期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 917, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/ac11fd
关键词
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资金
- Italian Space Agency [2020-31-HH.0]
- UK Science and Technology Facilities Council (STFC) [ST/T00018X/1]
- Programme National PNST of CNRS/INSU
- CNES
- Fondazione Cassa di Risparmio di Firenze under the project HIPERCRHEL
- INAF [INA20_C6A55]
- CINECA [HP10C2EARF, HP10C4A4M2]
- computing center of CINECA
The study shows that at intermediate plasma beta, the dynamics of 2D Hall-MHD turbulence at sub-ion scales is mainly driven by localized intermittent structures, with no significant contribution of wavelike fluctuations.
Spatiotemporal properties of two-dimensional (2D) Hall-magnetohydrodynamic (MHD) turbulence at intermediate plasma beta = 2 are studied by means of Fast Iterative Filtering (FIF), a new technique for the decomposition of nonstationary nonlinear signals. Results show that the magnetic energy at sub-ion scales is concentrated in perturbations with frequencies smaller than the ion-cyclotron (IC) frequency and with polarization properties that are incompatible with both kinetic Alfven waves (KAWs) and IC waves. At higher frequencies, we clearly identify signatures of both whistler waves and KAWs; however, their energetic contribution to the magnetic power spectrum is negligible. We conclude that the dynamics of 2D Hall-MHD turbulence at sub-ion scales is mainly driven by localized intermittent structures, with no significant contribution of wavelike fluctuations.
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