@article{Palmerio and Nieves-Chinchilla and Kilpua and Barnes:2021:10.1029/2021JA029770,
author = {Palmerio and Nieves-Chinchilla and Kilpua and Barnes, D and Zhukov and Jian and Witasse and Provan and Tao and Lamy and Bradley and Mays and Mostl and Roussos and Futaana and Masters, A and Sanchez-Cano},
doi = {10.1029/2021JA029770},
journal = {Journal of Geophysical Research: Space Physics},
pages = {1--28},
title = {Magnetic structure and propagation of two interacting CMEs from the Sun to Saturn},
url = {http://dx.doi.org/10.1029/2021JA029770},
volume = {126},
year = {2021}
}

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TY  - JOUR
AB  - One of the grand challenges in heliophysics is the characterization of coronal mass ejection (CME) magnetic structure and evolution from eruption at the Sun through heliospheric propagation. At present, the main difficulties are related to the lack of direct measurements of the coronal magnetic fields and the lack of 3D in-situ measurements of the CME body in interplanetary space. Nevertheless, the evolution of a CME magnetic structure can be followed using a combination of multi-point remote-sensing observations and multi-spacecraft in-situ measurements as well as modeling. Accordingly, we present in this work the analysis of two CMEs that erupted from the Sun on April 28, 2012. We follow their eruption and early evolution using remote-sensing data, finding indications of CME–CME interaction, and then analyze their interplanetary counterpart(s) using in-situ measurements at Venus, Earth, and Saturn. We observe a seemingly single flux rope at all locations, but find possible signatures of interaction at Earth, where high-cadence plasma data are available. Reconstructions of the in-situ flux ropes provide almost identical results at Venus and Earth but show greater discrepancies at Saturn, suggesting that the CME was highly distorted and/or that further interaction with nearby solar wind structures took place before 10 AU. This work highlights the difficulties in connecting structures from the Sun to the outer heliosphere and demonstrates the importance of multi-spacecraft studies to achieve a deeper understanding of the magnetic configuration of CMEs.
AU  - Palmerio
AU  - Nieves-Chinchilla
AU  - Kilpua
AU  - Barnes,D
AU  - Zhukov
AU  - Jian
AU  - Witasse
AU  - Provan
AU  - Tao
AU  - Lamy
AU  - Bradley
AU  - Mays
AU  - Mostl
AU  - Roussos
AU  - Futaana
AU  - Masters,A
AU  - Sanchez-Cano
DO  - 10.1029/2021JA029770
EP  - 28
PY  - 2021///
SN  - 2169-9380
SP  - 1
TI  - Magnetic structure and propagation of two interacting CMEs from the Sun to Saturn
T2  - Journal of Geophysical Research: Space Physics
UR  - http://dx.doi.org/10.1029/2021JA029770
UR  - https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2021JA029770
UR  - http://hdl.handle.net/10044/1/92600
VL  - 126
ER  - 

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