  The low frequency magnetic field spectrum in the primordial plasma is of
particular interest as a possible origin of magnetic fields in the universe
(e.g., Tajima et al. 1992 and Cable and Tajima 1992). We derive the magnetic
field spectrum in the primordial plasma, in particular, at the epoch of
primordial nucleosynthesis. The pioneering study of Cable and Tajima (1992) of
the electromagnetic fluctuations, based on the Fluctuation-Dissipation Theorem,
is extended. Our model describes both the thermal and collisional effects in a
plasma. It is based on a kinetic description with the BGK collision term. It is
shown that the zero-frequency peak found by Cable and Tajima (1992) decreases.
At high frequencies, the blackbody spectrum is obtained naturally without the
necessity of the link procedure used by them. At low frequencies ($\omega \leq
4\omega_{pe}$, where $\omega_{pe}$ is the electron plasma frequency) it is
shown that the magnetic field spectrum has more energy than the blackbody
spectrum in vacuum.
