Angle of polarization (e-vector orientation) from Stokes parameters

$$AoP = \tfrac{1}{2}\,\mathrm{atan2}(U, Q)$$. Polarization orientation is axial (period 180 degrees); the value is returned in degrees in the half-open range (-90, 90].

Usage

angle_of_polarization(Q, U)

Arguments

Q, U

Linear polarization Stokes parameters.

Value

Angle of polarization in degrees, in (-90, 90]. The result is NA where both Q and U are zero because orientation is undefined. Scalar inputs are broadcast; incompatible lengths are rejected.

See also

degree_of_polarization

Examples

angle_of_polarization(Q = 1, U = 0)   #  0
#> [1] 0
angle_of_polarization(Q = 0, U = 1)   # 45
#> [1] 45