Abstract
Macao Science Satellite-1(MSS-1)is a two-star constellation mission sponsored jointly by the China National Space Ad-ministration(CNSA)and the Macau University of Science and Technology(MUST).The mission aims to explore the geo-magnetic field and space particle radiation environment in low-inclination low Earth orbit.The satellite A of MSS-1(MSS-1 A)carries the third-generation high-energy electron spectrometer(HES),developed by Peking University,to detect high-energy electrons.The HES sensor head utilizes a conventional AE-E silicon detector telescope,enabling measurements of high-energy electrons within a 45°cone angle field of view,ranging from 0.3 to 3.0 MeV.As a new generation of high-energy electron detectors(HEDs),the HES operates by default in the in-orbit multi-channel mode,allowing 128 segmented linear distributed energy bin counting measurements with a time resolution of 1 s.High energy resolution observations of high-energy electrons in the inner radiation belt by the HES onboard MSS-1 A can help investigate the following questions:Do MeV electrons exist in the inner radiation belt?What is the production mechanism of relativistic electrons in the inner radiation belt?
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