‘Torus’ distribution of interstellar helium pickup ions: Direct observation
‘Torus’ distribution of interstellar helium pickup ions: Direct observation
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DOI：
10.1029/2002gl015111
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发表时间：
2002-05
影响因子：
5.2
通讯作者：
M. Oka;T. Terasawa;H. Noda;Y. Saito;T. Mukai
中科院分区：
文献类型：
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作者：
M. Oka;T. Terasawa;H. Noda;Y. Saito;T. Mukai
GEOTAIL在行星际空间探测到氦离子的“环面”状速度分布。统计调查表明，“环面”分布的观测概率接近20%，其分布模式与局地磁场方向和湍流程度有关。这些结果支持了最近发现的低俯仰角散射率和大平均自由程。
A‘torus’‐like velocity distribution of the helium pickup ions has been detected in interplanetary space by GEOTAIL. A statistical survey shows that the observation probability of the ‘torus’ distribution amounts to nearly 20% and that the distribution pattern depends on the local magnetic field directions and turbulence levels. These results support the recent finding of a low pitch angle scattering rate and a large mean free path.