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While it is well known that space environment can produce spacecraft anomaly, defining\udspace environment effects for each anomalies is difficult. This is caused by the fact\udthat spacecraft anomaly shows various symptoms and reproducing it is impossible. In\udthis study, we try to find the conditions of when spacecraft failures happen more frequently\udand give satellite operators useful information. Especially, our study focuses\udon the geosynchronous satellites which cost is high and required high reliability. We\udused satellite anomaly data given by Satellite News Digest which is internet newspaper\udproviding space industry news. In our analysis, 88 anomaly cases occurred from\ud1997 to 2008 shows bad corelation with Kp index. Satellite malfunctions were likely\udto happen in spring and fall and in local time from midnight to dawn. In addition,\udwe found the probability of anomaly increase when high energy electron flux is high.\udThis is more clearly appeared in solar minimum than maximum perio

Analysis on Space Environment from the Anomalies of Geosynchronous Satellites