Dataset Open Access

Samples of solar flares classes, active regions and time of occurrence

Gradvohl, André Leon Sampaio; Fernandes, Matheus Evers Rodrigues

This dataset contains samples of solar flares measurements of classes X, M, C and B.

For clarification, the flares are classified as follows:

  • Class X: flares \(>10^{-4} watts/m^{2}\)
  • Class M: \(10^{-5} watts/m^{2} <\)flares \(<10^{-4} watts/m^{2}\)
  • Class C: \(10^{-6} watts/m^{2}<\)flares\(<10^{-5} watts/m^{2}\)
  • Class B: \(10^{-7} watts/m^{2}<\)flares\(<10^{-6} watts/m^{2}\)

This dataset was assembled with data from

The date (yyyy-mm-dd hh:mm:ss) the authors assembled the data is 2017-11-14 13:48:37

The original data source is the National Oceanic & Atmospheric Administration (NOAA), U.S. Departement of Commerce.

Data description:

  • Class: Class of the flare: X, M, C or B
  • Date: Date of occurence in yyyy-mm-dd format.
  • AR: Active Region ID attributed by NOAA.
  • Begin: time the flare begins in hh:mm:ss format.
  • Max: time the flare reaches its max value in hh:mm:ss format.
  • End: time the flare vanishes in hh:mm:ss format.

The dataset has 2,256 tuples divided as follows:

  • 171 tuples with X class flares data (7.58%).
  • 572 tuples with M class flares data (25.35%).
  • 767 tuples with C class flares data (34%).
  • 746 tuples with B class flares data (33.07%).

The data collected refer to the period between August 25, 1996 and May 29, 2017.

The HighPIDS research group ( use this dataset to apply Deep Learning algorithms to classify magnetograms of the Sun.
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