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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >A statistical study of the inner edge of the electron plasma sheet and the net convection potential as a function of geomagnetic activity
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A statistical study of the inner edge of the electron plasma sheet and the net convection potential as a function of geomagnetic activity

机译：电子等离子体片内边缘和净对流势与地磁活动关系的统计研究

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A widely accepted explanation of the location of the inner edge of the electron plasma sheet and its dependence on electron energy is based on drift motions of individual particles.The boundary is identified as the separatrix between drift trajectories linking the tail to the dayside magnetopause (open paths) and trajectories closed around the Earth. A statistical study of the inner edge of the electron plasma sheet using THEMIS Electrostatic Analyzer plasma data from November 2007 to April 2009 enabled us to examine this model. Using a dipole magnetic field and a Volland-Stern electric field with shielding, we find that a steady state drift boundary model represents the average location of the electron plasma sheet boundary and reflects its variation with the solar wind electric field in the local time region between 21:00 and 06:00, except at high activity levels. However, the model does not reproduce the observed energy dispersion of the boundaries. We have also used the location of the inner edge of the electron plasma sheet to parameterize the potential drop of the tail convection electric field as a function of solar wind electric field (E_(sw)) and geomagnetic activity. The range of E_(sw) examined is small because the data were acquired near solar minimum. For the range of values tested (meaningful statistics only for E_(sw) < 2 mV/m), reasonably good agreement is found between the potential drop of the tail convection electric field inferred from the location of the inner edge and the polar cap potential drop calculated from the model of Boyle et al. (1997).
机译：关于电子等离子体片内边缘的位置及其对电子能量的依赖性的广泛接受的解释是基于单个粒子的漂移运动，该边界被确定为将尾部连接到日间磁更年期的漂移轨迹之间的分离（开放路径）和轨迹在地球周围封闭。从2007年11月至2009年4月使用THEMIS静电分析仪等离子体数据对电子等离子体板的内边缘进行了统计研究，使我们能够检查此模型。使用偶极子磁场和带屏蔽的Volland-Stern电场，我们发现稳态漂移边界模型代表了电子等离子片边界的平均位置，并反映了其在当地时间范围内随太阳风电场的变化。 21:00和06:00，但活动水平较高时除外。但是，该模型没有重现观察到的边界能量分散。我们还使用了电子等离子片内边缘的位置来参数化尾部对流电场的电势降，它是太阳风电场（E_（sw））和地磁活动的函数。 E_（sw）的检查范围很小，因为数据是在接近太阳极小值的情况下获取的。对于测试值的范围（仅对于E_（sw）<2 mV / m才有意义的统计数据），从内边缘位置推断出的尾部对流电场的电势降与极帽电势之间找到了相当好的一致性根据Boyle等人的模型计算得出的下降。 （1997）。

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