Supersonic Continuation of the Evershed Flow Outside a Sunspot as Observed with Hinode
We report on the discovery of mostly horizontal field channels just outside sunspot penumbrae (in the so-called "moat" region) that are seen to sustain supersonic flows (line-of-sight component of 6 km s-1). The spectral signature of these supersonic flows corresponds to circular polarization profiles with an additional, satellite, third lobe of
Martínez Pillet, V. et al.
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2009