Electron Parallel Closures

Electron parallel closures for ion charge number $Z=1$\footnote{J.-Y. Ji and E. D. Held, Phys. Plasmas {\bf 21}, 122116 (2014).} are extended for $Z>1$. Adopting the same form as the $Z=1$ kernels, parameters are computed for various $Z$. The parameters are smoothly varying in $Z$ and hence can be used to interpolate parameters and closures for noninteger, effective ion charge numbers. Electron parallel closures for $Z=1.8$ and 2.5 are presented as examples.