On the Generation of an Unseasonal EPB Over South East Asia
On the Generation of an Unseasonal EPB Over South East Asia
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DOI：
10.1029/2020ja028724
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发表时间：
2021-02
期刊：
影响因子：
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通讯作者：
J. Currie;B. Carter;J. Retterer;T. Dao;R. Pradipta;R. Caton;K. Groves;Y. Otsuka;T. Yokoyama;K. Hozumi;T. Le Truong;M. Terkildsen
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文献类型：
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作者：
J. Currie;B. Carter;J. Retterer;T. Dao;R. Pradipta;R. Caton;K. Groves;Y. Otsuka;T. Yokoyama;K. Hozumi;T. Le Truong;M. Terkildsen
2014年7月22日，在东南亚上空观测到了一个非季节性的赤道等离子体泡（EPB）事件，之前没有研究过。提供了对该事件的调查，2014年7月26日作为比较，非气泡日。7月22日的EPB事件发生在日落后的晚期，与一个小的向上等离子体漂移有关。对SCINDA S4数据使用新的过滤器突出显示了这一事件。电离层资料显示，零星的E是目前在增长期的EPB事件。利用热层-电离层电动力学（TEC）全球环流模型的模拟结果进行了数值试验，研究了偶发E对线性R-T增长率的直接影响。结果表明，位于正确纬度和当地时间的零星E可以增加线性增长率。使用来自泰国Patumwan的TEC数据研究接种条件。在这两天都观察到波浪状结构，7月22日的振幅比7月26日更大。最后，使用高分辨率模式PBMOD进行的模拟表明，对于类似于感兴趣的日子的上述条件的强迫，在存在大的种子扰动的情况下会形成EPB。因此，这是可能的，这种非季节性事件是由大的种子扰动TEC。
An unseasonal equatorial plasma bubble (EPB) event over South‐East Asia was observed on July 22, 2014 that has not been studied before. An investigation into this event is presented with the 26th July, 2014 as a comparison, non‐bubble day. The 22nd July EPB event occurred in the late post‐sunset sector and was associated with a small upward plasma drift. This event was highlighted using a new filter on the SCINDA S4 data. Ionosonde data show that sporadic E was present during the growth period for the EPB event. Modeling results from Thermosphere‐Ionosphere Electrodynamics (TEC) Global Circulation Model were used to conduct a numerical experiment investigating the direct effect of sporadic E on the linear R‐T growth rate. It was shown that sporadic E located in the correct latitude and local time can increase the linear growth rate. The seeding conditions were investigated using TEC data from Patumwan, Thailand. Wave‐like structures were observed for both days of interest, with larger amplitudes on 22nd July compared with the 26th July. Finally, simulations using the high‐resolution model PBMOD showed that for forcing from above conditions similar to the days of interest, EPBs would form in the presence of large seed perturbations. Therefore, it is likely that this unseasonal event was caused by large seed perturbations in TEC.