Energetic particle transport in the presence of magnetic turbulence: influence of spectral extension and intermittency

Coronal Heating Topology: The Interplay of Current Sheets and Magnetic Field Lines

“…FLRW in turbulent fields is a topic of intense research (Jokipii & Kota 1989;Zimbardo et al 2000;Snodin et al 2013;Beresnyak 2013), but little attention has been dedicated to the effects of spatial intermittency and coherent structures (Pucci et al 2016). However, the plasma thermodynamical properties are strongly affected by the topology of field lines originating in current sheets, both in the corona and solar wind.…”

Tempered Lévy walk of charged particles in turbulent magnetic field

“…Superdiffusive regime is obtained also in the composite turbulence model [5]. Pucci et al [6] indicate very narrow spectral turbulence range used in previous works [9] and consider wide range. Using the p-model, they simulate turbulent magnetic field as a superposition of spatially localized fluctuations of magnetic field on different scales [6].…”

“…Particularly for protons, superdiffusion and normal diffusion parallel to the mean magnetic field were declared, simulation also predicts transient superdiffusive behavior. We interpret parallel motion in terms of the one-dimensional tempered Lévy walk process and show that this representation is consistent with the experimental and simulated results.In [1][2][3][4][5][6], different transport regimes of parallel and perpendicular diffusion of charged particles in turbulent magnetic field (TMF) were predicted among which are normal diffusion, ballistic motion, super-and subdiffusion. It is ascertained that the transport of charged particles in turbulent magnetic field is defined by several parameters, such as turbulence level δB/B 0 , turbulence anisotropy, and ratio of Larmor radius R L to correlation length l c .…”

“…Pucci et al [6] indicate very narrow spectral turbulence range used in previous works [9] and consider wide range. Using the p-model, they simulate turbulent magnetic field as a superposition of spatially localized fluctuations of magnetic field on different scales [6]. The obtained spectrum of generated turbulence is isotropic with adjustable spectral index.…”

“…Authors of [6] calculated time dependencies of diffusion coefficients D ⊥ (t) and D (t) and observed tempered power law form of pdf ρ(τ ) of time between consecutive inversions of parallel velocity sign. The form of D (t) and ρ(τ ) indicate realization of the tempered Lévy statistics [10,11].…”