In-flight Performance and Initial Results of Plasma Energy Angle and Composition Experiment (PACE) on SELENE (Kaguya)
In-flight Performance and Initial Results of Plasma Energy Angle and Composition Experiment (PACE) on SELENE (Kaguya)
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DOI：
10.1007/s11214-010-9647-x
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发表时间：
2010-04
影响因子：
10.3
通讯作者：
Yoshifumi Saito;S. Yokota;K. Asamura;Takaaki Tanaka;M. Nishino;Tadateru I. Yamamoto;Yuta Terakawa;M. Fujimoto;H. Hasegawa;H. Hayakawa;M. Hirahara;M. Hoshino;S. Machida;T. Mukai;T. Nagai;T. Nagatsuma;T. Nakagawa;M. Nakamura;K. Oyama;E. Sagawa;S. Sasaki;K. Seki;I. Shinohara;T. Terasawa;H. Tsunakawa;H. Shibuya;M. Matsushima;H. Shimizu;F. Takahashi
中科院分区：
文献类型：
--
作者：
Yoshifumi Saito;S. Yokota;K. Asamura;Takaaki Tanaka;M. Nishino;Tadateru I. Yamamoto;Yuta Terakawa;M. Fujimoto;H. Hasegawa;H. Hayakawa;M. Hirahara;M. Hoshino;S. Machida;T. Mukai;T. Nagai;T. Nagatsuma;T. Nakagawa;M. Nakamura;K. Oyama;E. Sagawa;S. Sasaki;K. Seki;I. Shinohara;T. Terasawa;H. Tsunakawa;H. Shibuya;M. Matsushima;H. Shimizu;F. Takahashi
SELENE(卡古亚)上的MAP-PACE(磁场和等离子体实验--等离子体能量角度和组成实验)已经完成了对月球周围低能带电粒子的∼为期1年半的观测。MAP-PACE由4个传感器组成：ESA(电子光谱分析仪)-S1、ESA-S2(离子质量分析仪)、IMA(离子质量分析仪)和IEA(离子能量分析仪)。ESA-S1和S2分别在6 eV-9 keV和9 eV-16 keV能量范围内测量了低能电子的分布函数。IMA和IEA测量了低能离子在7 eV/q-28 keV/q和7 eV/q-29 keV/q能量范围内的分布函数。所有传感器在发射前的实验室实验中都表现得很好。由于每个传感器都有一个半球视场，因此在航天器面板上相对安装的两个电子传感器和两个离子传感器可以覆盖整个低能电子和离子的三维相空间。其中一种离子传感器IMA是一种能量质谱仪。IMA测量了以前从未在绕月100公里高度的极地轨道上获得的质量比离子能谱。最新的观测数据显示了月球周围特有的离子群。除了太阳风，MAP-PACE-IMA还在月球的日侧发现了四种明显可区分的离子群：(1)在月球表面反向散射的太阳风质子，(2)由月球表面磁异常反射的太阳风质子，(3)由太阳风吸收的反射/反向散射质子，以及(4)来自月球表面/月球外圈的离子。
MAP-PACE (MAgnetic field and Plasma experiment—Plasma energy Angle and Composition Experiment) on SELENE (Kaguya) has completed its ∼1.5-year observation of low-energy charged particles around the Moon. MAP-PACE consists of 4 sensors: ESA (Electron Spectrum Analyzer)-S1, ESA-S2, IMA (Ion Mass Analyzer), and IEA (Ion Energy Analyzer). ESA-S1 and S2 measured the distribution function of low-energy electrons in the energy range 6 eV–9 keV and 9 eV–16 keV, respectively. IMA and IEA measured the distribution function of low-energy ions in the energy ranges 7 eV/q–28 keV/q and 7 eV/q–29 keV/q. All the sensors performed quite well as expected from the laboratory experiment carried out before launch. Since each sensor has a hemispherical field of view, two electron sensors and two ion sensors installed on the spacecraft panels opposite each other could cover the full 3-dimensional phase space of low-energy electrons and ions. One of the ion sensors IMA is an energy mass spectrometer. IMA measured mass-specific ion energy spectra that have never before been obtained at a 100 km altitude polar orbit around the Moon. The newly observed data show characteristic ion populations around the Moon. Besides the solar wind, MAP-PACE-IMA found four clearly distinguishable ion populations on the dayside of the Moon: (1) Solar wind protons backscattered at the lunar surface, (2) Solar wind protons reflected by magnetic anomalies on the lunar surface, (3) Reflected/backscattered protons picked-up by the solar wind, and (4) Ions originating from the lunar surface/lunar exosphere.