From ViRBO

All software is available at ftp://virbo.org/users/selesnick/sizm

This software provides user access to the radiation belt proton, antiproton, and secondary model described in detail by:

Selesnick, R. S., M. D. Looper, and R. A. Mewaldt (2007), A theoretical model of the inner proton radiation belt, Space Weather, 5, S04003, doi:10.1029/2006SW000275.

Selesnick, R. S., M. D. Looper, R. A. Mewaldt, and A. W. Labrador (2007), Geomagnetically trapped antiprotons, Geophys. Res. Lett., 34, L20104, doi:10.1029/2007GL031475.

Selesnick, R. S., M. D. Looper, and R. A. Mewaldt (2008), A model of the secondary radiation belt, J. Geophys. Res., 113, A11221, doi:10.1029/2008JA013593.

1. Version 1.4

2012-10-29

Some bug fixes and minor improvements.

2. Version 1.3

2009-07-29

Added an option for calculating the east-west effect (by moving from the satellite location to the guiding center). See pdf for an example result and pdf for related results from PAMELA experiment.

3. Version 1.2

2009-11-17

Initial public release