When they say ‘sudden’ they don’t mean short-lived. The report notes that ‘some of the events, unlike the brief flashes we recognize as solar flares, lasted for one or two years’. Only a handful of these so-called ‘cosmic barrages’ have occurred in the last 9000 years or so, according to the data.
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One of the events was 80 times more powerful than the strongest solar flare ever recorded, says LiveScience.
A series of sudden and colossal spikes in radiation levels across Earth’s history could have come from a series of unknown, unpredictable and potentially catastrophic cosmic events, a new study has revealed.
Named Miyake events after the lead author of the first study to describe them, the spikes occur roughly once every 1,000 years or so and are recorded as sudden increases in the radiocarbon levels of ancient tree rings.
The exact cause of the sudden deluges of radiation, which periodically transform an extra chunk of the atmosphere’s nitrogen into carbon sucked up by trees, remains unknown.
The leading theory among scientists is that Miyake events are solar flares that are 80 times more powerful than the strongest flare ever recorded. But a new study, published Oct. 26 in the journal Proceedings of the Royal Society A: Mathematical, Physical, and Engineering Sciences, suggests that the origin of the radiation bursts could be even more mysterious than first thought.
“These huge bursts of cosmic radiation, known as Miyake Events, have occurred approximately once every thousand years but what causes them is unclear,” lead author Benjamin Pope, an astrophysicist at the University of Queensland, Australia, said in a statement. “We need to know more, because if one of these happened today, it would destroy technology including satellites, internet cables, long-distance power lines and transformers. The effect on global infrastructure would be unimaginable.”
Each year, temperate tree species develop a new concentric ring around their trunks that, added up, indicates their age. Because trees suck up carbon from the atmosphere, scientists can study the amount of radiation in the atmosphere during Earth’s recent history by measuring tree rings for quantities of the radioactive isotope carbon-14 — produced when energetic cosmic rays collide with atmospheric nitrogen.
Scientists have spotted six Miyake events in tree rings so far, indicated by sudden, single-year leaps in the concentrations of carbon-14 and other isotopes; these occurred in the years 7176 B.C., 5410 B.C., 5259 B.C., 660 B.C., A.D. 774 and A.D. 993; alongside a number of other, smaller events spotted at other times.
To investigate if the sudden carbon-14 spikes were caused by incredibly powerful solar flares, the researchers created a simplified model of the global carbon cycle; inputting the tree ring data to demonstrate how carbon was produced by solar radiation and absorbed into Earth’s atmosphere, oceans, land and organisms.
By comparing their timeline of atmospheric carbon with the known 11-year solar cycle, the researchers expected to find that the years of the Miyake events corresponded to moments of peak solar activity.
But instead they discovered that the Miyake events did not line up with peak solar activity, and some of the events, unlike the brief flashes we recognize as solar flares, lasted for one or two years.
“Rather than a single, instantaneous explosion or flare, what we may be looking at is a kind of astrophysical ‘storm’ or outburst,” first author Qingyuan Zhang, a mathematician at the University of Queensland, said in the statement.
The intensity of these unexplained cosmic barrages is hard to understate.
Full article here.
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