title: Large 14C excursion in 5480 BC indicates an abnormal sun in the mid-Holocene.
abstract: Radiocarbon content in tree rings can be an excellent proxy of the past incoming cosmic ray intensities to Earth. Although such past cosmic ray variations have been studied by measurements of14C contents in tree rings with ≥10-y time resolution for the Holocene, there are few annual14C data. There is a little understanding about annual14C variations in the past, with the exception of a few periods including the AD 774-77514C excursion where annual measurements have been performed. Here, we report the result of14C measurements using the bristlecone pine tree rings for the period from 5490 BC to 5411 BC with 1- to 2-y resolution, and a finding of an extraordinarily large14C increase (20‰) from 5481 BC to 5471 BC (the 5480 BC event). The14C increase rate of this event is much larger than that of the normal grand solar minima. We propose the possible causes of this event are an unknown phase of grand solar minimum, or a combination of successive solar proton events and a normal grand solar minimum.
authors.affiliation: Institute for Space-Earth Environmental Research, Nagoya University, Nagoya 464-8601, Japan; fmiyake@isee.nagoya-u.ac.jp.
authors.forename: Fusa
authors.initials: F
authors.lastname: Miyake
authors.affiliation: Department of Geosciences, University of Arizona, Tucson, AZ 85721.|Arizona Accelerator Mass Spectrometry Laboratory, University of Arizona, Tucson, AZ 85721.
authors.forename: A J Timothy
authors.initials: AJ
authors.lastname: Jull
authors.affiliation: Laboratory of Tree Ring Research, University of Arizona, Tucson, AZ 85721.
authors.forename: Irina P
authors.initials: IP
authors.lastname: Panyushkina
authors.affiliation: Laboratory of Ion Beam Physics, ETH Zürich, 8093 Zurich, Switzerland.
authors.forename: Lukas
authors.initials: L
authors.lastname: Wacker
authors.affiliation: Laboratory of Tree Ring Research, University of Arizona, Tucson, AZ 85721.
authors.forename: Matthew
authors.initials: M
authors.lastname: Salzer
authors.affiliation: Laboratory of Tree Ring Research, University of Arizona, Tucson, AZ 85721.
authors.forename: Christopher H
authors.initials: CH
authors.lastname: Baisan
authors.affiliation: Arizona Accelerator Mass Spectrometry Laboratory, University of Arizona, Tucson, AZ 85721.
authors.forename: Todd
authors.initials: T
authors.lastname: Lange
authors.affiliation: Arizona Accelerator Mass Spectrometry Laboratory, University of Arizona, Tucson, AZ 85721.
authors.forename: Richard
authors.initials: R
authors.lastname: Cruz
authors.affiliation: Institute for Space-Earth Environmental Research, Nagoya University, Nagoya 464-8601, Japan.
authors.forename: Kimiaki
authors.initials: K
authors.lastname: Masuda
authors.affiliation: Institute for Space-Earth Environmental Research, Nagoya University, Nagoya 464-8601, Japan.
authors.forename: Toshio
authors.initials: T
authors.lastname: Nakamura
keywords: cosmic ray event; grand solar minimum; radiocarbon; solar proton event; tree rings