Solar Flares Back, But Oddly Small

Sun activity rises and falls in an 11-year-long cycle, such as this cycle from top left taken in early 1997 to bottom right, taken in early 2000. Credit: NASA

From Cosmos:

SYDNEY: After a long silence, the Sun erupted in an unusual pattern of small solar flares, said an Australian astrophysicist, which may provide a unique opportunity to predict when bigger solar flares will erupt.

Solar flares are explosions in the Sun's atmosphere marked by a burst of X-rays. They increase or decrease in a roughly 11-year cycle — larger flares can reach tens of millions of degrees Celsius and interfere with communications satellites and affect astronauts' health.

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