This review, far from exhaustive, focuses on the specific properties of molecular clouds in their least condensed phase Emphasis is placed on their connection with the diffuse medium, their multi-fractal characteristics and the diversity of their small-scale structure, where cold and dense gas may coexist with dilute and warm gas. Stuctures of essentially pure velocity origin are uncovered and seen as a possible signature of the intermittency of turbulence dissipation.
Keywordsmolecular clouds turbulence fractals intermittency magnetic fields
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