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- W2123362024 endingPage "124" @default.
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- W2123362024 abstract "We present direct numerical simulations of inhomogeneous reduced magnetohydrodynamic (RMHD) turbulence between the Sun and the Alfven critical point. These are the first such simulations that take into account the solar-wind outflow velocity and the radial inhomogeneity of the background solar wind without approximating the nonlinear terms in the governing equations. RMHD turbulence is driven by outward-propagating Alfven waves (z + fluctuations) launched from the Sun, which undergo partial non-WKB reflection to produce sunward-propagating Alfven waves (z – fluctuations). We present 10 simulations with different values of the correlation time and perpendicular correlation length L ⊥☉ of outward-propagating Alfven waves at the coronal base. We find that between 15% and 33% of the z + energy launched into the corona dissipates between the coronal base and Alfven critical point. Between 33% and 40% of this input energy goes into work on the solar-wind outflow, and between 22% and 36% escapes as z + fluctuations through the simulation boundary at r = r A. The z ± power spectra scale like , where k ⊥ is the wavenumber in the plane perpendicular to B 0. In our simulation with the smallest value of (~2 minutes) and largest value of L ⊥☉ (2 × 104 km), we find that α+ decreases approximately linearly with increasing ln (r), reaching a value of 1.3 at r = 11.1 R ☉. Our simulations with larger values of exhibit alignment between the contours of constant +, –, , and , where ± are the Elsasser potentials and are the outer-scale parallel Elsasser vorticities." @default.
- W2123362024 created "2016-06-24" @default.
- W2123362024 creator A5004002494 @default.
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- W2123362024 date "2013-10-07" @default.
- W2123362024 modified "2023-10-12" @default.
- W2123362024 title "DIRECT NUMERICAL SIMULATIONS OF REFLECTION-DRIVEN, REDUCED MAGNETOHYDRODYNAMIC TURBULENCE FROM THE SUN TO THE ALFVÉN CRITICAL POINT" @default.
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- W2123362024 doi "https://doi.org/10.1088/0004-637x/776/2/124" @default.
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