Event Analysis of the Influence of Strong Tropospheric Convection in Summer on Low-latitude Ionospheric Irregularities in East Asia

Using various ground-based and space-based observation methods from the Hainan station and Southeast Asia, the spatiotemporal changes and physical processes of the irregularity events in the low-latitude F region of East Asia observed on the night of July 28, 2014 were analyzed. The main results are as follows. The Hainan station observed a rare occurrence of long-lasting ionospheric irregularities in the F region, and the ionospheric irregularities observed by different means have obvious morphological differences. There are obvious differences in the activities of ionospheric irregularities observed by different stations. The TEC fluctuation activities near the north-south anomalous peaks in the longitude area of Hainan increased significantly before midnight and weakened significantly after midnight. After midnight, the trajectory of the C/NOFS satellite gradually approached magnetic equator and was at a lower altitude. The occurrence of weak plasma disturbances/bubbles was almost always observed, which is obviously related to the activities of weak ionospheric irregularities observed on the ground in this region. The SWARM satellites still observed the strong two peaks of equatorial anomaly near dawn in the longitude region near Hainan station, and there were still the plasma density depletion/bubble structures near the anomalous peak area on the west side. The seed disturbance (gravity waves) excited by the MCC near the magnetic equator on the west side of the Hainan station (Indochina Peninsula) may play an important role in the generation of plasma bubbles and their quasi periodic structures in the low latitude region of East Asia.