Stokes inversions show the Evershed flow reverses to inflow in the upper photosphere while the moat flow remains an outflow, and umbral flashes exhibit supersonic upflows with Mach numbers at least 1.5 consistent with shock fronts.
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Chromospheric and photospheric properties of sunspots as inferred from Stokes inversions under magneto-hydrostatic and non-local-thermodynamic equilibrium
Stokes inversions show the Evershed flow reverses to inflow in the upper photosphere while the moat flow remains an outflow, and umbral flashes exhibit supersonic upflows with Mach numbers at least 1.5 consistent with shock fronts.