|
magnetogram.fetch_hmi_vector() | HMI vector | |
pfss.solve() | background | |
nlfff.solve() | AR volume | |
topology.identify_nulls_3d() | null catalog | |
topology.track_null_lifetime() | lifetime tracker | |
Procedure
- Solve PFSS+NLFFF time sequence.
- Identify 3-D nulls at each step.
- Track null lifetimes.
- Correlate with flux-emergence.
Validation target
Reproduce null-rate vs flux-emergence relation.
Layer 3 — Adapter / runtime notes (optional examples)
- sunkit-magex.pfss; NLFFF code paper-specific.
Layer 4 — Research-generation affordances
- Compose with [[mackay-2026-tracking-magnetic-topology-change-corona]] for a unified null+separator topology timeline.
- Generative hypothesis: null-rate fingerprints sympathetic-flare preferred separations.
Skill graph → depends_on
- [[mackay-2026-tracking-magnetic-topology-change-corona]]
- [[flare-precursor-fine-scale-topology-extrapolation]]
Links
TODOs for full-text verification
- lead author
- DOI
- null detection algorithm
- grid resolution