Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.3.44g&link_type=abstract
"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,
Physics
Scientific paper
In order to combine the macroscopic MHD configuration and microscopic particle acceleration processes in solar corona, we simulate the electric magnetic fields by means of three-dimensional MHD simulation of reconnection in solar atmosphere. We set as initial configuration of the MHD evolution a potential field extrapolated analytically from a quadrupolar photospheric magnetic field configuration chosen in a way that the resulting coronal magnetic field contains a magnetic null. With a rotating plasma motion added at the bottom of the simulation box, the photopshere, the MHD simulation reveals the evolving electric and magnetic fields. By means of a test particle calculation we obtain that protons and electrons can be accelerated to considerably non-thermal energies. We investigate the physics of the particle acceleration especially in the region near the null point where the coronal magnetic field is weakest. We obtain the spectrum of the accelerated particles and estimate the energy gains of both protons and electrons. Our simulation results suggest that photospheric plasma motion can build up electric fields in the solar atmosphere which effectively accelerate particles.
Buechner Joerg
Guo Jing
Otto Andreas
Santos José Carlos
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