True, it is a force-free helical steady-state solution of the Euler's equation in fluid dynamics. It does represent a physical situation as if you set A=1,B=1 and C=1, it represents a kinetic dynamo and this field is present in the solar corona as well. It has a regular and chaotic trajectory...
Can somebody please post the derivation of the ABC magnetic field components whose magnetic field components in the three cartesian directions(B1, B2, B3) are given by the following:
B1=A*sin(z)+C*cos(y)
B2=B*sin(x)+A*cos(z)
B3=C*sin(y)+B*cos(x)