CME Magnetic Structure and IMF Preconditioning Affecting SEP Transport

Erika Palmerio, Emilia Kilpua, Olivier Witasse, David Barnes, Beatriz Sánchez‐Cano, Andreas J. Weiss, Teresa Nieves-Chinchilla, Christian Möstl, Lan K. Jian, Marilena Mierla, Andrei N. Zhukov, Jingnan Guo, Luciano Rodriguez, Patrick J. Lowrance, Alexey Isavnin, Lucile Turc, Yoshifumi Futaana, Mats Holmström

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review


Coronal mass ejections (CMEs) and solar energetic particles (SEPs) are two phenomena
that can cause severe space weather effects throughout the heliosphere. The evolution of CMEs, especially
in terms of their magnetic structure, and the configuration of the interplanetary magnetic field (IMF)
that influences the transport of SEPs are currently areas of active research. These two aspects are not
necessarily independent of each other, especially during solar maximum when multiple eruptive events
can occur close in time. Accordingly, we present the analysis of a CME that erupted on May 11, 2012
(SOL2012-05-11) and an SEP event following an eruption that took place on May 17, 2012 (SOL2012-05-
17). After observing the May 11 CME using remote-sensing data from three viewpoints, we evaluate its
propagation through interplanetary space using several models. Then, we analyze in-situ measurements
from five predicted impact locations (Venus, Earth, the Spitzer Space Telescope, the Mars Science
Laboratory en route to Mars, and Mars) in order to search for CME signatures. We find that all in-situ
locations detect signatures of an SEP event, which we trace back to the May 17 eruption. These findings
suggest that the May 11 CME provided a direct magnetic connectivity for the efficient transport of
SEPs. We discuss the space weather implications of CME evolution, regarding in particular its magnetic
structure, and CME-driven IMF preconditioning that facilitates SEP transport. Finally, this work remarks
the importance of using data from multiple spacecraft, even those that do not include space weather research as their primary objective.
ArtikelnummerARTN e2020SW002654
TidskriftSpace Weather
Antal sidor37
StatusPublicerad - apr 2021
MoE-publikationstypA1 Tidskriftsartikel-refererad


  • 115 Rymdvetenskap och astronomi

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