Study on The Prediction Method of Characteristic Parameters of Solar X-ray Flares

Solar ?ares are important events for the space weather. The predic- tion of relevant parameters of solar ?ares has practical signi?cance for evaluating the effect of sudden ionospheric disturbance (SID). The data of soft X-ray ?ux observed by the GOES-8 satellite in the 23th solar cycle are used to predict the peak intensities and ending times of X-class ?ares with the method of data ?t- ting. Using this method to analyze the X-class ?ares in the 23th solar cycle, it is possible to predict the peak ?ux of an X-class ?are 17 minutes in advance at most. And the ending time of an X-class ?are may be predicted about 60 minutes in advance at most. The predicted results indicate that the prediction method has certain effectiveness and applicability.