Answer: solarflare

AnswerCrossword Clue
SOLARFLAREEruption on the sun
SOLARFLAREPhenomenon that emits X-rays
SOLARFLAREBrightening near a sunspot
SOLARFLARESun's sudden energy release
SOLARFLARESun eruption
SOLARFLARESudden brightening near a sunspot