FN_FLUX

FN_FLUX = <Quantity 18656580.36696852 erg / (s cm2)>

Surface energy flux normalization for MAS.

\(F_0 = P_0\,V_0\) in erg cm⁻² s⁻¹. This scale governs the Poynting flux, enthalpy flux, and wave-energy flux that appear in the energy equation boundary conditions.