[P-EM10] Space Weather and Space Climate

[PEM10-19] Observational Results of Space Energetic Particles from the Fengyun-3E Polar Orbit Satellite

*chunqin wang¹ (1.National Space Science Center, Chinese Academy of Sciences)

Keywords:FY-3E satellite, earth radiation belt, proton, electron

The FY-3E satellite is a member of the Fengyun-3 polar-orbit meteorological satellite series and represents China's first dawn-dusk orbit meteorological satellite. Orbiting at an altitude of approximately 830 kilometers with an inclination angle of 98.75°, the satellite is equipped with a high-energy particle detector designed to monitor the charged particle radiation environment. This detector provides flux data for high-energy electrons ranging from 0.15 MeV to 5.7 MeV and protons ranging from 3 MeV to 300 MeV in three directions of the satellite body: the -Z upward direction, the -X flight reverse direction, and the +Y direction perpendicular to the orbital plane.We have analyzed the data of high-energy protons and electrons monitored by the detector from July 2021 to May 2024, revealing the spatial distribution and long-term evolution characteristics in these three directions. The findings are summarized as follows:1) energy-dependent distribution and structure: The lower the energy, the broader the distribution range and the more complex the structure. This is particularly evident for electrons, which exhibit multiple striped patterns at both high northern and southern latitudes.2)directional flux intensity variations: Among the three directions, the flux intensity of electrons is highest in the +Y direction and lowest in the -Z direction. The differences in proton flux intensity among the three directions are relatively minor. Electrons in the +Y direction are most significantly affected by environmental disturbances.3)impact of extreme geomagnetic storms: The intense geomagnetic storm in May 2024 had a significant impact on the spatial distribution and flux intensity of both electrons and protons. The data obtained from the FY-3E satellite not only support the assessment of the orbital environment but also serve as a valuable resource for the design of spacecraft radiation protection and the secure layout of satellite equipment. Additionally, these measurements contribute to a deeper understanding of the dynamic physical processes of charged particles in the radiation belts during disturbances, especially under the influence of extreme events.