HR: 1330h
AN: SM23B-06    [Abstracts]
TI: Particle acceleration at a 3D reconnection site
AU: * Dalla, S
EM: s.dalla@manchester.ac.uk
AF: School of Physics and Astronomy, University of Manchester, PO Box 88, Manchester, M60 1QD United Kingdom
AU: Browning, P K
EM: philippa.browning@manchester.ac.uk
AF: School of Physics and Astronomy, University of Manchester, PO Box 88, Manchester, M60 1QD United Kingdom
AB: We study test particle trajectories in the vicinity of a three-dimensional (3D) magnetic null point during spine reconnection. Particles are injected into the steady-state non-uniform magnetic and electric fields derived by Priest and Titov (1996), and the equations of motion numerically integrated. We use input parameters typical of the solar corona, for which reconnection has been suggested as the fundamental mechanism responsible for particle acceleration in flare events. We show that substantial acceleration is possible in the 3D spine reconnection configuration, in the strong electric field regime. The energy gain is strongly dependent on the location of injection into the simulation box, as was the case in 2D X-point configurations. In our 3D geometry, we first vary the location of injection within a plane through the spine, and derive an analytical value for the injection angle for which maximum energy gain is achieved. Secondly we vary the azimuthal location of particle injection and show that as one moves away from the plane with maximum electric field magnitude, higher final energies can be achieved, though this requires substantially longer times. We also discuss application of our trajectory code to the study of particle acceleration during reconnection in the Earth's magnetotail.
DE: 7514 Energetic particles (2114)
DE: 7519 Flares
DE: 7835 Magnetic reconnection
SC: SPA-Magnetospheric Physics [SM]
MN: 2005 Joint Assembly