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Article

Properties of Hall-MHD Turbulence at Sub-Ion Scales: Spectral Transfer Analysis

1
Dipartimento di Fisica e Astronomia, Università degli Studi di Firenze, Via G. Sansone 1, 50019 Sesto Fiorentino, Italy
2
INAF—Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
3
Astronomical Institute, Czech Academy of Sciences, Bocni II 1401, 141 00 Prague, Czech Republic
4
Institute of Atmospheric Physics, CAS, Bocni II 1401, 141 00 Prague, Czech Republic
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School of Physical and Chemical Sciences, Queen Mary University of London, London E1 4NS, UK
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Department of Physics, Imperial College London, London SW7 2AZ, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Annick Pouquet
Atmosphere 2021, 12(12), 1632; https://doi.org/10.3390/atmos12121632
Received: 23 November 2021 / Accepted: 3 December 2021 / Published: 7 December 2021
(This article belongs to the Special Issue Turbulence and Energy Dissipation in Solar System Plasmas)
We present results of a multiscale study of Hall-magnetohydrodynamic (MHD) turbulence, carried out on a dataset of compressible nonlinear 2D Hall-MHD numerical simulations of decaying Alfvénic turbulence. For the first time, we identify two distinct regimes of fully developed turbulence. In the first one, the power spectrum of the turbulent magnetic fluctuations at sub-ion scales exhibits a power law with a slope of ∼−2.9, typically observed both in solar wind and in magnetosheath turbulence. The second regime, instead, shows a slope of 7/3, in agreement with classical theoretical models of Hall-MHD turbulence. A spectral-transfer analysis reveals that the latter regime occurs when the energy transfer rate at sub-ion scales is dominated by the Hall term, whereas in the former regime, the governing process is the dissipation (and the system exhibits large intermittency). Results of this work are relevant to the space plasma community, as they may potentially reconcile predictions from theoretical models with results from numerical simulations and spacecraft observations. View Full-Text
Keywords: space plasmas; turbulence; numerical simulations; energy dissipation space plasmas; turbulence; numerical simulations; energy dissipation
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MDPI and ACS Style

Papini, E.; Hellinger, P.; Verdini, A.; Landi, S.; Franci, L.; Montagud-Camps, V.; Matteini, L. Properties of Hall-MHD Turbulence at Sub-Ion Scales: Spectral Transfer Analysis. Atmosphere 2021, 12, 1632. https://doi.org/10.3390/atmos12121632

AMA Style

Papini E, Hellinger P, Verdini A, Landi S, Franci L, Montagud-Camps V, Matteini L. Properties of Hall-MHD Turbulence at Sub-Ion Scales: Spectral Transfer Analysis. Atmosphere. 2021; 12(12):1632. https://doi.org/10.3390/atmos12121632

Chicago/Turabian Style

Papini, Emanuele, Petr Hellinger, Andrea Verdini, Simone Landi, Luca Franci, Victor Montagud-Camps, and Lorenzo Matteini. 2021. "Properties of Hall-MHD Turbulence at Sub-Ion Scales: Spectral Transfer Analysis" Atmosphere 12, no. 12: 1632. https://doi.org/10.3390/atmos12121632

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