D. Li, A. Luque, F. J. Gordillo-Vazquez, F. Liu, G. Lu, T. Neubert, O. Chanrion, B. Zhu, N. Østgaard and Reglero V. Reglero, Blue Flashes as Counterparts to Narrow Bipolar Events: the Optical Signal of Shallow In-Cloud Discharges, AGU Fall Meeting, New Orleans, US, Dec. 13-17, 2021