• DOI:10.3847/2041-8213/ac11fd
• Corpus ID: 235765520

Spacetime Hall-MHD Turbulence at Sub-ion Scales: Structures or Waves?

@article{Papini2021SpacetimeHT,
  title={Spacetime Hall-MHD Turbulence at Sub-ion Scales: Structures or Waves?},
  author={Emanuele Papini and Antonio Cicone and Luca Franci and Mirko Piersanti and Simone Landi and Petr Hellinger and Andrea Verdini},
  journal={The Astrophysical Journal Letters},
  year={2021},
  volume={917}
}

• E. Papini, A. Cicone, +4 authors A. Verdini
• Published 8 July 2021
• Physics
• The Astrophysical Journal Letters

Spatiotemporal properties of two-dimensional (2D) Hall-magnetohydrodynamic (MHD) turbulence at intermediate plasma β = 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 Alfvén 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.