Effects of Kelvin-Helmholtz-like waves on high-latitude magnetospheric boundary dynamics

On November  27 2021, between 05 and 10 UT, when THEMIS and Cluster were located near the dusk-side low-latitude magnetopause and observed several periods of enhanced  Kelvin-Helmholtz (KH) wave activity, MMS crossed the magnetopause in the southern hemisphere near the dusk-side terminator close to the local time of Cluster. IWF was predominantly southward at the beginning of the interval and was mainly northward after 07:00 UT. This interval coincides with the Earth-flyby of Solar Orbiter, which traversed the nightside magnetosphere and encountered the dusk side tail-flank boundary region. In this presentation, we focus on the MMS observations between 8:15-9:15 UT when MMS encountered flow-shear boundaries between tailward flowing lobe-like plasma and Earthward moving cold dense plasma sheet-like region mixed with hot ions inside the high-latitude magnetosphere. The latter region contains density/temperature fluctuations comparable to KH-like wave disturbance observed at the magnetopause by Cluster during the same interval.  Typically KH disturbances are observed between cold-dense magnetosheath-like plasma and magnetospheric plasma. However, during this interval MMS was located at the boundary between plasma sheet like-hotter plasma and colder lobe-like sparse plasma. We discuss the external and internal interaction processes that may explain these boundary disturbances.  The unique constellation of fleet of spacecraft fleets, covering different magnetospheric boundaries simultaneously enable us to study the effect of the KH-like magnetopause disturbances on the dynamics of the dusk-side magnetosphere in an extended region.