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 Alfve ́nic 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.
A Turbulence-Driven Model for Heating and Acceleration of the Fast Wind in Coronal Holes / A. Verdini; M. Velli; W. Matthaeus; S. Oughton; P. Dmitruk. - In: THE ASTROPHYSICAL JOURNAL LETTERS. - ISSN 2041-8205. - STAMPA. - 708:(2010), pp. L116-L120. [10.1088/2041-8205/708/2/L116]
A Turbulence-Driven Model for Heating and Acceleration of the Fast Wind in Coronal Holes
VERDINI, ANDREA;VELLI, MARCO;
2010
Abstract
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 Alfve ́nic 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.
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