TY - JOUR
T1 - In-flight performance and initial results of plasma energy angle and composition experiment (PACE) on SELENE (Kaguya)
AU - Saito, Yoshifumi
AU - Yokota, Shoichiro
AU - Asamura, Kazushi
AU - Tanaka, Takaaki
AU - Nishino, Masaki N.
AU - Yamamoto, Tadateru
AU - Terakawa, Yuta
AU - Fujimoto, Masaki
AU - Hasegawa, Hiroshi
AU - Hayakawa, Hajime
AU - Hirahara, Masafumi
AU - Hoshino, Masahiro
AU - MacHida, Shinobu
AU - Mukai, Toshifumi
AU - Nagai, Tsugunobu
AU - Nagatsuma, Tsutomu
AU - Nakagawa, Tomoko
AU - Nakamura, Masato
AU - Oyama, Koh Ichiro
AU - Sagawa, Eiichi
AU - Sasaki, Susumu
AU - Seki, Kanako
AU - Shinohara, Iku
AU - Terasawa, Toshio
AU - Tsunakawa, Hideo
AU - Shibuya, Hidetoshi
AU - Matsushima, Masaki
AU - Shimizu, Hisayoshi
AU - Takahashi, Futoshi
PY - 2010/7
Y1 - 2010/7
N2 - 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.
AB - 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.
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U2 - 10.1007/s11214-010-9647-x
DO - 10.1007/s11214-010-9647-x
M3 - Article
AN - SCOPUS:78650171495
VL - 154
SP - 265
EP - 303
JO - Space Science Reviews
JF - Space Science Reviews
SN - 0038-6308
IS - 1-4
ER -