I've been trying to figure this out for some time. I have found some formulae on other sites that claim to allow me to calculate the magnetic component of a photon, but I have seen so many variants of the formulae that I'm skeptical about their reliability.
I am aware that a photon is an electromagnetic wave and it consists of an electric field and a magnetic field that are perpendicular to each other. Considering that they propagate each other, it would be that at certain times, the wave would be entirely electric and at other times, it would be entirely magnetic.
Would it then be possible to calculate the magnetic field strength (B-field) of the electromagnetic wave at the point of maximum amplitude (i.e. when the wave is entirely magnetic)?