Energetic Electron Dynamic in the Inner Radiation Belt and SAA Region

 Energetic Electron Dynamics are ones of the most dynamic processes in Earth's magnetosphere and have global consequences and broad implications for space weather. They can be monitored using energetic electron detectors on both Macao Science Satellites (MSS-1A/B) and sunsynchronous satellites (Fengyun 3E). There are triple Imaging Electron Spectrometer (IES)  instruments to be installed in the Macao Science Satellites and Chinese Sun-synchronous (FY3E) satellites, respectively. The IES instrument on board  both Macao Science Satellites and Chinese Meteorology FY-3 (sunsynchronous) satellite, launched on May, 2023, and 4 July, 2021 (FY-3)  into a sunsynchronous satellite orbit (LEO), provides the first  constellation eneregetic electron measurements in the inner Radiation Belt and SAA region. The Macau Scientific Satellite - 1 (MSS) comprises two satellites orbiting the Earth at an inclination of 41. MSS1-A follows a circular orbit at an altitude of 450 km, while MSS1-B's orbit is elliptical, ranging between 450 and 500 km in altitude, with its apogee positioned near the South Atlantic Anomaly (SAA). These two satellites share a similar orbit, maintaining a separation of approximately 5-10s minutes, which has varied since their launch. The orbital period for both satellites is approximately 94 minutes.  The innermost and outermost signatures of substorm injection have been observed by the IES instruments with a wide L shell spatial coverage, from L=1 ~ 6.  Such a configuration will provide a unique opportunity to investigate Energetic Electron Dynamics simultaneously at low and high  L shells. It will further elucidate potential mechanisms for the particle energization and transport, two of the most important topics in inner radiation belt dynamics.