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We examine the flux structures defined by NS-NS superpotentials of Type IIAand Type IIB string theories compactified on a particular class of internalspaces which include non-geometric flux contributions due to T duality ormirror symmetry. This is then extended to the Type IIB R-R sector through theuse of S duality and then finally to its mirror dual Type IIA R-R sector, withnote of how this sector breaks S duality invariance in Type IIA. The nilpotencyand tadpole constraints associated with the fluxes induced by both dualitiesare derived, explicitly demonstrated to be mirror invariant and classified interms of S duality multiplets. These results are then used to motivate thepostulation of an additional symmetry for internal spaces which are their ownmirror duals and an analysis is done of the resultant constraints for such aconstruction.

The Generalised Geometry of Type II Non-Geometric Fluxes Under T and S Dualities