Abstract
Nonmagnetized, fully ionized plasmas spontaneously emit aperiodic turbulent magnetic field fluctuations. Its fluctuation intensities are dominated by the contribution from a recently discovered collective, damped mode, which modifies the earlier estimate of the total magnetic field strength in a thermal nonrelativistic electron-proton plasma to G, where g denotes the plasma parameter and β e the thermal electron velocity in units of the speed of light, in the case of no collisional damping. Accounting for simultaneous viscous damping reduces the estimate to |δB|eq = 2305g(nemec 2)1/2 G, depending only on the plasma parameter g and the electron density ne . For the unmagnetized intergalactic medium, immediately after the reionization onset the field strengths from this mechanism are about 6.8 × 10–13 G for no collisional damping and 1.5 × 10–16 G for viscous damping. Maximum spatial scales of 1015 cm of the emitted aperiodic fluctuations in cosmic voids are possible.
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