The sun unleashed its strongest solar flare in four years Monday night, hurling a massive wave of charged particles from electrified gas into space and toward Earth.
The solar storm sent a flash of radiation that hit Earth in a matter of minutes. Now a huge cloud of charged particles is headed our way. These coronal mass ejections, as they are called, typically take about 24 hours or more to arrive. They can spark spectacular displays of the aurora borealis, or northern lights, at high latitudes and sometimes even into the northern United States.
The mega flare, which registered as a Class X2.2 flare on the scale of solar flares, was the first class X flare to occur in the new solar cycle of activity, which began last year. The sun is now ramping up toward a solar maximum around 2013.
"It has been the largest flare since Dec. 6, 2006, so a long time coming," said Phil Chamberlin, deputy project scientist for NASA's Solar Dynamics Observatory, which observed the flare. "There were some clues that led us to believe the likelihood of moderate to large flares (M class or above) could occur, but we were all surprised when it actually happened to be a large X-class."
Class X flares are the strongest types of solar flares that can erupt from the sun. There are also two weaker categories: Class M flares, which are medium strength but still powerful, and Class C flares, which are the weakest storms from the sun.
Last night's X2.2 flare is the most powerful solar eruption of the sun's current weather cycle, called Solar Cycle 24. According to the website Spaceweather.com, which monitors space weather and skywatching events, the flare was the strongest of the last four years.
"It just means that Solar Cycle 24 is ramping up!" Chamberlin told Space.com. "This is the first of probably many more X-class flares to occur over the next 2 to 4 years as we reach the peak and then descend back down from solar cycle 24 maximum." read more
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