Picture Of The Month
The horizontal plasma outflow in the Penumbrae of Sunspots (the Evershed effect) is known for more than 100 Years. However, a radial outflow is not only present within the penumbra, but also in the so-called moat region, surrounding the sunspot. We investigated these flows using spectroscopic HINODE observation. After a wavelength calibration, we obtained the Doppler velocities from the shift of the wing of the solar spectral line of Fe I at 630.15 nm (see Picture 1). In a second step, the velocity signal was extracted along elliptical paths in and around the sunspot, before a sinusoidal...
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