Source code for 2d fdtd elf propagation of the earth

hi all

currently i am working on 2d fdtd elf propagation of the earth, trying to reproduce results from jamesina simpson's paper 'Two dimensional fdtd model of antipodal elf propagation and schumann resonance' and looking for the source codes as reference. anyone here have the source codes of the model? it very helpful if you can send it to tetikush3@yahoo.com

thank you very much