Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..393..449x&link_type=abstract
The seventh astrophysical conference: Star formation, near and far. AIP Conference Proceedings, Volume 393, pp. 449-452 (1997).
Astronomy and Astrophysics
Astrophysics
Molecular Clouds, H2 Clouds, Dense Clouds, And Dark Clouds, Magnetohydrodynamics And Plasmas, Isotropic Turbulence, Homogeneous Turbulence, Origin, Formation, Evolution, Age, And Star Formation
Scientific paper
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 Alfvénic 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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