The document summarizes a drift mirror instability event that occurred from September 9-12, 2014. It provides background on drift mirror instability, a magnetohydrodynamic instability that can occur in a plasma under certain conditions related to anisotropies in temperature between perpendicular and parallel particles. Specifically, the instability occurs when the perpendicular plasma pressure reaches a threshold, causing the magnetic field to be expelled to areas of lower pressure and converting perpendicular motion to parallel. Questions are also posed about what causes sharp particle depletions during such events and the relationship between particles and waves.