flare = blask, błysk

Solar Flares – What they are,

Source: http://dgsphysics.wordpress.com/2009/07/13/solar-flares-what-they-are-effects-and-the-end-of-the-world/

blask, błysk

English sentence and Polish translation

I saw a flare behind the hill. = Widziałem błysk za wzgórzem.