EXOS‐D observations of upflowing ion conics with high time resolution
EXOS‐D observations of upflowing ion conics with high time resolution
复制标题
高时间分辨率的上流离子圆锥曲线的 EXOS-D 观测
DOI：
10.1029/91gl00037
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发表时间：
1991
影响因子：
5.2
通讯作者：
H. Fukunishi
中科院分区：
文献类型：
--
作者：
W. Miyake;T. Mukai;N. Kaya;H. Fukunishi
从Exos-D带电粒子观测报告了能量高达100 eV的上升离子二次曲线及其对快速变化的电子沉淀的响应。上升流离子的场向体位移与电子沉降有很好的相关性，即使在很小的尺度上，表明体位移是由卫星周围平行电场的加速引起的。另一方面，上升流离子的各向异性（垂直加热）以迟钝的方式响应于电子沉淀。只有在大的或长寿命的电子沉淀区，各向异性降低，离子在相空间中的分布接近离子束。在离子束的相空间分布中仍然发现了低高度加热的特征。观察表明，高架（双峰）二次曲线和向上的光束之间的密切联系。
Upflowing ion conics with energies of up to 100 eV and its response to quickly varying electron precipitation are reported from Exos-D charged particle observation. The field aligned bulk shift of upflowing ions is well correlated to electron precipitation even with a small scale, indicating the bulk shift is caused by the acceleration of parallel electric field around the satellite. On the other hand, the anisotropy (perpendicular heating) of upflowing ions responds to the electron precipitation in a dull way. Only in the large or long-lived region of electron precipitation, the anisotropy is reduced and the ion distribution in phase space approaches the ion beam. Signature of heating at lower altitude is still found in the phase space distribution of the ion beams. The observation shows a close connection between the elevated (bimodal) conics and upward beams.