Detection of Cometary Pickup Ions up to 10(exp 7) KM from Comet Halley: Suisei Observation
Detection of Cometary Pickup Ions up to 10(exp 7) KM from Comet Halley: Suisei Observation
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探测距离哈雷彗星 10(exp 7) KM 的彗星拾取离子：Suisei 观测
DOI：
10.1029/gl013i008p00837
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发表时间：
1986
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通讯作者：
K. Hirao
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作者：
寺沢 敏夫;向井 利典;三宅 亘;北山 正信;平尾 邦雄;T. Terasawa;T. Mukai;W. Miyake;M. Kitayama;K. Hirao
在距彗核9.7 × 106 km处观测到彗星质子，而在距彗核4.0 × 106 km处观测到彗星水族离子（预计主要是O+）。对这些彗星离子的观测是基于对离子相空间分布中的一个特定特征（离子拾取壳层）的识别。我们发现皮卡外壳通常仅部分填充（约50%）。这一观察结果表明，能量扩散的效率与俯仰角扩散的效率相当。从观测到的彗星离子密度在航天器轨道的入站和出站部分之间的空间不对称性可以看出，在入站和出站轨道周围的离子产生率之间存在2-3倍的差异。
Cometary pickup protons were observed as far as 9.7 × 106 km away from the cometary nucleus, while the pickup cometary ions of water-group (expected to be mainly O+) were observed as far as 4.0 × 106 km. Observation of these cometary ions is based on the identification of a specific feature in the phase space distribution of ions (ion-pickup shell). We found that the pickup shell is usually filled only partially (∼50%). This observation suggests that the efficiency of the energy diffusion is comparable to that of the pitch angle diffusion. From the spatial asymmetry in the cometary ion density observed between inbound and outbound parts of the spacecraft orbit, it is suggested that there was a difference of a factor of 2-3 between the ion production rates around the inbound and outbound orbit.
制药杂志106-4。
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