Solar Physics Examples
Worked examples, sanity checks, and small applications.
Example: choosing the right baseline
Question: If NF2 produces a magnetic field for AR 11158, what is the first baseline to compare against?
Answer: a potential-field model using the same normal boundary flux. It is current-free and low-energy, so any useful NLFFF/NF2 result should justify its extra complexity by showing credible non-potential structure, free energy, or better physical diagnostics.
Example: recognising the NF2 boundary components
For the AR 11158 smoke test, the JSOC query was:
hmi.sharp_cea_720s[377][2011.02.15_00:00:00_TAI]{Br,Bt,Bp,Br_err,Bt_err,Bp_err}NF2’s CEA loader maps this approximately as:
Bx = Bp
By = -Bt
Bz = BrSo if a boundary plot looks sign-flipped in the transverse direction, check the coordinate convention before assuming the data are wrong.
Example: smoke test versus science run
The local AR 11158 smoke run verifies the pipeline: JSOC data access, FITS loading, coordinate mapping, training loop, checkpointing, and .nf2 output.
It does not prove the extrapolated magnetic field is scientifically meaningful, because the run is deliberately tiny. For science, use NF2 diagnostics for physical credibility.