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It is shown that an unmagnetized nonrelativistic thermal electron-protonplasma spontaneously emits aperiodic turbulent magnetic field fluctuations ofstrength $|\delta B|=9\beta_eg^{1/3}W_e^{1/2}$ G, where $\beta_e$ is thenormalized thermal electron temperature, $W_e$ the thermal plasma energydensity and $g$ the plasma parameter. Aperiodic modes fluctuate only in space,but are not propagating. For the unmagnetized intergalactic medium, immediatelyafter the reionization onset, the field strength from this mechanism is about$4.7\cdot 10^{-16}$ G, too weak to affect the dynamics of the plasma. The shearand/or compression of the intergalactic medium exerted by the first supernovaexplosions amplify these seed fields and make them anisotropic, until themagnetic restoring forces affect the gas dynamics at ordered plasma betas nearunity.

Cosmic magnetization: from spontaneously emitted aperiodic turbulent to ordered equipartition fields