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The Angular Size of Coronal Mass Ejections: STEREO Measurements and Consequences for Future Missions

Authors

Lugaz,  Noé
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Zhuang,  Bin
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Scolini,  Camilla
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Lee,  Christina
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Al-Haddad,  Nada
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Möstl,  Christian
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Farrugia,  Charles
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Winslow,  Réka
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Lillis,  Robert
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Galvin,  Antoinette
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Lugaz, N., Zhuang, B., Scolini, C., Lee, C., Al-Haddad, N., Möstl, C., Farrugia, C., Winslow, R., Lillis, R., Galvin, A. (2023): The Angular Size of Coronal Mass Ejections: STEREO Measurements and Consequences for Future Missions, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4582


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020992
Abstract
Coronal mass ejections are observed remotely by coronagraphs with angular widths, for the "flux rope", of 60-90 deg. Past studies from single events measured by two spacecraft at the same heliocentric distance or statistical studies of events measured by two spacecraft at different distances have revealed that the angular width of CME magnetic ejecta may be 40-60 deg near 1 AU. Here, we present a more in-depth analysis of CME measurements by STEREO-A and Wind in 2020-2022 when the two spacecraft separation decreased from 60 to 20 deg. We find that multi-spacecraft measurements are rare, even for two spacecraft at 1 AU separated by 25-30 deg. We discuss how this affects future mission concepts and how it reveals that dedicated multi-spacecraft missions with spacecraft separations of 20 degrees or less are needed to advance our understanding of CMEs.