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| Titel |
Numerical simulation of particle acceleration in the solar corona above active regions |
| VerfasserIn |
Xiaowei Zhou, Jan Skála, Joerg Buechner, Weiqun Gan, Simimg Liu |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250076685
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| Zusammenfassung |
| Recent solar observations have provided important information about particle acceleration
above active regions in the course of solar flares. Although many models have been
proposed the many questions still remain open. We use different relativistic test
particle approaches to study the acceleration mechanisms by magnetic reconnection.
We choose to calculate the full particle trajectories by two different codes as well
as an approach calculating the motion of the guiding center . The magnetic and
electric fields are obtained from MHD simulations of the active region dynamics
using subgrid information to calculate the accelerating electric fields. Our MHD
simulations are based on the observations. The initial magnetic field is extrapolated from
magnetogram of active region. The particles are most efficiently accelerated by
the parallel component of electric field. We investigate the particle acceleration in
dependence on various subgrid models dependent on the current carrier velocity.. In
particular we studied the dependence of the acceleration time and the energy gain of
particles as well as their energy distribution needed to calculate the Hard X-ray
spectrum to be compared with the observations of the RHESSI solar X-ray telescope. |
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