On the terrestrial gamma‐ray flashes preceding narrow bipolar events

This work was supported by the National Key R&D Program of China (2017YFC1501501), National Natural Science Foundation of China (U1938115, 41805004, and 41875006), and the Chinese Meridian Project. The Insight-HXMT mission is a project funded by China National Space Administration (CNSA) and Chinese Academy of Sciences (CAS). The Fengyun-2G satellite images are provided by National Satellite Meteorological Center (NSMC) of China (www.nsmc.org.cn).