The large sunspot AR 1429 has unleashed its most powerful flare yet, hurling a bright coronal mass ejection (CME) into space and it may have Earth’s name on it.

This morning (7 March) at 00.28h UT NASA’s Solar Dynamics Observatory recorded the immense ultra-violet flash of an X5-class solar flare resulting in a CME heading our way. Astronomers are not certain yet if the CME will hit the Earth head-on, but it is likely that it will strike a glancing blow on March 8 or 9.

The good news for solar observers is that AR 1429 is evolving and growing in size as it slow rotates toward the Sun’s central meridian. It is still a number of days from transiting and there is plenty of time to hope for a break in the cloudy conditions; looking at the UK forecast, this afternoon and tomorrow morning look promising (7-8 March).

For an explanation of the classification of solar flares visit spaceweather.com/glossary/flareclasses