Large scale (many minutes to 10 hours) magnetic field structures consisting predominantly of nearly north-south field directions have been discovered in Jupiters's magnetosheath from the data of Voyagers 1 and 2 and Pioneer 10 during their outboard encounter trajectories. The Voyager 2 data, and those of Voyager 1 to a lesser extent, show evidence of a quasi-period of 10 hours (and occasionally 5 hours) for these structures. For all three spacecraft the changes in the field throughout these structures for many tens of hours are approximately restricted to a plane parallel to Jupiter's local magnetopause, according to a variance analysis of the field. Similar directional changes in the field occurred in the inbound magnetosheath for the Voyager spacecraft, but the occurrence was much less frequent, no quasiperiodicity was apparent, and the scale lengths were on average much shorter. The north-south components of the field and plasma velocity are strongly correlated in the outbound magnetosheath as observed by Voyagers 1 and 2, and the components orthogonal to the north-south direction show weak correlations. For both Voyager encounters the sense (positive or negative) of the north-south correlations has been directly related to the direction of the eliptic plane component of the interplanetary magnetic field (IMF) using the field and plasma measurements of the non-encountering spacecraft. Some outbound magnetopause and bow shock crossings, on Voyager 2 especially, are phase locked in system III with some of the large scale magnetosheath field and plasma structures. These structures may be accounted for in terms of field line draping around the magnetopause of the convected IMF and solar wind, where the temporal properties are controlled by the motion and shape of a flattened magnetosphere which, in turn, depend on the rapid rotation of the current sheet within the magnetosphere.