I know that if you have alternating current in a wire, it will produce electromagnetic waves since the electric and magnetic field change direction continuously as the wave propagates, and that the wave direction, orientation of the E component, and orientation of the B component will all be mutually perpendicular. However, this acceleration arises from changing direction of charged particles, not speed. My question is this: If I were to accelerate an electron by increasing its speed in one dimension (+x), would that electron emit EM waves? The electron will have a constant electric field pointing towards itself, and its magnetic field will be going into the page in the 1st quadrant and going out of the page in the 4th quadrant, and the magnitude of the magnetic field will be increasing. I can visualize the mutually perpendicular B and E waves, but they would not be changing orientation continuously since it isn't AC current. Would this still be an EM wave?