Observations of the JUICE PEP JEI plasma spectrometer during the Moon and Earth flyby in August 2024

The plasma spectrometer JEI is an ion and electron spectrometer designed to observe the thermal and medium energy charged particle environement of Jupiter. It is part of the PEP instrument onboard JUICE. The flyby through the Earth-Moon system in August 2024 will be the first test of the instrument in a magnetospheric plasma and under higher radiation. We will report on the instrument performance and on observations of charged particles in the lunar environment and during the crossing of the Earth magnetosphere and radiation belts.