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Interplanetary scintillation (IPS) is a useful tool for detecting coronalmass ejections (CMEs) throughout interplanetary space. Globalmagnetohydrodynamic (MHD) simulations of the heliosphere, which are usuallyused to predict the arrival and geo-effectiveness of CMEs, can be improvedusing IPS data. In this study, we demonstrate an MHD simulation that includesIPS data from multiple stations to improve CME modelling. The CMEs, whichoccurred on 09-10 September 2017, were observed over the period 10-12 September2017 using the Low-Frequency Array (LOFAR) and IPS array of the Institute forSpace-Earth Environmental Research (ISEE), Nagoya University, as they trackedthrough the inner heliosphere. We simulated CME propagation using a global MHDsimulation, SUSANOO-CME, in which CMEs were modeled as spheromaks, and the IPSdata were synthesised from the simulation results. The MHD simulation suggeststhat the CMEs merged in interplanetary space, forming complicated IPS g-leveldistributions in the sky map. We found that the MHD simulation that best fitsboth LOFAR and ISEE data provided a better reconstruction of the CMEs and abetter forecast of their arrival at Earth than from measurements when thesesimulations were fit from the ISEE site alone. More IPS data observed frommultiple stations at different local times in this study can help reconstructthe global structure of the CME, thus improving and evaluating the CMEmodelling.

Magnetohydrodynamic simulation of coronal mass ejections using interplanetary scintillation data observed from radio sites ISEE and LOFAR