  This paper suggests the idea that all neutron stars experienced at birth an
ultrafast decay of their magnetic fields from their initial values to their
current surface values. If the electromagnetic energy radiated during this
field decay is converted into kinetic energy of the neutron star via the
radiation reaction mechanism then the decay time is of the order of 10^(-4)s
provided that the initial magnetic fields lie in the range of 10^(14)-10^(16)G.
This means that all neutron stars are born with magnetic fields typical of
magnetars. According to this model the neutron stars acquire their observed
high space velocities during the birth ultrafast decay of their magnetic
fields. The origin of this field decay points to magnetic instabilities
occurring at the end of the birth process.
