  Fast (>700 km/s) and slow (~400 km/s) winds stream from the Sun, permeate the
heliosphere and influence the near-Earth environment. While the fast wind is
known to emanate primarily from polar coronal holes, the source of the slow
wind remains unknown. Here we identify possible sites of origin using a slow
solar wind source map of the entire Sun, which we construct from specially
designed, full- disk observations from the Hinode satellite, and a magnetic
field model. Our map provides a full-Sun observation that combines three key
ingredients for identifying the sources: velocity, plasma composition and
magnetic topology and shows them as solar wind composition plasma outflowing on
open magnetic field lines. The area coverage of the identified sources is large
enough that the sum of their mass contributions can explain a significant
fraction of the mass loss rate of the solar wind.
