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Influence of the coronal mass ejection orientation on its propagation

Configuration of the interplanetary magnetic field and related ambient solar wind features in the ecliptic and meridional planes are different. Therefore, one can expect that the coronal mass ejection (CME) inclination influences the propagation of the CME itself. This study aims to investigate the non-radial flow in the sheath region of the interplanetary CME (ICME) in order to provide the first proxy to relate the ICME orientation with its propagation. We investigated isolated CME-ICME events from the period 1997-2018. We obtained the CME tilt in the “near-Sun” environment by performing the ellipse fitting technique to the CME outer front as determined from the SOHO/LASCO coronagraph. In the “near-Earth” environment, we obtained the orientation of the corresponding ICME using in-situ plasma and field data and we investigated the non-radial flow in its sheath region. Most of the CME-ICME pairs under investigation were found to be characterized by a low inclination. For the majority of CME-ICME pairs, we obtain consistent estimations of the dominant inclination from remote and in situ data. The observed non-radial flows in the sheath region show a greater y-direction to z-direction flow ratio for high-inclination events, indicating that the CME orientation could have an impact on the CME propagation.

Sun, Heliosphere, coronal mass ejection, flux rope

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