ACE SIS Level 2 Data

You might like to try our alternate ACE Level 2 data server


Solar Energetic Particle, Low Energy Galactic Cosmic Ray,
and Anomalous Cosmic Ray Fluxes

Please read the Release Notes for new caveats/warnings for SIS data from September 2024 onwards

256-second Averages   (Yearly Data Files)

Hourly Averages   (27-day Bartels rotations   DOY/Year)

Daily Averages   (27-day Bartels rotations   DOY/Year)

Bartels Rotation (27-day) Averages   (begin DOY/Year - end DOY/Year)
  Full Data Range   226/1997 - 204/2025

SIS Data Documentation

ACE Level 2 HDF files

ACE Level 2 HDF files via ftp



Last Updated: Mon Aug 18 01:38:06 PDT 2025
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