Energy transfer of imbalanced Alfvénic turbulence in the heliosphere

Liping Yang, Jiansen He (), Daniel Verscharen, Hui Li, Trevor A. Bowen, Stuart D. Bale, Honghong Wu, Wenya Li, Ying Wang, Lei Zhang, Xueshang Feng and Ziqi Wu
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Liping Yang: Chinese Academy of Sciences
Jiansen He: Peking University
Daniel Verscharen: University College London
Hui Li: Los Alamos National Laboratory
Trevor A. Bowen: University of California
Stuart D. Bale: University of California
Honghong Wu: Wuhan University
Wenya Li: Chinese Academy of Sciences
Ying Wang: Peking University
Lei Zhang: China Academy of Aerospace Science and Innovation
Xueshang Feng: Chinese Academy of Sciences
Ziqi Wu: Peking University

Nature Communications, 2023, vol. 14, issue 1, 1-13

Abstract: Abstract Imbalanced Alfvénic turbulence is a universal process playing a crucial role in energy transfer in space, astrophysical, and laboratory plasmas. A fundamental and long-lasting question about the imbalanced Alfvénic turbulence is how and through which mechanism the energy transfers between scales. Here, we show that the energy transfer of imbalanced Alfvénic turbulence is completed by coherent interactions between Alfvén waves and co-propagating anomalous fluctuations. These anomalous fluctuations are generated by nonlinear couplings instead of linear reflection. We also reveal that the energy transfer of the waves and the anomalous fluctuations is carried out mainly through local-scale and large-scale nonlinear interactions, respectively, responsible for their bifurcated power-law spectra. This work unveils the energy transfer physics of imbalanced Alfvénic turbulence, and advances the understanding of imbalanced Alfvénic turbulence observed by Parker Solar Probe in the inner heliosphere.

Date: 2023
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DOI: 10.1038/s41467-023-43273-4

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