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Paper: The Velocity Field in and around Sunspots. Results from 2D-Spectroscopy
Volume: 118, First Advances in Solar Physics Euroconference: Advances in the Physics of Sunspots
Page: 111
Authors: Balthasar, H.; Schleicher, H.
Abstract: A sunspot was observed on June 11, 1995 with the Gottingen 2D-spectrometer at the Vacuum Tower Telescope on Tenerife using the line Fe 709 nm. The data show an radial outflow of 500 m/s outside the penumbra for about 15000 km. This flow is separated from the Evershed flow of 1.6 km/s by a sharp decrease at the boundary of the visible penumbra. The Evershed flow is associated to dark penumbral filaments, but we do not find a correlation between intensities and line asymmetries. No relation between the power distribution and the filaments is found for the 5 minute oscillations. Small spots and pores in the vicinity of the main spot show 3 minute oscillations.
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