Particle Acceleration and Heating by Turbulent Reconnection

Abstract

Turbulent flows in the solar wind, large scale current sheets, multiple current sheets, and shock waves lead to the formation of environments in which a dense network of current sheets is established and sustains "turbulent reconnection". We constructed a 2D grid on which a number of randomly chosen grid points are acting as scatterers (i.e. magnetic clouds or current sheets). Our goal is to examine how test particles respond inside this large scale collection of scatterers. We study the energy gain of individual particles, the evolution of their energy distribution and their escape time distribution. We have developed a new method to estimate the transport coefficients from the dynamics of the interaction of the particles with the scatterers. Replacing the "magnetic clouds" with current sheets, we have proven that the energization processes can be more efficient depending on the strength of the effective electric fields inside the current sheets and their statistical properties. Using the estimated transport coefficients and solving the Fokker-Planck (FP) equation we can recover the energy distribution of the particles only for the sstochastic Fermi process. We have shown that the evolution of the particles inside a turbulent reconnecting volume is not a solution of the FP equation, since the interaction of the particles with the current sheets is "anomalous", in contrast to the case of the second order Fermi process.

6 pages, 8 figures, in press at Astrophysical Journal Letters (2016)

References in corpus (2)

• Formation of Hard Power-laws in the Energetic Particle Spectra Resulting from Relativistic Magnetic Reconnection
• Stochastic Acceleration in Turbulent Electric Fields Generated by 3-D Reconnection

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• The Role of Energy Diffusion in the Deposition of Energetic Electron Energy in Solar and Stellar Flares
• Superdiffusive Stochastic Fermi Acceleration in Space and Energy
• Small electron acceleration episodes in the solar corona
• Probing solar flare accelerated electron distributions with prospective X-ray polarimetry missions
• Rapid Variability in the SOL2011-08-04 Flare: Implications for Electron Acceleration
• Stochastic Turbulent Acceleration in a fractal environment
• Synergy of stochastic and systematic energization of plasmas during turbulent reconnection
• Stochastic Fermi Energization of Coronal Plasma during explosive magnetic energy release
• Diffusive Shock Acceleration and Turbulent Reconnection
• Shock-reflected electrons and X-ray line spectra