Jörgen Vedin (Dept. of Physics, Umeå University)Date:
AniaraParticle-ﬂuid simulation of the auroral current
The incompatibility between stationary kinetic and dynamic ﬂuid descriptions of auroral electron acceleration has been an outstanding problem in space physics for decades. In this study we introduce a new numerical simulation model that provides a uniﬁed picture by including electron temperature variations consistent with collisionless kinetic theory in the ﬂuid description. We demonstrate that this new particle-ﬂuid model can describe the partial reﬂection of Alfven waves from the acceleration region, as well as the formation of a ﬁeld-aligned potential drop proportional to the upward current. The model also enables comparisons between the electron distributions predicted by the simulations and satellite observations of electrons in the acceleration region.
Created 2006-05-16 08:07:47 by Mats HolmströmLast changed 2006-08-17 09:51:52 by Mats Holmström