Dynamic plasmapause modelbased on THEMIS measurements
Dynamic plasmapause modelbased on THEMIS measurements
复制标题
基于 THEMIS 测量的动态等离子体暂停模型
DOI：
10.1002/2015ja021801
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
X.LI
中科院分区：
文献类型：
--
作者：
Liu X.;W.L. Liu;J.B. Cao;H. S. Fu;J.Yu;X.LI
本文介绍了一个动态等离子体层顶定位模型，该模型是基于2009 - 2013年5年的亚暴事件和大尺度相互作用时间历史（THEMIS）测量数据建立的。总共确定了5878个等离子体层顶穿越事件，足以覆盖所有24个磁本地时间（MLT）扇区。基于这个等离子体顶穿越数据库，我们研究了等离子体顶位置与太阳风参数和地磁指数之间的相关性。最后，我们选择了五个输入参数来建立等离子体层顶位置模型，包括5分钟平均SYM-H，AL和Au指数以及小时平均AE和Kp指数。在两次磁暴期间，对等离子体层顶的演变进行了两次样本外比较，表明模型结果与观测结果之间具有良好的一致性。这种模式有两个主要优点。首先，该模型提供了等离子体层顶的位置在24 MLT部门，仍然提供了良好的一致性与观测。其次，该模型能够在短至5分钟的时间尺度上再现等离子体层顶的动态变化。
This paper presents a dynamic plasmapause location model established based on 5 years of Time History of Events and Macroscale Interactions during Substorms (THEMIS) measurements from 2009 to 2013. In total, 5878 plasmapause crossing events are identified, sufficiently covering all 24 magnetic local time (MLT) sectors. Based on this plasmapause crossing database, we investigate the correlations between plasmapause locations with solar wind parameters and geomagnetic indices. Input parameters for the best fits are obtained for different MLT sectors, and finally, we choose five input parameters to build a plasmapause location model, including 5 min‐averagedSYM‐H,AL, and AU indices as well as hourly‐averagedAEandKpindices. two out‐of‐sample comparisons on the evolution of the plasmapause is shown during two magnetic storms, demonstrating good agreement between model results and observations. Two major advantages are achieved by this model. First, this model provides plasmapause locations at 24 MLT sectors, still providing good consistency with observations. Second, this model is able to reproduce dynamic variations of the plasmapause on timescales as short as 5 min.