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Alfv\ en Speed Transition Zone in the Solar Corona
The Alfv\ en radius, r$_A$, at which solar wind radial outflow speed exceeds the Alfv\ en wave speed, is an important parameter in understanding solar wind evolution in the extended corona. The mean solar wind angular momentum scales with $r_A^2$ in the axisymmetric steady-state approximation, so the Alfv\ en radius is often referenced in the study of solar wind corotation and dynamics. Alfv\ en wave speed is derived from the magnetic-field intensity and plasma mass density. In the inner coronal regions, these parameters wer ...
Wexler, David; Stevens, Michael; Case, Anthony; Song, Paul;
Published by: \apjl Published on: oct
YEAR: 2021   DOI: 10.3847/2041-8213/ac25fa