Observation of a Long‐Lived Optical Meteor Producing Low Mesosphere Irregularity Echo: Trajectory, Fragmentation, and Spectroscopy. - Li, Yi; Li, Guozhu; Wu, Zhi; Hu, Lianhuan; Zhao, Xiukuan; Sun, Wenjie; Xie, Haiyong; Dai, Guofeng; Liu, Jianfei; Ning, Baiqi (Journal of Geophysical Research. Planets, 2025)