Cluster and Ground-Based Observations of Flux Transfer Events During the 10,000 km Separation Season

Between 1920 and 1950~UT on 27th January 2006, the Cluster spacecraft straddled the dayside magnetopause slightly equatorward of the cusp in the post-noon sector. The spacecraft formed a tetrahedron with a scale length of 10,000~km. The lagged IMF was largely directed sunward, but with weak and approximately equal duskward and southward components. A series of flux transfer events (FTEs) were observed by differing subsets of the Cluster spacecraft, three of which were observed by all four spacecraft. Multi-spacecraft timing analysis indicates that these FTEs moved predominantly latitudinally, but their observation at all four spacecraft indicates that these three FTEs extend longitudinally for at least 10,000~km. Simultaneously, pulsed ionospheric flows (PIFs) were observed, although there is no clear one-to-one correlation between the PIFs and the FTEs. We present in situ observations, along with attempts to quantify the flux reconnected during this interval using ground-based observations.