The photon belt is reportedly a band of intense photon light that is near Earth at this time. A photon is a quantum of light, or the smallest possible packet of light at a given wavelength. It is emitted by an atom during a transition from one energy state to another.
All photons travel at the speed of light.
As fundamental particles, photons travel at the speed of light and have mass and momentum dependent on their frequencies. By classical reasoning a photon would have the apparent dualistic property of being either a particle or a wave disturbance. That is, such phenomena as interference and diffraction require an interpretation in terms of the wave characteristics of photons, but such phenomena as the Photoelectric Effect require an interpretation in terms of the particle nature of the photon. Quantum mechanics is able to resolve this dilemma by assigning probabilistic characteristics to the motions of atoms and photons. The energy associated with an individual photon is quite minute.