Origin and evolution of MHD turbulence in the solar wind

Summary Solar wind turbulence has both solar and interplanetary sources. Outward travelling waves are generated at the Sun with a spectrum related to the turbulent processes in the solar atmosphere. Instabilities at velocity shears give a local contribution of waves with inward and outward propagation. Nonlinear interactions between the two kinds of waves lead to an energy cascade and to a Kolmogoroff spectrum. To speed up publication, the proofs were not sent to the authors and were supervised by the Scientific Committee.