Resulting conditions near the top of the simulation domain (i.e. at the base of the solar wind). Top left: location of the open magnetic field lines at the photosphere (traced down from Z = 12 Mm), with the convection pattern shown bellow. Bottom left: open magnetic field at Z = 12 Mm coloured by their photospheric field strength. Top middle and right: density and temperature variation with respect to the horizontal average at Z = 12 Mm. Bottom middle: mass flux at Z = 12 Mm. Bottom right: transverse wave-energy-flux at Z = 12 Mm. Each panel is taken at t = 40 min. The contrast in density, temperature and upward wave-energy is evident, resulting from the different MC field strengths at the base of the braided magnetic field structures.