X Marks the Spot

Feb 1, 2012 An X-2 class solar flare recently missed a direct impact with Earth. Heliophysicists classify solar flares according to their brightness in X-ray wavelengths. C-class flares are the smallest on the scale, with X-ray measurements in the 10^-6 watts per square meter range (W/m^2), while X-class flares can…