Multi‐spacecraft observations of diffuse ions upstream of Earth's bow shock
Multi‐spacecraft observations of diffuse ions upstream of Earth's bow shock
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多航天器对地球弓激波上游扩散离子的观测
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
Harald Kucharek
中科院分区：
文献类型：
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作者：
A. Kis;M. Scholer;B. Klecker;E. Möbius;E. Lucek;H. Rème;J. Bosqued;L. Kistler;Harald Kucharek
我们报告了在10小时的时间内，当航天器间的分离距离在101和101.5 Re之间时，通过Cluster对地球准平行弓形激波上游的高能离子的同时测量。使用弓形激波模型，我们确定了每32秒的平均数据集的距离集群1和集群3航天器从弓形激波沿着磁场。利用在两个航天器上观测到的部分高能离子密度的差异，我们确定了在10至32 keV的4个能量通道中距弓激波不同距离处的部分密度的空间梯度。所有四个能量通道中的梯度随距离呈指数下降。梯度的e-折叠距离近似线性地依赖于能量，并且从11 keV时的0.5 Re增加到127 keV时的2.8 Re。这些数值大约是Ipavich等人[1981]和Trattner等人[1994]在统计基础上获得的数值的一半。
We report on simultaneous measurements of energetic ions upstream of Earth's quasi‐parallel bow shock by Cluster during a 10 hour time period when the inter‐spacecraft separation distance was between ∼1 and ∼1.5 Re. Using a bow shock model we determined for each 32 s averaged data set the distance of the Cluster 1 and Cluster 3 spacecraft from the bow shock along the magnetic field. Using the differences of the partial energetic ion densities observed on the two spacecraft we determined the spatial gradient of partial densities at various distances from the bow shock in 4 energy channels ranging from 10 to 32 keV. The gradients in all four energy channels decrease exponentially with distance. The e‐folding distance of the gradients depends approximately linearly on energy and increases from ∼0.5 Re at ∼11 keV to ∼2.8 Re at ∼27 keV. These values are about half of the values obtained on a statistical basis by Ipavich et al. [1981] and by Trattner et al. [1994] .