München 2019 – scientific programme

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SYPA: Symposium Plasma-based Particle Accelerators

SYPA 2: Sympsium Plasma-based Particle Accelerators 2

SYPA 2.3: Invited Talk

Wednesday, March 20, 2019, 17:30–18:00, Plenarsaal

Magnetic reconnection as a particle accelerator — •Michael Hesse — Birkeland Centre for Space Science, University of Bergen, Bergen, Norway

Magnetic reconnection in plasmas is an efficient mechanism to convert stored magnetic energy to particle energy in an often-explosive fashion. Particle energization can be in form of increases of thermal energy, the kinetic energy inherent in bulk plasma motion, and in form of energetic tails of particle distribution functions. Acceleration can further occur by means of direct acceleration by the reconnection electric field or by Hall-type electric fields in the current layer, by the thermalization of particle beams, and by Fermi-type acceleration in the reconnection outflow region. Finally, there is excellent theoretical and observational evidence of the generation of high-energy tails not directly associated with the reconnection process, but rather as a result of magnetic reconfigurations downstream of the reconnection outflow. This talk will consist of an overview of the magnetic reconnection process, and of the various modes of particle acceleration associated with it. Theoretical predictions will be supported by observations, in particular from spacecraft operating in the near-Earth plasma environment.