BepiColombo Mio (previously called MMO: Mercury Magnetospheric Orbiter) was successfully launched by Ariane 5 from Kourou, French Guiana on October 20, 2018. The Mercury Plasma/Particle Experiment (MPPE) is a comprehensive instrument package onboard Mio spacecraft used for plasma, high-energy particle and energetic neutral atom measurements. It consists of seven sensors including two Mercury Electron Analyzers (MEA1 and MEA2), Mercury Ion Analyzer (MIA), Mass Spectrum Analyzer (MSA), High Energy Particle instrument for electron (HEP-ele), High Energy Particle instrument for ion (HEP-ion), and Energetic Neutrals Analyzer (ENA). Significant efforts were made pre-flight to calibrate all of the MPPE sensors at the appropriate facilities on the ground. High voltage commissioning of MPPE analyzers was successfully performed between June and August 2019 and in February 2020 following the completion of the low voltage commissioning in November 2018. Although all of the MPPE analyzers are now ready to begin observation, the full service performance has been delayed until Mio’s arrival at Mercury. Most of the fields of view (FOVs) of the MPPE analyzers are blocked by the thermal shield surrounding the Mio spacecraft during the cruising phase. Together with other instruments on Mio including Magnetic Field Investigation (MGF) and Plasma Wave Investigation (PWI) that measure plasma field parameters, MPPE will contribute to the comprehensive understanding of the plasma environment around Mercury when BepiColombo/Mio begins observation after arriving at the planet Mercury in December 2025.

BepiColombo Mio（以前称为 MMO：水星磁层轨道器）由阿丽亚娜 5 号于 2018 年 10 月 20 日从法属圭亚那库鲁成功发射。 - 能量粒子和高能中性原子测量。它由七个传感器组成，包括两个汞电子分析仪（MEA1 和 MEA2）、汞离子分析仪（MIA）、质谱分析仪（MSA）、电子高能粒子仪（HEP-ele）、离子高能粒子仪（HEP） -ion) 和高能中性分析仪 (ENA)。飞行前做出了重大努力，以校准地面适当设施中的所有 MPPE 传感器。继2018年11月低压调试完成后，2019年6月至8月和2020年2月，MPPE分析仪高压调试成功。 尽管所有MPPE分析仪现已准备好开始观察，但全面服务性能被推迟直到澪到达水星。在巡航阶段，MPPE 分析仪的大部分视场 (FOV) 被 Mio 航天器周围的隔热罩阻挡。与 Mio 上的其他仪器，包括测量等离子体场参数的磁场调查 (MGF) 和等离子体波调查 (PWI) 一起，当 BepiColombo/Mio 到达地球后开始观测时，MPPE 将有助于全面了解水星周围的等离子体环境2025 年 12 月的水星。