Improving the Spectral Fit for the Diffuse Soft X-ray Background using ATOMDB Charge Exchange Models

The origin of the diffuse soft X-ray background has always been ground for many questions and debates. Previous investigations have concluded that this background radiation could be mostly due to charge exchange (CX), caused by the interaction between highly energized ions from the solar winds and neutral hydrogen and helium atoms. In 2014, simplified CX models were constructed, which successfully fit the high-resolution spectral data from the Diffuse X-ray Spectrometer mission (DXS), flown in 1993 (Smith, 2014). This model has since been deployed to analyze potential CX in a range of other plasmas (Zhang et al., 2017). In 2017, updated CX cross section data was released by the Kronos project, including velocity dependent cross sections for all ions. In this project, we incorporate this data into the CX models, then compare the two versions of the AtomDB Charge Exchange Model (ACX) by re-analyzing the DXS data for the solar winds. Our results show significant changes in the spectrum for some ions, but an overall improvement in the model fit.