Levels of potentially dangerous cosmic radiation in Earth's atmosphere rose to a two-decade high in November after a rare solar super-flare pummeled the planet with high-speed particles from the sun.

Rare solar flare caused radiation in Earth's atmosphere to spike to highest levels in nearly 20 years, researchers say

Source: space
Source Link: https://www.space.com/astronomy/sun/rare-solar-flare-caused-radiation-in-earths-atmosphere-to-spike-to-highest-levels-in-nearly-20-years-researchers-say