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Paper: The Evershed Effect with 0.″2 Angular Resolution
Volume: 358, Solar Polarization 4
Page: 96
Authors: Marquez, I.; Bonet, J.A.; Sanchez Almeida, J.; Dominguez Cerdena I.
Abstract: We present a preliminary analysis of penumbral spectra observed with unprecedented angular resolution (0.″2) using the new Swedish 1-m Solar Telescope. The use of a non-magnetic line allows us to measure Doppler shifts without magnetic contamination. The observed Doppler shifts depend on the part of the line used for measuring, indicating that the velocity structure of penumbrae remains unresolved even with our resolution. We find a correlation between upflows and bright filaments. This association is not specific of the outer penumbra but it also occurs in the inner penumbra. The existence of such correlation was originally reported by Beckers & Schröter (1969), and it is suggestive of energy transport by convection in penumbrae.
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