Abstract
Low-energy ion experiments–ion mass analyzer (LEPi) is one of the particle instruments onboard the ERG satellite. LEPi is an ion energy-mass spectrometer which covers the range of particle energies from < 0.01 to 25 keV/q. Species of incoming ions are discriminated by a combination of electrostatic energy-per-charge analysis and the time-of-flight technique. The sensor has a planar field-of-view, which provides 4pi steradian coverage by using the spin motion of the satellite. LEPi started its nominal observation after the initial checkout and commissioning phase in space.
Highlights
The Exploration of energization and Radiation in Geospace (ERG) mission is designed to explore the plasma structure and the dynamics of the terrestrial inner magnetosphere
The energy range of ion measurements on ERG is extended by the other ion analyzer, the medium-energy particle experiments–ion mass analyzer (MEPi) (Yokota et al 2017), up to 180 keV/q
We describe the performance of Low-energy ion experiments–ion mass analyzer (LEPi) and the initial observation results in this report
Summary
The Exploration of energization and Radiation in Geospace (ERG) mission is designed to explore the plasma structure and the dynamics of the terrestrial inner magnetosphere. LEPi is designed to measure the three-dimensional velocity distribution functions of ions over an energy range of < 0.01–25 keV/q with species discrimination.
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