Space Weather Message Code: ALTEF3Serial Number: 1775 Issue Time: 2011 Mar 05 0523 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 1774 Begin Time: 2011 Mar 02 1405 UTC Yesterday Maximum 2MeV Flux: 12612 pfu Electron Events can persist for days, but the flux values observed at geosynchronous orbit follow a strong diurnal cycle due to the geometry of the Earth’s magnetic field. Maximum values generally occur near local noon locations on the daytime side of the Earth. ALERTS for Electron Events are therefore issued once per "satellite day" based on data from SWPC's primary GOES satellite, when electron fluxes have exceeded the event threshold (1000 pfu). The "satellite day" for GOES East, SWPC's current primary Electron satellite, is approximately 0500 to 0500 UTC; for GOES West, the secondary GOES Electron satellite, its approximately 0900 to 0900 UTC. On subsequent "days", an additional Electron ALERT is issued upon a new threshold crossing, and include the prior day's maximum flux time and value observed (if it occurred). No Electron ALERTS are issued on "days" when the threshold is not exceeded. As with any Electron Event, users should consider the locations of the satellite platforms of interest vs. the location of GOES, with regard to the specific timing of enhanced electron exposures that may occur. GOES East satellites are at approximates 75 degrees west longitude and GOES West at approximately 135 degrees west longitude. The satellite used is identified in the "Station" keyword, e.g. Station: GOES12 See GOES Satellite Location. |