The most powerful solar flare of the year erupted from the sun Thursday, April 11, sparking a temporary radio blackout on Earth, NASA officials say.
The solar flare occurred at 3:16 a.m. EDT (0716 GMT) and registered as a M6.5-class sun storm, a relatively mid-level flare on the scale of solar tempests. It coincided with an eruption of super-hot solar plasma known as a coronal mass ejection.
'The sun's normal 11-year cycle is ramping up toward solar maximum, which is expected in late 2013.'
- NASA spokeswoman Karen Fox
"This is the strongest flare seen so far in 2013," NASA spokeswoman Karen Fox explained in a statement. "Increased numbers of flares are quite common at the moment, since the sun's normal 11-year cycle is ramping up toward solar maximum, which is expected in late 2013."
NASA's sun-watching Solar Dynamics Observatory recorded a stunning video of the strongest solar flare of 2013, showing it extreme detail. The spacecraft is one of several space-based observatories keeping track of the sun's solar weather events.
NASA officials dubbed the solar flare as a "spring fling" for the sun, which has been relatively calm as it heads into its peak activity period.
Thursday's M-class solar flare was about 10 times weaker than X-class flares, which are the strongest flares the sun can unleash. M-class solar flares are the weakest solar events that can still trigger space weather effects near Earth, such as communications interruptions or spectacular northern lights displays.
The solar flare triggered a short-lived radio communications blackout on Earth that registered as an R2 event (on a scale of R1 to R5), according to space weather scales maintained NOAA, Fox added.
When aimed directly at Earth, major solar flares and coronal mass ejections can pose a threat to astronauts and satellites in orbit. They can interfere with GPS navigation and communications satellite signals in space, as well as impair power systems infrastructure on Earth.
Fox said NASA officials are tracking the coronal mass ejection to see if it poses any space weather concerns for Earth. Meanwhile, the Solar Dynamics Observatory and other space observatories will continue to monitor the sun's activity.
"Humans have tracked this solar cycle continuously since it was discovered, and it is normal for there to be many flares a day during the sun's peak activity," Fox explained.