1. Radioactive Traces in Tree Rings Reveal Earth's History of Unexplained 'Radiation Storms'  Singularity Hub
  2. Tree rings document mega radiation storms | WORLD  WORLD News Group
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A half dozen giant radiation storms have bombarded Earth over the past 10,000 years. Their source is a mystery, but tree rings yield clues.A half dozen giant radiation storms have bombarded Earth over the past 10,000 years. Their source is a mystery, but tree rings yield clues.

Radioactive Traces in Tree Rings Reveal Earth’s History of Unexplained ‘Radiation Storms’

Tree rings record six known Miyake events — spikes in global radiation levels in the past. The sun, as long presumed, might not be the sole culprit.Tree rings record six known Miyake events — spikes in global radiation levels in the past. The sun, as long presumed, might not be the sole culprit.

Huge solar storms may not explain shadows of radiation in trees