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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.