bfieldtools.sphtools.field¶

bfieldtools.sphtools.field(p, acoeffs, bcoeffs, lmax, normalization='default', R=1)¶

Computes magnetic field at some point from the sph coefficients.

Ignores the ‘DC’ component l=0.

Parameters

p: Nx3 array: coordinates in which the potential is computed
acoeffs: lmax*(lmax+2)x1 array: spectral coefficients of r**l terms
bcoeffs: lmax*(lmax+2)x1 array: spectral coefficients of r**(-l) terms
lmax: int: maximum degree l which is used in computing
normalization: string: “default”: the fields correspond to normalized magnetic potential. “unit”: the fields are normalized w.r.t integration over the unit sphere. “energy”: each term in inner/outer basis function with respect to sphere with radius R is normalized to unit energy
R: float: Sphere radius that separates inner/outer components

Returns