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  • Low energy electrons: 1-100 keV
  • Ions: 0.01-1 MeV/nucleon
  • >10events per year near solar maximum
  • large e/p ratios
  • enhanced abundances of 3He and of heavy ions
  • high charge states
  • enhanced alpha/proton ratio
  • extend over 30° in solar longitude
  • associated with type III bursts
  • many clearly come from flares/microflares, but often not even a microflare or soft X-ray burst is observed.



Expected number of events

(To be verified for current sensitivity of STEP & update the table for current mission phases definitions. Also per orbit.)