Cosmic ray modulation strength (Phi) since 1936


The monthly values of the modulation parameter Phi (in MV) reconstructed from the ground-based cosmic ray data since 1936 are presented in tabular and vector form.

Full description of the procedure and the reference to these data can be found in:

  • Usoskin et al., Heliospheric modulation of cosmic rays: Monthly reconstruction for 1951-2004, J. Geophys. Res., 110, A12108, 2005.
  • Usoskin, I. G., G. A. Bazilevskaya, and G. A. Kovaltsov, Solar modulation parameter for cosmic rays since 1936 reconstructed from ground-based neutron monitors and ionization chambers, J. Geophys. Res., 116, A02104, 2011 (doi:10.1029/2010JA016105).

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    Last modified 08.02.2016 by Ilya Usoskin