Quiet, discrete auroral arcs are an important and fundamental consequence of solar wind-
magnetosphere interaction. We summarize the current standing of observations of such …

Poleward‐moving auroral arcs (PMAAs) with recurrence periods on the order of minutes
have been established as a distinct form of auroral activities. Their origin and characteristics …

The substorm current wedge (SCW) is a fundamental component of geomagnetic substorms.
Models tend to describe the SCW as a simple line current flowing into the ionosphere toward …

We present initial statistical results of a new methodology for identifying electron
precipitation mechanisms in Earth's auroral zone. Unlike previous methodologies, it …

After 12 years of operations, the Cluster mission continues to successfully fulfil its scientific
objectives. The main goal of the Cluster mission, comprised of four identical spacecraft, is to …

Based on discussions held at a workshop in Bra-Pollenzo, Italy, this paper elaborates upon
19 outstanding questions of plasma physics in the Earth's magnetosphere. The questions …

High resolution imaging within regions of auroral luminosity reveal complex, highly
structured dynamic and often vortical forms which evolve on time scales of the order of …

The acceleration region above stable, discrete auroral arcs is reviewed. Substantial
observational evidence shows that the acceleration of auroral electrons associated with …

This publication addresses the collisional superthermal electron dynamics below the auroral
acceleration region (AAR). This region is the portion of an auroral field line with a field …

From multipoint, in situ observations and imaging, we reveal the injection‐powered, Alfvénic
nature of auroral acceleration during onset and expansion of a substorm. It is shown how …