Miyake events, bursts of global radiation recorded in tree rings, have been detected around the world and are thought to have an extraterrestrial origin.
So, Pope and his colleagues put the leading hypothesis to the test. They analyzed all publicly available tree ring data on the six Miyake events using computer simulations of Earth’s carbon cycle. This allowed the team to calculate the duration, timing and amplitude of each event.
And if solar flares did cause the events, then trees nearer the poles, where Earth’s protective magnetic field is weaker, should contain higher levels of Miyake event radiation. But the researchers found no such trend.
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