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@article{Blasl:2022:10.5194/egusphere-egu22-3465,
author = {Blasl, KA and Nakamura, T and Plaschke, F and Nakamura, R and Hasegawa, H and Stawarz, JE and Liu, Y-H and Peery, SA and Holmes, JC and Hosner, M and Schmid, D and Roberts, OW and Volwerk, M},
doi = {10.5194/egusphere-egu22-3465},
title = {Multi-scale observations and evolution of the magnetopause Kelvin-Helmholtz waves during southward IMF},
url = {http://dx.doi.org/10.5194/egusphere-egu22-3465},
year = {2022}
}
TY - JOUR
AB - <jats:p><p>The mass and energy transfer across Earth&#8217;s magnetopause is caused by a variety of different plasma processes. One of these processes is the Kelvin-Helmholtz instability (KHI), excited by the velocity shear between the fast-flowing magnetosheath plasma and the relatively stagnant magnetosphere. It has been frequently observed during periods of northward interplanetary magnetic field (IMF), however much less is known about its behaviour during southward IMF conditions.</p><p>We present the first Magnetospheric Multiscale (MMS) observations of KH waves and vortices at the dusk-flank magnetopause during southward IMF conditions on September 23, 2017. The instability criterion for the KHI was fulfilled during this event. The boundary normal vectors, obtained by using multi-point methods, are consistent with the predicted structures of the KH waves. We further performed a series of realistic 2D and 3D fully kinetic PIC simulations based on the plasma parameters observed during this MMS event. A comparison to results from these simulations demonstrated quantitative consistencies with the MMS data in many aspects such as the flow and total pressure variations in the KH waves, and the signatures of the non-linearly rolled up KH vortices including the Low Density Faster Than Sheath (LDFTS) plasma.</p><p>The simulations further showed that secondary instabilities are excited at the edges of the primary KHI. The Rayleigh-Taylor instability (RTI) can lead to the penetration of high-density arms into the magnetospheric side and disturb the structures of the vortex layer, leading to irregular variations of the surface waves. This can be an important factor in explaining the lower observational probability of KH waves during southward IMF than northward IMF. In the non-linear growth stage of the primary KHI, the lower-hybrid drift instabi
AU - Blasl,KA
AU - Nakamura,T
AU - Plaschke,F
AU - Nakamura,R
AU - Hasegawa,H
AU - Stawarz,JE
AU - Liu,Y-H
AU - Peery,SA
AU - Holmes,JC
AU - Hosner,M
AU - Schmid,D
AU - Roberts,OW
AU - Volwerk,M
DO - 10.5194/egusphere-egu22-3465
PY - 2022///
TI - Multi-scale observations and evolution of the magnetopause Kelvin-Helmholtz waves during southward IMF
UR - http://dx.doi.org/10.5194/egusphere-egu22-3465
ER -