Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984acaps...4...33h&link_type=abstract
(Acta Astrophysica Sinica, vol. 4, no. 1, 3, 1984, p. 33-42) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 8, Sept.
Astronomy and Astrophysics
Astrophysics
Magnetohydrodynamic Flow, Plasma Dynamics, Solar Atmosphere, Solar Magnetic Field, Sunspots, Chromosphere, Magnetohydrodynamic Stability, Photosphere, Plasma Equilibrium, Radial Velocity, Solar Prominences
Scientific paper
The paper gives a theoretical analysis of the overall characteristics of the Evershed flow (one of the main features of sunspots), with particular attention given to its outward flow from the umbra in the photosphere, reaching a maximum somewhere in the penumbra, and decreasing rapidly further out, and its inward flow of a comparable magnitude in chromosphere. Because the inertial force of the flow is small, the relevant dynamic process can be divided into a base state and a perturbation. The base-state solution yields the equilibrium relations between the pressure gradient, the Lorentz force, and gravity, and the flow law. The perturbation describes the force driving the Evershed flow. Since the pressure gradient in the base state is already in equilibrium with the Lorentz force and the gravity, the driving force of the mean Evershed flow is small.
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