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The recent launch of Solar Orbiter and BepiColombo opened a brief window inwhich these two spacecraft were positioned in a constellation that allows forthe detailed sampling of any Earth-directed CMEs. Fortunately, two such eventsoccurred with in situ detections of an ICME by Solar Orbiter on the 19th ofApril and the 28th of May 2020. These two events were subsequently alsoobserved in situ by BepiColombo and Wind around a day later. We attempt toreconstruct the observed in situ magnetic field measurements for all threespacecraft simultaneously using an empirical magnetic flux rope model. Thisallows us to test the validity of our flux rope model on a larger and moreglobal scale and allows for cross-validation of the analysis with differentspacecraft combinations. Finally, we can also compare the results from the insitu modeling to remote observations obtained from the STEREO-A heliosphericimagers. We make use of the 3D coronal rope ejection model in order to simulatethe ICME evolution. We adapt a previously developed ABC-SMC fitting algorithmfor the application to multi point scenarios. We show that we are able togenerally reconstruct the flux ropes signatures at three different spacecraftpositions simultaneously using our model in combination with the flux ropefitting algorithm. For the well-behaved 19th of April ICME our approach worksvery well. The 28th of May ICME, on the other hand, shows the limitations ofour approach. Unfortunately, the usage of multi-point observations for theseevents does not appear to solve inherent issues, such as the estimation of themagnetic field twist or flux rope aspect-ratios due to the specificconstellation of the spacecraft positions. As our general approach can be usedfor any fast forward simulation-based model we give a blueprint for futurestudies using more advanced ICME models.

Multi point analysis of coronal mass ejection flux ropes using combined data from Solar Orbiter, BepiColombo and Wind