The SOHO and Cluster missions form a single ESA cornerstone. Yet they observe verydifferentregionsinoursolarsystem: thesolaratmosphereononehandandthe Earth's magnetosphere on the other. At the same time the Ulysses mission provides observations in the third dimension of the heliosphere, and many others add to the picture from the Lagrangian point L1 to the edge of the heliosphere. It was our aim to tie these observations together in addressing the...