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Forecasting space weather storms driven by sheath regions of Coronal Mass Ejections

Emilia Kilpua - University of Helsinki; Simon Good - University of Helsinki, Finland; Matti Ala-Lahti - University of Helsinki, ; Dominique Fontaine - LPP, CNRS, Ecole Polytechnique, France; Adnane Osmane - Universiyt of Helsinki, Finland; Erika Palmerio - University of Berkeley, United States; Lina Hadid - LPP, CNRS, Ecole Polytechnique, France; Miho Janvier - Institut d'Astrophysique Spatiale, CNRS, Université Paris-Sud, France; Emiliya Yordanova - Swedish Institute of Space Physics, Uppsala, Sweden

Session: Interplanetary CMEs and Solar Particle Events


Abstract

Fast coronal mass ejections (CMEs) drive turbulent sheaths ahead that often cause intense space weather storms, disturbing particularly strongly the high-latitude magnetosphere and the radiation belt environment. The storms related to them come also often unexpected. Forecasting the impact of the sheath is particularly challenging since they have a highly variable and complex structure that gradually accumulates from the inhomogeneous plasma and field the CME encounters as it ploughs through the solar wind. Increased knowledge of how sheaths form and evolve, and how their properties are controlled by the CME and ambient solar wind conditions could help in predicting their effects.

In this presentation we give the overview of sheaths as drivers of space weather storms and related challenges, and show our latest results on how the key geoeffective parameters in sheaths are controlled by the properties of the CME/shock driver and the ambient solar wind. Integral part of our studies has been to investigate separately different parts of the sheath. Our results also support the view of the complex formation of sheaths and different physical mechanisms playing a role in generating fluctuations in them.



Approaching deadlines:

Registration opens:

16 July 2020

Abstract submission opens:

16 July 2020

European Space Weather Medals:

6 September 2020

Registration deadline:

25 September 2020

Registration deadline: [extended]

10 October 2020

Abstract submission deadline:

4 September 2020