The Solar x-ray flare（SXR）alerts provide information on Major Flares (with peak X-ray flux above M1(1.0e-5 w/m2)). An initial ALERT is issued in near-real-time when the flux exceeds the M1 level on the primary GOES satellite. After the flux has reached a confirmed maximum and decreased to a half-peak flux level, a SUMMARY is issued with details of the event. There are three-level alerts according to the solar x-ray flux. The yellow color means the flux is between M1 and X1, orange color means the flux is between X1 and X10, red color means the flux is above the X10. If the color is green, it means the flux is under M1.
From the web we can see SXR alerts 27-day-cycle review and search history alerts.