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    • The cosmic-ray ground-level enhancement of 1989 September 29 

      Moraal, H.; Cabellero-Lopez, R.A. (IOP Publishing, 2014)
      The ground-level enhancement (GLE) of 1989 September 29 is one of the largest of 71 solar energetic particle events observed by neutron monitors on Earth. It was smaller than the record-breaking GLE 5 of 1956 February 23, ...