Modeling of geocoronal solar wind charge exchange events detected with Suzaku.

This article focuses on developing and validating an empirical model of geocoronal solar wind charge exchange (SWCX) emission by comparing it with five bright geocoronal SWCX events detected by the Suzaku satellite. The model integrates an exospheric neutral hydrogen distribution, solar wind ion data from the ACE and WIND satellites, charge exchange cross-sections, and Earth's magnetospheric magnetic field models to predict time-variable soft X-ray emissions, particularly O vii and O viii lines. Results show that the model reproduces observed O vii intensities within a factor of three in most cases, except during a major geomagnetic storm with line-of-sight toward the night side of the high-latitude magnetosheath, while O viii intensities are consistently underestimated. The modeled light curves, after scaling, successfully capture temporal variations including spikes caused by Suzaku's orbital motion through magnetospheric cusp regions, highlighting the model's potential for future X-ray astronomy and magnetospheric imaging missions.