Abstract
The formation and dynamic evolution of double layers which form inside the auroral cavity are studied using one‐ and two‐dimensional electrostatic particle‐in‐cell simulations. Both the one‐ and two‐dimensional simulations are confined to processes that occur in the auroral cavity and include four plasma populations: hot electrons, H+ and O+ anti‐earthward ion beams and a hot H+background population. We show that double layers inside the auroral cavity can evolve nonlinearly from ion phase space holes and are supported by the cold, anti‐earthward traveling O+beam. We then present two‐dimensional particle‐in‐cell results which show that double layers in the interior of the auroral cavity can form in higher dimensions. The electric field structure in 2‐D is verified as a double layer through simultaneous analysis of the parallel electric field and H+ and O+ phase space.
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