Relativistic Rotating Electromagnetic Fields

Figure 1

Speed of the vanishing Poynting vector observers for a rigidly rotating magnetic dipole. Inside the light cylinder, , the electromagnetic field is of the pure magnetic type and rotates rigidly with a subluminal speed , on the light cylinder, , the field is of the pure null type and rotates with the speed of light, and outside the light cylinder, , the electromagnetic field is of the pure electric type and rotates differentially with a subluminal speed. Here, is the cylindrical radial coordinate.