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A TURBULENCE-DRIVEN MODEL FOR HEATING AND ACCELERATION OF THE FAST WIND IN CORONAL HOLES

2009; IOP Publishing; Volume: 708; Issue: 2 Linguagem: Inglês

10.1088/2041-8205/708/2/l116

2041-8213

Andrea Verdini, M. Velli, W. H. Matthaeus, S. Oughton, P. Dmitruk,

Astro and Planetary Science

A model is presented for generation of fast solar wind in coronal holes, relying on heating that is dominated by turbulent dissipation of MHD fluctuations transported upward in the solar atmosphere. Scale-separated transport equations include large-scale fields, transverse Alfvénic fluctuations, and a small compressive dissipation due to parallel shears near the transition region. The model accounts for proton temperature, density, wind speed, and fluctuation amplitude as observed in remote sensing and in situ satellite data.