For citation please quote: (replace year,month with database access date)

P Bobik, M J Boschini, S Della Torre, M Gervasi, D Grandi, G La Vacca, S Pensotti, M Putis, P G Rancoita, D Rozza, M Tacconi and M Zannoni, On the forward-backward-in-time approach for Monte Carlo solution of Parker's transport equation: One-dimensional case. Journal of Geophysical Research: Space Physics 121(5):3920–3930, 2016. doi:10.1002/2015JA022237.

P Bobik, G Boella, M J Boschini, C Consolandi, S Della Torre, M Gervasi, D Grandi, K Kudela, S Pensotti, P G Rancoita and M Tacconi. Systematic Investigation of Solar Modulation of Galactic Protons for Solar Cycle 23 Using a Monte Carlo Approach with Particle Drift Effects and Latitudinal Dependence. Astrophys. J. 745:132, 2012, doi:10.1088/0004-637X/745/2/132.

HelMod Online calculator (version 3.3.0) [year,month]:

History of Major Change in WebModel


Jan. 26th 2017


Jan. 12th 2017

  • A systematic cross check between Solar Modulator and Online Calculator was performed for proton, antiproton and helium. Additional systematic discrepancy must accounted in  modulated spectrum not covered by experimental data listed here (or covered by years-integrated experimental data like, e.g., 2011-2013).


Jan. 2nd 2017


Nov. 1st 2016

  • Online script use  asymmetric experimental errors.
  • A new best configuration setted as default.
  • Solar Modulator updated up to CR2178.  
  • Online calculator and Solar Modulator accept plain text file as input for the LIS
3.0.0 Web program and documentation online.
Sept. 1st 2016