Abstract:

Based on the data from the FY and GOES satellites, 44 anomalies of one Chinese geosynchronous satellite related to space environment that occurred from 2010 to 2015 are studied, mainly focusing on the time profiles of the anomalies, the accompanying environment phenomena and the characteristics of the space particle environment during the anomalies. Furthermore, the maximum electric field amplitude inside the dialectic using DICTAT model is calculated. The results show that: (1) The internal charge might be the reason of the anomalies on March 17. (2) Most anomalies accrue at day time (up to 79.5% of the total anomalies). This is consistent with the local time distribution of the flux of the energetic electrons (>2MeV). (3) 25 of the 44 anomalies (57%) are accompanied by the energetic electron storm. The 50% quartile of the energetic electron (>2MeV) flux begins to increase significantly 3-4 days before the anomaly, and the hazard quotient of the internal charging Z  IC becomes yellow two days before the anomaly. The 75% quartile of the energetic electron (>2MeV) flux begins to increase significantly 4 days before the anomaly, and the hazard quotient of the internal charging Z  IC becomes red twice two days before the anomaly. (4) In categories II, III, and IV, the maximum electric field inside the dietetic simulated from DICTAT reaches and maintains larger than 10 6V.m -1 after 19.2, 50.4 and 9.8 hours, which has the potential hazard of the internal discharging. The internal charging caused by the energetic electrons could be the main reason of the 44 anomalies.

Key words: Satellite anomalies, Internal charging, Radiation dose, Single particle effect, Hazard quotient, DICTAT simulation, Maximum electric field