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Space environment alerts are issued for four categories: Relativistic Electron Enhancement(REE)、Geomagnetic storm(GMS)、Solar proton event(SPE) and Solar x-ray flare(SXR). There are 3 types of Space Weather Alert Messages:alert、continuation alert and summary. Alert messages are issued when an event threshold is crossed and contain information that is available at the time of issue. Continuation alert messages are issued when an event is proceeding in next day. Summary messages are issued after the event ends, and contain additional information available at the time of issue. There are three-level alerts according to the eruption. The yellow color means minor storm, orange color means moderate storm and red color means strong storm. If the color is green, it means quiet condition. From the web we can see Space environment alerts 27-day-cycle review and search history alerts.
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