Scalar potential of a point charge shortly after exiting a dipole magnet, moving left to right.
One can see the synchrotron radiation wave front pull away from the electron (actually positron, since the scalar potential is positive). It's only moving 0.9 times the speed of light though. Otherwise the height of the wavefront diverges towards infinity while its width shrinks to zero. The observer is moving along with the positron, which is why it stays in the middle.
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