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Showing 1–7 of 7 results

Advanced filters: Author: Nicolas Brehm Clear advanced filters

Tracing ancient solar cycles with tree rings and radiocarbon in the first millennium BCE

An annually resolved tree ring radiocarbon record reveals the 11-year solar cycle in the first millennium BCE, improving understanding of past solar activity and enhancing radiocarbon dating accuracy.

Nicolas Brehm
Charlotte L. Pearson
Lukas Wacker
ResearchOpen Access06 Jan 2025
Nature Communications

Volume: 16, P: 1-10
Cosmogenic radionuclides reveal an extreme solar particle storm near a solar minimum 9125 years BP

Cosmogenic radionuclides from ice cores and tree rings indicate that an extreme solar proton event has hit Earth about 9200 years ago. Contrary to expectations, the event occurred during a quiet phase of the Sun within the 11 year solar cycle.

Chiara I. Paleari
Florian Mekhaldi
Raimund Muscheler
ResearchOpen Access11 Jan 2022
Nature Communications

Volume: 13, P: 1-9
Eleven-year solar cycles over the last millennium revealed by radiocarbon in tree rings

11-year solar cycles consistently occurred throughout the last thousand years, according to a synthesis of annually resolved tree ring radiocarbon records from central Europe.

Nicolas Brehm
Alex Bayliss
Lukas Wacker
Research04 Jan 2021
Nature Geoscience

Volume: 14, P: 10-15
Publisher Correction: Rapid ¹⁴C excursion at 3372-3371 BCE not observed at two different locations

A. J. Timothy Jull
Irina P. Panyushkina
Willy Tegel
Amendments and CorrectionsOpen Access23 Feb 2021
Nature Communications

Volume: 12, P: 1
Rapid ¹⁴C excursion at 3372-3371 BCE not observed at two different locations

A. J. Timothy Jull
Irina P. Panyushkina
Willy Tegel
ResearchOpen Access29 Jan 2021
Nature Communications

Volume: 12, P: 1-3
Tree-rings reveal two strong solar proton events in 7176 and 5259 BCE

Two extreme solar energetic particle events have been found by carbon isotopes measured in ancient tree rings in 7176 and 5259 BCE. The recorded ~2% increases of atmospheric 14 C for both events exceeds in amplitude of all previously observed events.

Nicolas Brehm
Marcus Christl
Lukas Wacker
ResearchOpen Access07 Mar 2022
Nature Communications

Volume: 13, P: 1-8
Enhancing dopaminergic signaling and histone acetylation promotes long-term rescue of deficient fear extinction

N Whittle
V Maurer
N Singewald
ResearchOpen Access06 Dec 2016
Translational Psychiatry

Volume: 6, P: e974