S320p.35 — Conditions for the existence of Kelvin-Helmholtz instability in a CME

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Aug 10th at 6:00 PM until 7:30 PM

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Author(s): Vera Jatenco-Pereira3, Andrés Páez3, Diego Falceta-Gonçalves2, Merav Opher1

Institution(s): 1. Boston University, 2. Escola de Artes, Ciências e Humanidades, Universidade de São Paulo, 3. Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo

The presence of Kelvin-Helmholtz instability (KHI) in the sheaths of the Coronal Mass Ejection (CME) has motivated several analysis and simulations to test their existence. In the present work we assume the existence of the KHI and propose a method to identify the regions where it is possible the development of KHI for a CME propagating in a fast and slow solar wind. We build functions for the velocities, densities and magnetic fields for two different zones of interaction between the solar wind and a CME. Based on the theory of magnetic KHI proposed by Chandrasekhar (1961) and we found conditions for the existence of KHI in the CME sheaths. Using this method it is possible to determine the range of parameters, in particular CME magnetic fields in which the KHI could exist. We conclude that KHI may exist in the two CME flanks and it is perceived that the zone with boundaries with the slow solar wind is more appropriated for the formation of the KHI.