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EP: Fachverband Extraterrestrische Physik
EP 4: Poster Session
EP 4.30: Poster
Dienstag, 26. Februar 2013, 11:15–12:45, Poster OG
Particle acceleration in the solar corona above active regions — •Xiaowei Zhou1,2, Jan Skala2, Joerg Buechner2, Siming Liu1, and Weiqun Gan1 — 1PMO, Nanjing, China — 2MPS, Lindau, Germany
Recent solar observations gave important clues about the particle acceleration in solar flares. Many models have been investigated, but the many questions still remain. In our contribution we present relativistic test particle approach to study the acceleration mechanisms by magnetic reconnection.
We choose a relativistic guiding center approach, because particles are adiabatic along the magnetic field and the details of the particle trajectories is not important for our study.
The magnetic and electric fields are obtained from resistive MHD numerical simulations. The particles can be effectively accelerated by the parallel component of electric field Ejj. Our MHD simulations are based on the observations. The initial magnetic field is extrapolated from magnetogram of active region.
We investigate various models of anomalous resistivity dependent on the current carrier velocity. We compared the particle acceleration in different models. We studied the dependence of acceleration times and energy gains for ions and as well as their energy distribution needed to calculate the Hard X-ray spectrum to be compared with the observations of RHESSI.