Abstract
AbstractWhile it is well known that space environment can produce spacecraft anomaly, defin-ing space environment effects for each anomalies is difficult. This is caused by the factthat spacecraft anomaly shows various symptoms and reproducing it is impossible. Inthis study, we try to find the conditions of when spacecraft failures happen more fre-quently and give satellite operators useful information. Especially, our study focuseson the geosynchronous satellites which cost is high and required high reliability. Weused satellite anomaly data given by Satellite News Digest which is internet newspa-per providing space industry news. In our analysis, 88 anomaly cases occurred from1997 to 2008 shows bad corelation with Kp index. Satellite malfunctions were likelyto happen in spring and fall and in local time from midnight to dawn. In addition,we found the probability of anomaly increase when high energy electron flux is high.This is more clearly appeared in solar minimum than maximum period y corresponding author
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