In the context of space and astrophysical plasma turbulence and particle heating, several vocabularies emerge for estimating turbulent energy dissipation rate, including KolmogorovYaglom third-order law and, in its various forms, j . E (work done by the electromagnetic field on particles), and – (P . del) . u (pressure-strain interaction), to name a couple. It is now understood that these energy transfer channels, to some extent, are correlated with coherent structures. In particular, we find that different energy dissipation proxies, although not point-wise correlated, are concentrated in proximity to each other, for which they decorrelate in a few ion inertial scales. However, the energy dissipation proxies dominate at different scales. For example, there is an inertial range over which the third-order law is meaningful. Contributions from scale bands stemming from scale-dependent spatial filtering show that the energy exchange through j . E mainly results from large scales, while the energy conversion from fluid flow to internal through – (P . del) . u dominates at small scales.
Scale dependence of energy transfer in turbulent plasma
Yang, Yan; Wan, Minping; Matthaeus, William H.; Sorriso-Valvo, Luca; Parashar, Tulasi N.; Lu, Quanming; Shi, Yipeng; Chen, Shiyi
ID | 415455 |
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DOI | 10.1093/mnras/sty2977 |
PRODUCT TYPE | Journal Article |
LAST UPDATE | 2022-01-24T12:22:52Z |