A program to compute solar inverse Compton can be found at
http://www.mpe.mpg.de/~aws/propagate.html
and also on sourceforge http://sourceforge.net/projects/stellarics/

It can also be used for other stars and includes general-purpose inverse Compton routines for e.g. interstellar emission.
21 Feb 2012 :A routine to compute inverse Compton energy losses for any given radiation field has been added.
10 Nov 2012: an option for a logarithmic (in addition to linear) grid in angle from the sun has been added, to allow finer resolution of the rapid variation near the solar disk. The idl plotting output now produces quality plots of spectra and profiles.

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Andy Strong, MPE