One of the strongest types of solar flares erupted on the sun. This is how it affected Earth.

Most people are not aware of when a Solar Flare occurs. The standard solar flare is not seen by the unaided eye of humans, nor is it smart to look at the sun anyways. Despite this, they do happen. Us being on earth and within our atmosphere are generally protected from any harm a Solar Flare can cause. However, other things like power and electronics, may not escape damage.