Turbulence and Instabilities in Fluids and Plasmas

A special issue of Atmosphere (ISSN 2073-4433). This special issue belongs to the section "Atmospheric Techniques, Instruments, and Modeling".

Deadline for manuscript submissions: closed (30 November 2020) | Viewed by 2743

Special Issue Editor


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Guest Editor
Department of Physics, Università della Calabria, 87036 Arcavacata di Rende, Italy
Interests: space physics; solar corona; magnetohydrodynamics; turbulence; waves; instabilities; numerical simulations; kinetic effects; plasma physics

Special Issue Information

Dear Colleagues,

The aim of this Special Issue is to present recent achievements in the dynamics of turbulent fluids and plasma  and their interplay with instabilities. This kind of phenomenon is found in various natural contexts and in different regimes, for instance, in the Earth's magnetosphere, where the establishment of a turbulent state follows Kelvin–Helmholtz or tearing instabilities; in the solar wind plasma, where turbulent fluctuations at ion scales can generate plasma micro-instabilities and out-of-equilibrium features; or in the solar atmosphere, where new observations and theoretical modeling are revealing complex turbulent dynamics, strongly influenced by the presence of inhomogeneities in the background medium and complex magnetic topologies. These processes can strongly affect the transport of energetic particles, with repercussions on space weather predictions. They can provide clues that are useful to singling out the most relevant dissipative processes that occur in low-collisional plasmas.

This Special Issue will gather original research on the outlined topics, as well as review papers, with applications to both plasma and fluid contexts. Studies based on theoretical approaches, both analytical and/or numerical, as well as on data analysis will be included.

Prof. Dr. Francesco Malara
Guest Editor

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Keywords

  • turbulence
  • instabilities
  • space plasmas
  • geophysical fluids
  • numerical simulations

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Published Papers (1 paper)

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Research

11 pages, 711 KiB  
Article
The Influence of Magnetic Turbulence on the Energetic Particle Transport Upstream of Shock Waves
by Silvia Perri, Giuseppe Prete, Francesco Malara, Francesco Pucci and Gaetano Zimbardo
Atmosphere 2021, 12(4), 508; https://doi.org/10.3390/atmos12040508 - 17 Apr 2021
Cited by 6 | Viewed by 2231
Abstract
Energetic particles are ubiquitous in the interplanetary space and their transport properties are strongly influenced by the interaction with magnetic field fluctuations. Numerical experiments have shown that transport in both the parallel and perpendicular directions with respect to the background magnetic field is [...] Read more.
Energetic particles are ubiquitous in the interplanetary space and their transport properties are strongly influenced by the interaction with magnetic field fluctuations. Numerical experiments have shown that transport in both the parallel and perpendicular directions with respect to the background magnetic field is deeply affected by magnetic turbulence spectral properties. Recently, making use of a numerical model with three dimensional isotropic turbulence, the influence of turbulence intermittency and magnetic fluctuations on the energetic particle transport was investigated in the solar wind context. Stimulated by this previous theoretical work, here we analyze the parallel transport of supra-thermal particles upstream of interplanetary shock waves by using in situ particle flux measurements; the aim was to relate particle transport properties to the degree of intermittency of the magnetic field fluctuations and to their relative amplitude at the energetic particle resonant scale measured in the same regions. We selected five quasi-perpendicular and five quasi-parallel shock crossings by the ACE satellite. The analysis clearly shows a tendency to find parallel superdiffusive transport at quasi-perpendicular shocks, with a significantly higher level of the energetic particle fluxes than those observed in the quasi-parallel shocks. Furthermore, the occurrence of anomalous parallel transport is only weakly related to the presence of magnetic field intermittency. Full article
(This article belongs to the Special Issue Turbulence and Instabilities in Fluids and Plasmas)
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