Low-energy particle experiments–electron analyzer (LEPe) onboard the Arase spacecraft

Yoichi Kazama, Bo Jhou Wang, Shiang Yu Wang, Paul T.P. Ho, Sunny Wing-Yee Tam, Tzu Fang Chang, Chih Yu Chiang, Kazushi Asamura

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

In this report, we describe the low-energy electron instrument LEPe (low-energy particle experiments–electron analyzer) onboard the Arase (ERG) spacecraft. The instrument measures a three-dimensional distribution function of electrons with energies of ∼ 19 eV–19 keV. Electrons in this energy range dominate in the inner magnetosphere, and measurement of such electrons is important in terms of understanding the magnetospheric dynamics and wave–particle interaction. The instrument employs a toroidal tophat electrostatic energy analyzer with a passive 6-mm aluminum shield. To minimize background radiation effects, the analyzer has a background channel, which monitors counts produced by background radiation. Background counts are then subtracted from measured counts. Electronic components are radiation tolerant, and 5-mm-thick shielding of the electronics housing ensures that the total dose is less than 100 kRad for the one-year nominal mission lifetime. The first in-space measurement test was done on February 12, 2017, showing that the instrument functions well. On February 27, the first all-instrument run test was done, and the LEPe instrument measured an energy dispersion event probably related to a substorm injection occurring immediately before the instrument turn-on. These initial results indicate that the instrument works fine in space, and the measurement performance is good for science purposes.[Figure not available: see fulltext.].

Original languageEnglish
Article number165
JournalEarth, Planets and Space
Volume69
Issue number1
DOIs
Publication statusPublished - 2017 Dec 1

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particle energy
analyzers
spacecraft
energy
electron
background radiation
electrons
radiation effects
particle
magnetospheres
magnetosphere
shielding
monitors
shield
aluminum
distribution functions
electron energy
electrostatics
injection
life (durability)

All Science Journal Classification (ASJC) codes

  • Geology
  • Space and Planetary Science

Cite this

Kazama, Yoichi ; Wang, Bo Jhou ; Wang, Shiang Yu ; Ho, Paul T.P. ; Tam, Sunny Wing-Yee ; Chang, Tzu Fang ; Chiang, Chih Yu ; Asamura, Kazushi. / Low-energy particle experiments–electron analyzer (LEPe) onboard the Arase spacecraft. In: Earth, Planets and Space. 2017 ; Vol. 69, No. 1.
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Low-energy particle experiments–electron analyzer (LEPe) onboard the Arase spacecraft. / Kazama, Yoichi; Wang, Bo Jhou; Wang, Shiang Yu; Ho, Paul T.P.; Tam, Sunny Wing-Yee; Chang, Tzu Fang; Chiang, Chih Yu; Asamura, Kazushi.

In: Earth, Planets and Space, Vol. 69, No. 1, 165, 01.12.2017.

Research output: Contribution to journalArticle

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