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@article{Owens2022SolarEG,
  title={Solar Energetic-Particle Ground-Level Enhancements and the Solar Cycle},
  author={Mathew J. Owens and Luke A. Barnard and Benjamin J. S. Pope and Mike Lockwood and Ilya G. Usoskin and Eleanna Asvestari},
  journal={Solar Physics},
  year={2022},
  volume={297},
  url={https://api.semanticscholar.org/CorpusID:251066764}
}

Severe geomagnetic storms appear to be ordered by the solar cycle in a number of ways. They occur more frequently close to solar maximum and the declining phase, are more common in larger solar cycles, and show different patterns of occurrence in odd- and even-numbered solar cycles. Our knowledge of the most extreme space-weather events, however, comes from spikes in cosmogenic-isotope (14C, 10Be, and 36Cl) records that are attributed to significantly larger solar energetic-particle (SEP… 

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