According to 10 MeV flux levels, SPE alert messages are issued with 2 types: SPE Alerts and SPE Summary. SPE Alerts (and EXTENDED Alerts) are issued when 10 MeV flux levels exceeding 10, 100, 1,000, 10,000, or 100,000 pfu confirmed. A SPE Summary is issued when 10 MeV flux make a confirmed drop below 10,000, 1,000, 100, or 10 pfu thresholds, which includes date/times for begin, maximum, end, and applicable flux data. Besides, SPE alert messages are categorized into 3 scales (Yellow, Orange and Red). “Yellow” means SPE is minor with 10 MeV flux between 10 to 100 pfu, “Orange” means SPE moderate with flux between 100 to 1000 pfu, and “Red” means SPE strong with flux greater than 1000 pfu.