Sunspot 1158 has just unleashed the strongest solar flare of the year,  an M6.6-category blast @ 1738 UT on Feb. 13th. The eruption appears to  have launched a coronal mass ejection (CME) toward Earth. It also  produced a loud blast of radio emissions heard in shortwave receivers  around the dayside of our planet. NOAA has an M6.6-category blast on it.  Solar flares are classified as A, B, C, M or X the highest.
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