Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-12-09
Astron.Astrophys.432:1049-1056,2005
Astronomy and Astrophysics
Astrophysics
9 pages, 9 figures; accepted for publication in Astronomy and Astrophysics
Scientific paper
10.1051/0004-6361:20041675
We propose a model for the acceleration of charged particles in interplanetary space that appear during quiet time periods, that is, not associated with solar activity events like intense flares or coronal mass ejections. The interaction of charged particles with modeled turbulent electromagnetic fields, which mimic the fields observed in the interplanetary medium, is studied. The turbulence is modeled by means of a dynamical system,the Gledzer-Ohkitani-Yamada (GOY) shell model, which describes the gross features of the Navier-Stokes equations. The GOY model is used to build a 3-D velocity field, which in turn is used to numerically solve the ideal magneto-hydrodynamic (MHD) induction equation, while the electric field is calculated from the ideal Ohm's law. Particle acceleration in such an environment is investigated by test particle simulations, and the resulting energy distributions are discussed and compared to observations of suprathermal electrons and ions during quiet periods in interplanetary space.
Isliker Heinz
Lepreti Fabio
Petraki Kalliopi
Vlahos Loukas
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