Abstract
There are now clear observations of large parallel electric fields (E∥) from Polar and FAST in the auroral upward‐current region (UCR). Such fields in some events are associated with large perpendicular electric fields (E⊥) and density cavities while in others they could occur without them. The observed features of the fields and density are found to be compatible with the spatial structures seen in a simulated U‐shaped potential structure (PS) using a 2.5D electrostatic code. The spatial and temporal evolution of the U‐shaped PS (USPS) including its upward and downward motions and its striations into thin long potential structures suggest a variety of signatures in the satellite detection of E∥ and E⊥.
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