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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Global equatorial plasma bubble growth rates using ionosphere data assimilation
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Global equatorial plasma bubble growth rates using ionosphere data assimilation

机译：全球赤道等离子体泡沫的增长速度电离层数据同化

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摘要

Flux tube integrated Rayleigh-Taylor instability growth rates computed by using the results of ionosphere data assimilation are used for the first time to investigate global plasma bubble occurrence. The study is carried out by assimilating total electron content measurements using ground-based Global Positioning System (GPS) receivers into thermosphere ionosphere electrodynamic general circulation model, and the growth rates are calculated by using standalone model run without assimilation (control run) as well as using prior (or forecast) state output of the assimilation run. The growth rates are compared with the rate of change of total electron content index (ROTI), estimated from global network of GPS receivers, as well as all-sky airglow observations carried out over Taiwan on the nights of 16 and 17 March 2015. In contrast to the growth rates using the control run, results using data assimilation show remarkable agreement with the ROTI. Further, the all-sky images reveal intense plasma bubbles over Taiwan on the night of 16 March, when the corresponding assimilated growth rate is also pronounced. Similarly, the absence of plasma bubbles in the all-sky images on the night of 17 March (St. Patrick’s Day storm) is supported by smaller growth rates predicted by the assimilation model. Significant improvements in the calculated growth rates could be achieved because of the accurate updating of zonal electric field in the data assimilation forecast. The results suggest that realistic estimate or prediction of plasma bubble occurrence could be feasible by taking advantage of the data assimilation approach adopted in this work.
机译：通量管集成瑞利泰勒不稳定性增长率计算使用的结果用于电离层数据同化第一次调查全球等离子体泡沫发生。同化总电子含量测量使用地面全球定位系统(GPS)接收器到热大气层电离层电动环流模式,通过使用独立的增长率计算模型运行没有同化(运行控制)以及使用前(或预期)的输出状态的同化。与之相比的变化率电子内容索引(烤肉),估计全球网络的GPS接收器,以及次全天大气光进行观察台湾在2015年3月16日和17日的晚上。使用控制与经济增长率跑,结果使用数据同化与烤肉的协议。次全天图像显示强烈的等离子体泡沫台湾3月16日晚,当相应的吸收增长率也明显。泡沫全天图片17日晚3月(圣帕特里克节风暴)支持较小的经济增长率的预测同化模型。计算增长率可能会实现因为准确的更新区域电场数据同化的预测。结果表明,现实的估计或等离子体预测泡沫发生可行的利用数据同化方法采用这项工作。

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