期刊
ASTROPHYSICAL JOURNAL
卷 809, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0004-637X/809/1/21
关键词
methods: numerical; plasmas; turbulence
资金
- European Community's Seventh Framework Programme ([FP7]) [313038/STORM]
- MIUR-PRIN [2012P2HRCR]
- Italian Space Agency (ASI) under ASI-INAF [I/022/10/0]
Several physical and astrophysical fluid and plasma systems displaying turbulent features show a 1/k (or 1/f) spectral domain at spatial (temporal) scales above the inertial range. Here, we investigate the formation of a 1/k spectral domain in fluid and MHD turbulence systems in the sub-inertial range (k < k(0), where k(0) is the injection scale) by means of shell-model simulations. The simulation results suggest that the 1/k domain emerges as a consequence of competing direct and inverse cascading processes, implying the formation and dissipation of large-scale gradients below the inertial domain. The relevance of our results for observations in space and astrophysical contexts is briefly discussed.
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