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<p>The Light Ion Analyzer (LIA) instrument, part of the Solar-wind-Magnetosphere–Ionosphere-link- Explorer (SMILE) mission, is designed to measure the ion velocity distribution function within an energy range of 5&#xa0;eV up to 25&#xa0;keV. LIA provides in-situ measurements of the ion velocity distribution functions of the solar wind and magnetosheath, from which the moments can be derived on the ground, serving as an upstream input for the magnetosphere-ionosphere downstream responses. Two identical 2<InlineEquation ID="IEq1"> <EquationSource Format="MATHML"><math> <mi>π</mi> </math></EquationSource> <EquationSource Format="TEX">$\pi $</EquationSource> </InlineEquation> sr field-of-view LIA instruments are mounted on two opposite sides of the spacecraft platform, offering a combined 4<InlineEquation ID="IEq2"> <EquationSource Format="MATHML"><math> <mi>π</mi> </math></EquationSource> <EquationSource Format="TEX">$\pi $</EquationSource> </InlineEquation> sr instantaneous field-of-view. Each LIA consists of a top-hat electrostatic analyzer, electrostatic aperture deflectors, and a microchannel plate detector for analyzing the energy, direction, and flux of ions. Depending on the operation mode, the angular resolution ranges from 5.625° to 22.5° in elevation and from 7.5° to 30° in azimuth, and the time resolution spans from 0.25 to 2 seconds. This paper describes the design of the LIA, its performance, ground calibration, operation procedures, and resultant data products.</p>

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The Light Ion Analyzer (LIA) for the SMILE Mission

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Lei Dai,
  • Linggao Kong,
  • Aibing Zhang,
  • Dhirendra Kataria,
  • Matthieu Berthomier,
  • Jun Gao,
  • Bin Su,
  • C. Philippe Escoubet,
  • Chi Wang,
  • Lei Li,
  • Yong Ren,
  • Wenjing Wang,
  • Yulong Lv,
  • Jianjing Ding,
  • Georgios Nicolaou,
  • Peter Wurz,
  • Walfried Raab,
  • Sylvain Vey,
  • Marius Echim

摘要

The Light Ion Analyzer (LIA) instrument, part of the Solar-wind-Magnetosphere–Ionosphere-link- Explorer (SMILE) mission, is designed to measure the ion velocity distribution function within an energy range of 5 eV up to 25 keV. LIA provides in-situ measurements of the ion velocity distribution functions of the solar wind and magnetosheath, from which the moments can be derived on the ground, serving as an upstream input for the magnetosphere-ionosphere downstream responses. Two identical 2 π $\pi $ sr field-of-view LIA instruments are mounted on two opposite sides of the spacecraft platform, offering a combined 4 π $\pi $ sr instantaneous field-of-view. Each LIA consists of a top-hat electrostatic analyzer, electrostatic aperture deflectors, and a microchannel plate detector for analyzing the energy, direction, and flux of ions. Depending on the operation mode, the angular resolution ranges from 5.625° to 22.5° in elevation and from 7.5° to 30° in azimuth, and the time resolution spans from 0.25 to 2 seconds. This paper describes the design of the LIA, its performance, ground calibration, operation procedures, and resultant data products.