Abstract
AbstractThe space particle detector onboard the FengYun2D (FY2D) satellite has the capabilities to observe 10~300 MeV protons and ≥350 keV, ≥2 MeV electrons. During the first in‐flight test phase, at the geosynchronous orbit, energetic electrons showed the typical characteristics of noon‐midnight asymmetries and a level‐2 solar energetic proton event (SEP) was observed on Dec.15. After the peak of the SEP, the flux of protons with comparatively higher energy decreased more quickly. By comparing the results of FY2D and GOES at different local times at the geosynchronous orbit, energetic electrons showed the properties of synchronous disturbance and intense dawn‐dusk asymmetry. We have analyzed the space particles environment at geosynchronous orbit during the SEP and the quiet time and the correlation of contemporaneous results of FY2D with GOES. The result indicates that the instrument has the capabilities of inspecting and warning. And the results can be used to investigate the particle distributions at geosynchronous orbit or to research the particles transport and origin.
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