Multiple auroral brightenings and associated Pi 2 pulsations

All‐sky auroral data at Kotzebue (KOT, 64.4° MLAT), Alaska, and magnetic field data from both high‐ and low‐latitude stations are used to demonstrate the relation between multiple auroral brightenings and Pi 2 magnetic pulsations during an isolated substorm. At least five Pi 2 wave packets are identified in the magnetic field data around the end of the growth phase. Auroral luminosity variations do not show oscillations in the Pi 2 frequency range, though each Pi 2 wave packet has good correspondence with each small‐scale auroral brightening and poleward motion. This fact may contradict the idea of high‐latitude Pi 2 generation by oscillations of substorm field‐aligned currents. We discuss possible reasons of this discrepancy from localization of the Pi 2 current system and low‐energy electrons as the current carrier.