An M7.9 class flare. A solar flare is an intense burst of radiation coming from the release of magnetic energy associated with sunspots. Flares are our solar system’s largest explosive events.
Solar Flares Likely Knocked Military Satellites Offline -- US News and World Report
Solar storms earlier this month may have caused military satellites to reboot.
Despite being made to withstand radiation emitted from solar flares, a storm caused by the sun earlier this month may have temporarily knocked American military satellites offline, according to General William Shelton, head of the Air Force's Space Command.
The energy particles associated with two solar storms March 9 and 10 may have caused what are called "single event upsets" on military satellites. "The timing is such that we say this was likely due to [solar radiation]," Shelton told reporters at a Defense Writers Group breakfast Thursday. Although it's impossible to tell exactly what caused the events—essentially a temporary reboot of satellite instrumentation software—solar storms are known to wreak havoc on satellites.
Read more ....
Update: General: Recent solar storm interfered with Air Force satellite -- Stars and Stripes
My Comment: An event like this makes you appreciate on why emp weapons are feared by the military.