Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 689, Issue 1, Pages L69-L72Publisher
IOP PUBLISHING LTD
DOI: 10.1086/595744
Keywords
magnetic fields; sunspots
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Funding
- Marianne and Marcus Wallenberg Foundation
- European Community's Sixth Framework Programme [MEST-CT-2005-020395]
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We discuss penumbral fine structure in a small part of a pore, observed with the CRISP imaging spectropolarimeter at the Swedish 1-m Solar Telescope (SST), close to its diffraction limit of 0.16 ''. Milne-Eddington inversions applied to these Stokes data reveal large variations of field strength and inclination angle over dark-cored penumbral intrusions and a dark-cored light bridge. The mid-outer part of this penumbra structure shows similar to 0.3 '' wide spines, separated by similar to 1.6 '' (1200 km) and associated with 30 degrees inclination variations. Between these spines, there are no small-scale magnetic structures that easily can be identified with individual flux tubes. A structure with nearly 10 degrees more vertical and weaker magnetic field is seen midway between two spines. This structure is cospatial with the brightest penumbral filament, possibly indicating the location of a convective upflow from below.
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