SH044-0012
Magnetic field fluctuation properties in CME-driven sheath regions

Tuesday, 15 December 2020
Poster
K Emilia J Kilpua1, Simon Good2, Matti M Ala-Lahti3, Adnane Osmane2, Dominique Fontaine4, Lina Hadid5, Emiliya Yordanova6 and Miho Janvier7, (1)University of Helsinki, Department of Physics, Helsinki, Finland, (2)University of Helsinki, Helsinki, Finland, (3)University of Helsinki, Physics, Helsinki, Finland, (4)CNRS, Paris Cedex 16, France, (5)École Polytechnique, Paris, France, (6)IRF Swedish Institute of Space Physics Uppsala, Uppsala, Sweden, (7)Université Paris-Saclay, CNRS, Institut d'Astrophysique Spatiale, Orsay, France
Abstract:
Coronal mass ejection driven sheath regions are important drivers of space weather. Their structure and formation is however not yet well understood. In this presentation we discuss general sheath characteristics and in particular their magnetic field fluctuations properties (spectral indices, compressibility and intermittency) in differents parts of the sheath. The results highlight that turbulent properties can vary considerably within the sheath and support the view of the complex formation of the sheath and different physical mechanisms playing a role in generating fluctuations.

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