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Multi-spacecraft observations and modelling of CME evolution through the inner heliosphere

Presentation #402.06 in the session Particle Interactions Throughout the Heliosphere.

Published onSep 18, 2023
Multi-spacecraft observations and modelling of CME evolution through the inner heliosphere

The propagation of coronal mass ejections (CMEs) through the solar corona and interplanetary space is one of the major research topics in heliophysics. These humongous structures in the heliosphere are usually observed remotely via (2D) images at various wavelengths and in situ via (1D) spacecraft encounters. It follows that it is particularly arduous to retrieve the global 3D configuration of a given CME from the limited data that are often available, but multi-spacecraft measurements in both these regimes have provided additional constraints useful for obtaining a deeper insight into CME structure and evolution.

In this work, we present observations and modelling results of a CME that erupted in September 2021. Remarkably, this event was detected in situ by four spacecraft that were close to radial alignment between 0.4 and 1 au, i.e., BepiColombo, Solar Orbiter, Parker Solar Probe, and STEREO-A. These measurements provide us with the chance to not only investigate CME evolution in the inner heliosphere in detail, but also to perform for the first time a multi-spacecraft hindcast of its magnetic fields with the Open Solar Physics Rapid Ensemble Information (OSPREI) model. We remark on the strength of multi-probe events in allowing for space weather models to be validated not at a single location, but throughout a specific interval of a CME’s journey away from the Sun, allowing us to reach a more comprehensive understanding of its evolution and/or of how its local structure compares to the global one.

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