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A large-scale instability competing with Kelvin-Helmholtz at Mercury's boundary layer

Abstract : Magnetic reconnexion and Kelvin-Helmholtz (KH) instability are usually recognized as the two main mixing processes along magnetopauses. However, a recent work [Dargent et al., 2019] showed that in Mercury"s conditions, another instability can grow faster than the KH instability along the magnetopause. This instability seems to rely on gradients of density and/or magnetic field and develops large-scales finger-like structures that prevents the growth of the KH vortices. In this work, I will characterize this instability and try to identify it. In particular, I will look at the dependance of the growth rate of this instability to the different parameters of the plasma and compare it to the growth rate of the Kelvin-Helmholtz instability.
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https://hal-insu.archives-ouvertes.fr/insu-03559305
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Submitted on : Sunday, February 6, 2022 - 2:53:55 PM
Last modification on : Thursday, August 4, 2022 - 4:55:38 PM

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Jérémy Dargent, Federico Lavorenti, Pierre Henri, Francesco Califano. A large-scale instability competing with Kelvin-Helmholtz at Mercury's boundary layer. vEGU21, 0000, à renseigner, Unknown Region. ⟨10.5194/egusphere-egu21-9413⟩. ⟨insu-03559305⟩

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