Growth or Decay – I: universality of the turbulent dynamo saturation

The turbulent small-scale dynamo (SSD) is likely to be responsible for the magnetisation of interstellar medium (ISM) that we observe in Universe today. SSD efficiently converts kinetic energy $E_{\rm kin}$ into magnetic mag} $, and often used explain how an initially weak field with \ll E_{\rm amplified, then maintained at a level \lesssim kin}$. Usually, this process studied by initialising seed letting turbulence grow it saturation. However, Part I Growth or Decay series, using three-dimensional, visco-resistive magnetohydrodynamical simulations up Reynolds numbers 2000, show same final state integral quantities, spectra, characteristic scales can also achieved if \sim even \gg This suggests saturated set material properties plasma, independent initial structure amplitude field. We discuss implications has maintenance fields plasmas future studies exploring