The Imager for Sprites and Upper Atmospheric Lightning (ISUAL) was a cooperation between the Space Sciences Laboratory (SSL) of the University of California at Berkeley with the National Chen Kung University (NCKU). This cooperation was part of the FORMOSAT-2 project sponsored by the National Space Program Office of Taiwan (NSPO). It was the first specifically dedicated instrument to observe lightning-induced transient luminous events (TLE): sprites, elves, halos, and gigantic jets from space.
