Friday, August 07, 2015

Fascinating science

RealClimate: Ice-core dating corroborates tree ring chronologies

Here's an interesting story of work done to resolve apparent conflict between tree ring temperature chronologies and those from ice cores.

The one thing I would like to know more about is this part of the story:
In 2012, Miyaki et al. discovered a rapid increase of radiocarbon (14C) in Japanese cedar, precisely dated to AD 774-775. The cause of this increase was possibly due to a very high energy solar proton event (Usoskin et al., 2013), and its effect on radiocarbon has been observed in tree ring chronologies in both hemispheres (G├╝ttler et al., 2015). Another rapid, slightly smaller (~60%), radiocarbon production event has been dated to AD 993-994 (Miyake et al., 2013).
Do we know what causes "very high energy solar proton events"?

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