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Comparison of High Energy Particles Observation Results Between FY-3A Satellite and NOAA Series Satellites

Wang Chunqin; Zhang Xianguo; Wang Shijin; Wang Yue; Liu Chao; Jing Tao   

  • Received:1900-01-01 Revised:1900-01-01 Online:2010-01-15 Published:2010-01-15

Abstract: FY-3A satellite was launched in June 2008 into solar synchronization orbit (about 800 km altitude). There are detectors that can measure 3~300 MeV high energy proton and 0.15~5.70 MeV high energy electrons on FY-3A satellite to carry out long-time space particles environment measurement. During the period from 2008 to 2009, space environment is very quiet because of low solar activities. The detection results on FY-3A satellite shows that flux of 3$\sim$300\,MeV high energy protons mainly are confined to SAA, whereas flux of electrons are located in SAA and around the north and south poles. The result also shows that the flux of energetic particles is to be highly anisotropic. By combining the detection result from FY-3A satellite with that from NOAA satellites, we can also find there exit differences between the detecting data from the two series of satellites not only in the space distribution of particles but also in the intensity of particles. These show the flux of energetic particles is to be highly anisotropic influenced by different pitch angles. Considering the difference of the particles flux and distribution induced by limits of time and space, even and the different designs between the detectors on the two satellites, we compared the protons and electrons detection results from FY-3A with those from NOAA satellites. A generally good agreement is observed in the flux values and distribution trend of protons and electrons. All the above indicates the detectors on FY-3A satellite have the ability to measure space energy particles. The detection results are now available, so that we can use the data from FY-3A satellite to further study radiation belt particles distribution, origin and transmission.