Kelvin-Helmholtz turbulence in the terrestrial magnetopause.

The Kelvin-Helmholtz (KH) instability in its non-linear phase plays a significant role in transporting solar wind plasma into the Earth's magnetosphere. During northward solar wind magnetic field conditions, the flow shear‐induced reconnection generates turbulence at the magnetopause. Specifically, this 3D vortex-induced reconnection serves as the main driver of plasma transport at the dayside flank. In this work, we will report reconnection signatures of KH waves recorded by Magnetospheric Multiscale (MMS) spacecraft during a geomagnetic storm on 14 April 2022 under northward IMF. During this KH interval, MMS encountered a current sheet near an electron diffusion region, accompanied by intense electron jets. This observation is consistent with strong guide-field asymmetric reconnection across the magnetopause. We compare the wave power spectra for KH turbulence with and without reconnecting current sheets and extend the study to characterize the KH turbulence during both storm and non-storm periods.