Upward lightning (UL) is characterized by an upward leader initiated from a skyscraper or a high construction and extended its channel into the thundercloud. With the development of global urbanization and the utilization of clean energy, the rise of city skyscrapers, communication towers, and wind turbines has induced more natural UL. This kind of unusual lightning discharge provides a valuable opportunity to investigate detailed lightning processes and critical discharge parameters using prepared observation equipment, for example, high-speed photography, lightning current measurement, and close electromagnetic field detection. Researchers from different countries have conducted experiments on tower-initiated UL, which have advanced our understanding of lightning physics and its effects (