Statistical Properties of Soft X-ray Fluxes of Solar Flares

In order to quantitatively study the statistical properties of the soft X-ray emission in solar flares, an algorithm has been developed to automatically detect flares in a given range of peak fluxes, and to analyze the flares observed by the GOESs (Geostationary Operational Environmental Satellites) from 1980 to 2013 in two soft X-ray bands. This study indicates that the statistical characteristics of the variation of flare soft X-ray flux near the peak time are independent to the magnitude of peak flux: on the average, the rising time of flare's soft X-ray flux is about half of the decay time, and the rising and decay times in the high-energy channel are shorter than the corresponding times in the low-energy channel, however, all these times will increase with the variation amplitude of flare's soft X-ray flux.