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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Statistical storm time examination of MLT-dependent plasmapause location derived from IMAGE EUV
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Statistical storm time examination of MLT-dependent plasmapause location derived from IMAGE EUV

机译：统计风暴时间检查来自MLT-dependent等离子体层顶位置图像EUV

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摘要

The location of the outer edge of the plasmasphere (the plasmapause) as a function of geomagnetic storm time is identified and investigated statistically in regard to the solar wind driver. Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) extreme ultraviolet (EUV) data are used to create an automated method that locates and extracts the plasmapause. The plasmapause extraction technique searches a set range of possible plasmasphere densities for a maximum gradient. The magnetic local time (MLT)-dependent plasmapause results are compared to manual extraction results. The plasmapause results from 39 intense storms are examined along a normalized epoch storm timeline to determine the average plasmapause L shell as a function of MLT and storm time. The average extracted plasmapause L shell follows the expected storm time plasmapause behavior. The results show that during the main phase, the plasmapause moves earthward and a plasmaspheric drainage plume forms near dusk and across the dayside during strong convection. During the recovery phase, the plume rejoins the corotationally driven plasma while the average plasmapause location moves farther from the Earth. The results are also examined in terms of the solar wind driver. We find evidence that shows that the different categories of solar wind drivers result in different plasmaspheric configurations. During magnetic cloud-driven events the plasmaspheric drainage plume appears at the start of the main phase. During sheath-driven events the plume forms later but typically extends further in MLT.
机译：等离子体层的外边缘的位置(等离子体层顶)作为地磁的函数风暴识别和调查统计在太阳风的司机。成像仪Magnetopause-to-Aurora全球探索(图片)极端紫外线(EUV)数据被用来创建一个自动化的方法定位和提取等离子体层顶。等离子体层顶萃取技术搜索一组可能的等离子体层密度范围最大的梯度。(MLT)端依赖等离子体层顶的结果进行了比较手动提取结果。结果39强烈风暴一起检查归一化时代风暴时间表来确定平均等离子体层顶壳的函数MLT和风暴。等离子体层顶L壳之前预期的风暴时间等离子体层顶行为。在主要阶段,等离子体层顶动作向地球和plasmaspheric排水羽形式接近黄昏,整个期间的光面强烈的对流。羽重返corotationally驱动等离子体而平均等离子体层顶位置移动远离地球。研究太阳风的司机。找到证据证明显示不同类别的太阳风司机导致不同plasmaspheric配置。磁cloud-driven plasmaspheric事件排水羽出现在主要的开始阶段。形式,但通常在MLT进一步延伸。

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