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Radiocarbon Production Events and their Potential Relationship with the Schwabe Cycle.

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Extreme cosmic radiation events in 774/5 and 993/4 CE likely stemmed from intense solar storms. New radiocarbon data supports this, showing these events coincided with solar cycle maximums.

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Area of Science:

  • Cosmic ray physics
  • Solar physics
  • Paleoclimatology

Background:

  • Anomalous radiocarbon spikes in tree rings indicate extreme cosmic radiation events in 774/5 and 993/4 CE.
  • Hypotheses often attribute these events to solar storms, but direct evidence is limited.

Purpose of the Study:

  • To investigate the solar origin of extreme cosmic radiation events using high-precision radiocarbon measurements.
  • To analyze the 774/5 CE, 993/4 CE, and 1859 CE Carrington Event in relation to solar activity.

Main Methods:

  • Accelerator Mass Spectrometry (AMS) measurements of radiocarbon in tree rings.
  • Analysis of 169 new and published tree-ring data points spanning the events.
  • Correlation of radiocarbon production with the 11-year solar cycle (Schwabe cycle).

Main Results:

  • The study delineated radiocarbon production modulation linked to the Schwabe solar cycle.
  • Data suggests the 774/5 CE and 993/4 CE events occurred near solar cycle maximums.
  • The Carrington Event, despite lacking a radiocarbon signature, also aligns with solar cycle maximums.

Conclusions:

  • Experimental data provides support for a common solar origin for the studied extreme cosmic radiation events.
  • The findings strengthen the link between intense solar storms and radiocarbon anomalies.
  • The 11-year solar cycle plays a significant role in modulating cosmic ray events.