Sun releases massive solar flare
The sun has produced its largest flare in four years, observers say, prompting warnings of potential interference with electrical power grids and communications on Earth.
Nasa's Solar Dynamics Observatory (SDO) recorded the so-called X-flare, the strongest type, from a sunspot at 0156 GMT on 15 February.
In these images, the flare can be seen emanating from the bright spot just right of the centre.
Images courtesy Nasa / SDO