Solar Extreme Events of 2003:
Fundamental Science and Applied Aspects

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JAXA's efforts in assessing recent spacecraft anomalies
Goka T., Matsumoto H., Kiyokazu K.,

We are continuing our assessment of the effects of solar activity on two recent spacecraft anomalies. (1)The Advanced Earth Observing Satellite II (ADEOS-II), Midori-II in Japanese (a low-altitude polar sun-synchronous satellite with an altitude of 800 km), suffered a catastrophic power loss failure last October. Solar cell power output dropped from 6 kW to 1 kW in 3 minutes from 16:13 to 16:16 UT on October 24. Just before the anomaly occurred, the magnetopause was compressed to below geosynchronous orbit, according to energetic particle and magnetic field data from GOES-12. It appears that the event occurred as the magnetopause was recovering. I will discuss the interim results of the Midori-II catastrophic discharge anomaly investigation. (2)The GEO-orbiting Data Relay Test Satellite (DRTS), also known as Kodama in Japanese, entered safe mode, essentially shutting down all non-critical functions, on the morning of Oct. 29 (JST). 3-axis attitude control of Kodama was then recovered on Nov. 7, 21:19 JST. I will report what occurred on the satellite, and solar proton and ESD alarts using space weather.





Skobeltsyn Institute of Nuclear Physics, Moscow State University, 2004