Pulsars are rotating neutron stars with a magnetic field that is tilted to the axis of rotation, which causes modulation of the radiation coming to Earth. With a colossal magnetic field and a tremendous speed of rotation, charged particles are ejected from the surface of a neutron star and accelerated almost to light speeds. However, only near the magnetic poles will the plasma move away from the pulsar along the magnetic field lines. This plasma is the source of radio emission from pulsars.
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