We use the Dynamic LATMOS Test Particle (D-LaTeP) model to simulate soft X-ray emissions during the 19 October 2001 Coronal Mass Ejection (CME) event and compare the results with XMM-Newton observations. The simulation presents the evolution of X-ray emissions near Earth during the event and shows that multiply charged heavy ions can enter the magnetosphere, generating significant soft X-ray emission in the ring current region. Such emissions inside the magnetosphere should be physically plausible. Line of sight intensities of the simulated X-ray derived along the XMM-Newton viewing geometry agree well with the observations, indicating the reliability. To provide simulation-based support for the imaging missions, we calculate observation‑like images from the simulation for the CME event, which reveal that ring current X‑ray emissions may contribute substantially to global X‑ray signatures. These results suggest that X-ray contributions inside the magnetosphere should be considered when interpreting soft X-ray observations and developing boundary detection techniques for imaging missions.
Furthermore, we present a method based on Tangent Fitting Analysis (TFA) and Hough transform to extract the location of magnetopause from the X-ray image. Specifically, it finds the optimum match of tangent curves of parameterized magnetopause function and brightest arc in the X-ray image.