Re‐ordered electron data in the low‐latitude boundary layer
Re‐ordered electron data in the low‐latitude boundary layer
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DOI：
10.1029/gl017i011p02043
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发表时间：
1990-10
影响因子：
5.2
通讯作者：
M. Hapgood;D. A. Bryant
中科院分区：
文献类型：
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作者：
M. Hapgood;D. A. Bryant
我们对 AMPTE-UKS 航天器穿越低纬度边界层时记录的所有电子数据进行了全面调查。在这 31 种情况中的 27 种中，电子在穿过边界层的跃迁过程中的密度和平均能量之间存在明显的反相关性。对这种反相关性的最简单解释是，在大多数情况下，边界太阳和地球等离子体之间的等离子体状态存在平滑变化，而时间序列数据中常见的突变是由边界层运动引起的。我们的数据表明，反相关总是有两个不同的部分。我们认为它们代表边界层内两个物理上不同的区域，并表明电子密度和能量在它们之间可能如何变化。我们简要讨论另一种解释，其中磁鞘等离子体的细丝穿透边界层。我们表明我们的结果对这样的模型提供了约束。
We have made a complete survey of all electron data recorded during low-latitude boundary layer crossings of the AMPTE-UKS spacecraft. In 27 of the 31 cases there is a clear anticorrelation between the density and the mean energy of the electrons during the transition across the boundary layer. The simplest interpretation of this anticorrelation is that, in the majority of cases, there is a smooth change of plasma state between the bounding solar and terrestrial plasmas, and that the abrupt changes frequently seen in time series data arise from boundary layer motions. Our data indicate that there are always two distinct sections to the anticorrelation. We suggest that these represent two physically distinct regions within the boundary layer and indicate how electron density and energy might vary across them. We briefly discuss an alternative interpretation in which filaments of magnetosheath plasma penetrate the boundary layer. We show that our results provide a constraint on such a model.