An almost-X flare illuminates Earth

Reprinted from

STRONG SOLAR FLARE: A big, active sunspot (AR1515) is growing on the Earthside of the sun. This morning it erupted, producing an M5.6-class solar flare that ionized Earth’s upper atmosphere with a brief but intense pulse of X-rays and extreme ultraviolet radiation.  More eruptions are in the offing as the sunspot turns to face Earth.  Check for more information and updates. [NOTE: the NASA video of the ultraviolet flash is spectacular!]


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