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"It is the largest solar flare this year," said Suo Yucheng, a noted researcher with the China Research Institute of Radio wave Propagation (CRIRP). "Radio waves were absorbed by the strong F layer created by the flare."
http://www.southgatearc.org/news/jan2005/china_storm.htm
http://www.southgatearc.org/news/jan2005/china_storm.htm