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The sun may be coming out of its slumber at long last.
On Friday morning (May 29), our star fired off its strongest flare since October 2017, an eruption spotted by NASA’s sun-watching Solar Dynamics Observatory (SDO).
Solar flares are bursts of radiation that originate from sunspots, temporary dark and relatively cool patches on the solar surface that boast very strong magnetic fields. Scientists classify strong flares into three categories: C, M and X. Each class is 10 times more powerful than the one beneath it; M flares are 10 times stronger than C flares, but 10 times weaker than X-class events.
Related: The sun’s wrath: Worst solar storms in history
Today’s flare was an M-class eruption, so it was no monster. (And it wasn’t aimed at Earth, so there’s no chance of supercharged auroras from a potential associated coronal mass ejection of solar plasma.) But the outburst could still be a sign that the sun is ramping up to a more active phase of its 11-year activity cycle, NASA officials said. If that’s the case, the most recent such cycle, known as Solar Cycle 24, may already have come to an end.
Scientists peg the start of new cycles at “solar minimum,” the time when the sun sports the fewest sunspots and the least activity.
“However, it takes at least six months of solar observations and sunspot-counting after a minimum to know when it’s occurred,” NASA officials wrote today in an update announcing SDO’s flare detection.
Source: LINK
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