Using the ground-based multi instruments observations in Hainan and Southeast Asia, as well as space-based observations, the long lasting events of ionospheric irregularities occurred in the equatorial region of East Asia on the night of March 31, 2014 are studied. Concurrent observations at Hainan station indicate that ionospheric irregularities measured with different instruments showed distinct spatial structures and temporal variation, mainly from sunset to midnight (19-23LT) and even to post midnight. The 3-m-scale irregularities detected by VHF radar first attenuated and disappeared at 01LT, then the 400-meter-scale irregularities (GPS scintillations) vanished at 03LT, and finally the larger-scale irregularities (spread F) ended at 05LT. It provides a directly observational evidence that the larger the scale is, the latter the irregularities decay after midnight. Ionospheric irregularities near the magnetic equator (ME) and the equatorial abnormal peaks (EAPs) mainly occurred from after sunset to midnight (19-01LT), but there were distinct morphological differences after midnight. The irregularities near ME were attenuated and disappeared rapidly, while irregularities near EAPs weakened obviously, but lasted until dawn. The plasma depletions observed by the SWARM satellite in the latter half of the night were clearly related to the TEC fluctuations at JOG2 site, the ionospheric scintillations and spread F at Hainan station. The quasiperiodic structures of plasma bubbles observed by C/NOFS satellite were clearly related to the occurrence of ionospheric irregularities in Hainan and Southeast Asia, which indicated that the seeding of atmospheric gravity waves may play an important role in the generation of ESF/EPB irregularities, even in the latter half of the night.

利用海南和东南亚的地基多仪器观测和天基观测，研究了2014年3月31日晚东亚赤道地区电离层不规则长期持续事件。海南站同期观测表明，不同仪器测量的电离层不规则性表现出明显的空间结构和时间变化，主要是从日落到午夜（19-23LT），甚至到午夜之后。甚高频雷达探测到的 3 米尺度的不规则性首先在 01LT 衰减并消失，然后 400 米尺度的不规则性（GPS 闪烁）在 03LT 消失，最后更大规模的不规则性（扩展 F）在 05LT 结束。它提供了一个直接的观察证据，表明尺度越大，后者的不规则性在午夜后衰减。磁赤道（ME）附近的电离层不规则性和赤道异常峰（EAPs）主要发生在日落后至午夜（19-01LT），但午夜后有明显的形态差异。ME附近的不规则性减弱并迅速消失，而EAP附近的不规则性明显减弱，但一直持续到黎明。SWARM卫星在后半夜观测到的等离子体损耗明显与JOG2站TEC波动、海南站电离层闪烁和扩散F有关。C/NOFS卫星观测到的等离子体气泡准周期结构与海南和东南亚电离层不规则的发生明显相关，