The LEP‐e instrument is an analyzer which enables the ERG satellite to observe the energy distribution and density of low energy electrons surrounding the Earth. It is the first time that a Taiwan‐made particle instrument is to cruise in the magnetosphere exploring the regions of intense ionizing radiation and monitoring the essential regions that affect our space weather. It has strengthened Taiwan’s capability in building advanced instruments for space science missions, increased world-class space research opportunities and paved the way for future international opportunities in space exploration mission.