Solar pores
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Small-scale dark lanes in active regions (2/2)
GREGOR
Active region 11768 was observed on 13 June 2013 with the Broad Band Imager at the German 1.5 m GREGOR telescope (Observatorio del Teide, Spain). The image was speckle reconstructed from a burst of 100 frames taken within 20 seconds. In order to freeze the seeing, each image was exposed for 1 millisecond. During the measurements, the GREGOR adaptive optics system was locked on the pores to partially correct for seeing effects and for the static aberrations of the optical train. The reconstructed image has a resolution of 60 kilometers on the surface of the Sun.
Dark lanes very prominently outline the bright features observed in the dark area of the central pore. This and other images from GREGOR indicate that bright dots and bright features are always associated with dark lanes and that adjacent bright features are connected by such dark lanes. The width of the dark lanes can be 60 kilometers or smaller. Dark lanes do not only occur as central lanes in light bridges of pores, they are also seen as narrow dark intergranular lanes, as striations at the boundary of pores and granules, and as dark cores of filaments intruding into the pore.
Image credit: Rolf Schlichenmaier (KIS)
Publication: Schlichenmaier et al. 2016, A&A, 596, A7