On February 13, 2011, sunspot 1158 let loose the strongest solar flare of the current solar cycle, a blast of radiation across the electromagnetic spectrum, from radio waves to x-rays and gamma-rays. NASA’s Solar Dynamics Observatory recorded an intense flash of extreme ultraviolet radiation, as seen above, and located in approximately the middle of the Sun’s disk in the image below.
![](/Images/en/UserFiles/الشمس-تطلق-اكبر-توهج-دائري.jpg)
The eruption also produced a loud blast of radio waves, and coronagraph data from STEREO-A and SOHO agree that the explosion produced a fast but not particularly bright coronal mass ejection.
The Astronomical Research Center (A.R.C) mentioned that Spaceweather.com predicts a CME cloud will likely hit Earth’s magnetic field on or about Feb. 15th, and high-latitude sky watchers should be alert for auroras.
![](/Images/en/UserFiles/الشمس-تطلق-اكبر.jpg)
Jason Major from Lights in the Dark created the video below of magnetic activity around a sunspot 1158, from data region from SDO spacecraft, during February 12-13, 2011.