Differential intensity integrated over the mission duration and forecast.

This site provides access to the main HelMod web calcultor - which is an application of the latest available HelMod Code - for unregistered users, e.g.,

HelMod data sets and results can be freely downloaded or copied. However, we strongly suggest user to provide an appropriate acknowledgment and/or citation, e.g., see  Citations or Bibliography  pages.

How to use this HelMod Calculator

This tools evaluates the modulated spectrum at Earth orbit for theorical LIS evaluated with GALPROP. The particle transport is described using the Helmod Model. For information about the computation method please refear to Monte Carlo Integration page.

The input parameters and options for the tool are described below. Once the input form has been completed,  "Submit" button will start the calculation and open the "Results" page (allow for pop-up in your browser settings).


Solar Modulation Model

The website is always updated with the latest HelMod version available, as indicated in the output result.
Previous version remains available for a limited period during updating.

Expected Mission Duration/ Past Missions

User can select either the time interval for the interested simulation or refer to a standard published dataset (e.g., AMS-02).

Display Options



The result page contains the figure of modulated spectrum and and correspondent tabulated data.
Text file and numpy/python archive are also available for Download.


Advanced Controls:

For expert users it is available the possiblity to modify some relevant HelMod parameters.

Available parameters may change for different HelMod version. For latest default parameters please refer to Current and History of default parameters page.

HelMod provide optimized LIS developed with GALPROP and presented on international journals, Expert users may load their own develped LIS. HelMod accept the following formats:


It should be remarked that data generated by using the Calculator may be used by HelMod developers for statistical purpose.

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