A Package for Non-Equilibrium Ionization Simulations in Plasma with Arbitrary Electron Distributions

Non-equilibrium ionization (NEI) is a critical physical process in astrophysical environments where the plasma's thermodynamic timescales are shorter than the ionization or recombination timescales, such as in the solar wind and solar eruptions. In such rapidly evolving plasmas,  the charge states of ions are governed by time-dependent ionization equations. In this work, we report a package designed to perform fast NEI calculations using the eigenvalue method. A key feature of this package is that it can be applied in various plasma environments with arbitrary non-Maxwellian electron distributions. Furthermore, it supports both post-process analysis by tracking the movement of plasma deduced from MHD simulation and in-line calculation within MHD modeling. Finally, we show one application of this package in investigating solar wind evolution with various Kappa electron distributions. This code is freely available for download from the Web.