Fast Magnetic Reconnection and Energetic Particle Acceleration

Power of Turbulent Reconnection: Star Formation, Acceleration of Cosmic Rays, Heat Transfer, Flares and Gamma Ray Bursts

Turbulence is ubiquitous in astrophysical fluids. Therefore it is necessary to study magnetic reconnection in turbulent environments. The model of fast turbulent reconnection proposed in Lazarian & Vishniac 1999 has been successfully tested numerically and it suggests numerous astrophysical implications. Those include a radically new possibility of removing magnetic field from collapsing clouds which we termed "reconnection diffusion", acceleration of cosmic rays within shrinking filaments of reconnected magnetic fields, flares of reconnection, from solar flares to much stronger ones which can…

含高能粒子反馈的低β磁重联中的质子加速

Proton Acceleration in Low-beta Magnetic Reconnection with Energetic Particle Feedback

本研究针对磁重联中高能粒子在磁流体尺度的反作用研究空白，提出MHD-SDE耦合方法，发现低β磁重联下高能粒子反馈会抑制压缩结构、形成更陡的幂律能谱，证实其在磁重联与粒子加速中的关键作用。

Acceleration of Energetic Particles through Reconnection of Weakly Stochastic Magnetic Field

Astrophysical media are turbulent and therefore reconnection should be treated in the presence of pre-existing turbulence. We consider the model of fast magnetic reconnection in Lazarian & Vishniac (1999) which predicts that the rate of reconnection is controlled by the intensity and the injection scale of turbulent motions. We provide new evidence of successful testing of the model and argue that the model presents a generic set up for astrophysical reconnection events. We study particle acceleration that takes place in volumes of driven turbulence as well turbulent volumes in the presence of…

Turbulence, Reconnection and Cosmic Rays in Galaxy Clusters

Recent years have been marked by substantial changes in our understanding of magnetic turbulence and magnetic reconnection, which, in its turn induced better understanding of cosmic ray diffusion and acceleration. Current models of magnetized turbulence are no more ad hoc constructions, but numerically tested theories. In this very short review we summarize topics presented in two talks given at the conference and provide a brief sketch of the vast and rapidly developing field. We discuss how turbulence decreases the efficient mean free path of the particles in the collisionless plasmas in gal…