Abstract
We proposed recently that the Standard Scaling Laws observed in molecular clouds are a manifestation of well-developed MHD turbulence with the energy distribution or Alfvenic fluctuating magnetic field becoming scale-independent (energy spectrum Ek∝k−1). We discuss here some known scaling laws in MHD turbulence and their possible relevance to molecular clouds. It seems that the Iroshnikov-Kraichnan law matches the Standard Scaling Laws if density is added into the analysis and virial equilibrium is assumed. We argue, however, that a more attractive alternative is the inverse turbulent cascade (from small to large scales) which is observed to occur in helical MHD turbulent systems (with tangled or multiply-connected magnetic field lines) given the fact that a lot of energy sources inject energy in the interstellar medium on small scales.
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