| name | finley-2023-differential-rotation-angular-momentum-loss |
| 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. |
finley-2023-differential-rotation-angular-momentum-loss
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 including differential rotation in angular-momentum-loss-rate calculations on top of PFSS-derived open-flux maps.
Layer 1 — Scientific invariant
Paper identity
- Title: Accounting for Differential Rotation in Calculations of the Sun's Angular Momentum-Loss Rate
- First author: A. J. Finley
- Authors: A. J. Finley, TODO_verify
- Year: 2023
- arXiv: 2302.12700 (posted 2023-02-24)
- Journal: TODO_verify_with_full_text
- DOI: TODO_verify_with_full_text
Claim (narrow form)
Differential rotation modifies the inferred angular-momentum-loss rate by a measurable fraction relative to rigid-rotation assumptions, when paired with PFSS-derived open-flux maps.
Method assumptions
- Differential-rotation profile is well-characterized.
- Open-flux map is consistent with the rotation profile.
Data assumptions
- Synoptic Br + PFSS open-flux map.
- Rotation profile from helioseismology or surface tracers.
Failure modes (skill memory)
- Rotation-profile uncertainty propagates into the loss-rate.
- PFSS R_ss sets the open-flux baseline.
Figure / numerical targets
- Loss-rate vs differential vs rigid rotation.
- Latitude-resolved loss-rate density.
Claim boundary
In scope. The studied cycle window.
Out of scope — do NOT generalize:
- Do NOT cite differential-rotation correction outside the studied latitude band.
Layer 2 — Executable protocol (capability-typed)
Required capabilities (abstract)
| Capability | Purpose | Notes |
|---|
rotation.differential_profile() | rotation profile | |
pfss.solve() | open-flux map | |
torque.with_diff_rotation() | loss-rate calc | |
Procedure
- Fetch rotation profile.
- Solve PFSS; obtain open-flux map.
- Compute loss-rate with and without differential rotation.
- Tabulate the differential correction.
Validation target
Reproduce the differential vs rigid correction.
Layer 3 — Adapter / runtime notes (optional examples)
- sunkit-magex.pfss; rotation profile via paper-specific source.
Layer 4 — Research-generation affordances
- Compose with [[ervin-2025-alfven-surface-wind-braking-psp]] for differential-rotation effects in the Alfvén-surface wind-braking estimate.
- Generative hypothesis: differential-rotation corrections rank-correlate with the equatorial-dipole share of OSF ([[tahtinen-2026-dipole-flux-transport-open-flux]]).
Skill graph → depends_on
- [[ervin-2025-alfven-surface-wind-braking-psp]]
- [[tahtinen-2026-dipole-flux-transport-open-flux]]
- [[paper-stansby-2020-pfsspy-python-pfss]]
Links
TODOs for full-text verification
- DOI
- rotation-profile source
- headline correction magnitude